Motor Plants
crankshaft counterweight
Component 'U' of the diesel engine shown in the illustration is called the ____. Illustration MO-0122
Pressure in the cylinder decreases.
In the pressure-volume diagram, shown in the illustration, what occurs between points "e" and "f"? Illustration MO-0035
open the exhaust valves and operate the unit injectors
The diesel engine rocker arms shown in the illustration serve to _____. Illustration MO-0122
Check the pump rack setting.
The diesel engine shown in the illustration can be fitted with a pyrometer at each exhaust elbow. If one of the cylinder pyrometers is reading significantly higher than the others, which of the following should be your FIRST action? Illustration MO-0005
E
The diesel engine shown in the illustration has the highest fuel pressure developed in the part labeled _____. Illustration MO-0003
provide scavenge air pressure at low load
The diesel engine shown in the illustration, is provided with an auxiliary blower to _____. Illustration MO-0003
U
The diesel engine shown in the illustration, the exhaust manifold is indicated by the letter ____. Illustration MO-0003
W
The diesel engine shown in the illustration, which of the lettered parts listed is cooled by sea water? Illustration MO-0003
M'
The diesel engine water inlet jumper illustrated is represented by the letter or number ____. Illustration MO-0122
7'
The diesel engine wrist pin in the illustration is indicated by the component labeled ____. Illustration MO-0122
measuring the cold valve clearance between components "C" and "D"
When inspecting the valve mechanism shown in the illustration, normal maintenance would include ____. Illustration MO-0074
Once the bearing cap is properly torqued, measure the end gap dimensions to ascertain even tightening of the cap.
When installing the bearing cap on the device shown in the illustration, which of the precautions listed must be observed? Illustration MO-0121
After air in the cylinder is compressed.
When is fuel injected into a cylinder of diesel engines?
K
Which area of the indicator diagram illustrated, indicates the afterburning period in a diesel engine cylinder? Illustration MO-0033
J
Which area of the indicator diagram illustrated, indicates the ignition delay period in a diesel engine cylinder? Illustration MO-0033
"26"
Which device is used to prevent overpressurization of the illustrated distiller? Illustration MO-0111
Specific gravity of the fuel.
Which factor determines the size of the ring dam for a fuel oil centrifugal purifier?
Compressed air
Which internal combustion engine starting system uses a vane type fluid motor?
"V"
Which letter represents the exhaust gas exit point for the diesel engine shown in the illustration? Illustration MO-0122
P
Which letter represents the scavenging air system non-return valve in the illustration? Illustration MO-0003
A'
Which letter represents the top deck (valve) cover of the engine shown in the illustration? Illustration MO-0122
Inhibitors
Which lubricating oil additive is used in a diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?
Turbocharged
Which of the air intake systems listed will result in the lowest specific fuel consumption?
Precision insert
Which of the bearings listed below is most widely used for the main and connecting rod bearings of a modern high-speed diesel engine?
A
Which of the combustion chambers shown in the illustration is referred to as an "energy cell" used in some small diesel engines? Illustration MO-0068
Upper and lower crankshafts
Which of the components listed is only found in an opposed-piston engine?
Blower timing gears
Which of the designs listed will keep the lobes from making contact in a Roots-type blower?
A dry-type exhaust muffler
Which of the diesel engine exhaust mufflers listed is usually equipped with a spark arrestor?
Failure to properly tighten the bolts of the condenser heat exchanger.
Which of the following conditions can cause high salinity of the distillate due to sea water leakage in the illustrated device? Illustration MO-0110
Starting motor will dangerously overspeed
Which of the following conditions is most likely to occur if the electric starter motor pinion gear fails to disengage from the flywheel of a diesel engine after the engine has started?
The vapors produced in section "G" are condensed and the non-condensable gases are removed.
Which of the following conditions occurs in the section labeled "F" of the device shown in the illustration? Illustration MO-0110
Excessive propeller cavitation
Which of the following conditions will cause the engine to operate in area "A" of the diagram shown in the illustration? Illustration MO-0126
Operating with minimal hull drag and under light draft
Which of the following conditions would NOT be considered a valid reason for the diesel engine to operate in the area indicated by letter "B" shown in the illustration? Illustration MO-0126
Pressure relief bypass line around the filter
Which of the following devices is normally provided to prevent oil starvation in a diesel engine lubrication system utilizing the 'full flow' principle?
The engine will crank slowly and may fail to start.
Which of the following effects will excessively cold lube oil have on the operation of a diesel engine?
It supplies the operating medium used in the removal of the distillate.
Which of the following is NOT a function of the water supply through item "P" shown in the illustration? Illustration MO-0110
Helps absorb the shock when the pinion engages the flywheel ring gear.
Which of the following operating characteristics of the Bendix drive friction clutch is associated with a Bendix drive starter?
All of the above are correct.
Which of the following precautions should be taken prior to starting the separator shown in the illustration? Illustration MO-0127
with the engine stopped, cover the air inlet after removing the filter.
Which of the following precautions should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?
Crankcase explosion
Which of the following problems could develop due to the accumulation of oil vapors in the crankcase of a diesel engine?
Engine speed should be reduced.
Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one cylinder secured?
Relief of excessively high-pressure gases from the cylinder.
Which of the following processes is indicated by the flow arrows shown in the illustration? Illustration MO-0026
Higher compression ratios create higher temperature.
Which of the following relationships exist between the temperature developed in a combustion space, and the compression ratio of the engine?
"B" is the camshaft and its rpm will match that of the flywheel.
Which of the following represents the diesel engine camshaft shown in the illustration and its relative rotating speed? Illustration MO-0122
Crankcase oil level
Which of the following should always be checked prior to starting a diesel engine?
the centrifuge disc stack
Which of the following statements describes "N" shown in the illustration? Illustration MO-0112
Seventy-five percent of the feedwater entering the unit is removed as brine.
Which of the following statements describes the approximate relation between the feedwater entering the unit shown in the illustration and brine being removed? Illustration MO-0111
The output from "2" is equal to the input to "1" except when the input of "1" is between the setpoints of '17A' and '17B', when it will remain at the value of '17A'.
Which of the following statements describes the operation of the circuit shown in the illustration? Illustration MO-0114
The bowl will fail to close when starting and the unit will not shoot when operating.
Which of the following statements describes what will occur if the annular spaces, indicated by the letter "K" of the device shown in the illustration, became restricted? Illustration MO-0112
The volume is greatly reduced, contributing to condensation within the condenser.
Which of the following statements describes what will occur to the volume of water vapor as it is exposed to the lower temperatures existing in the device labeled "24" shown in the illustration? Illustration MO-0111
The detector mechanism consists of an armature suspected on a flexure pivot and restrained from motion by a permanent magnet acting through a small air gap.
Which of the following statements is accurate concerning the vibration sensing device used with the separator shown in the illustration? Illustration MO-0127
At full load the intake manifold pressure is greater than the exhaust manifold pressure.
Which of the following statements is correct regarding a turbocharged four-stroke cycle diesel-generator?
The oil pressure is greater than the cooling water pressure.
Which of the following statements is true concerning a main diesel engine oil cooler?
The air starting valve is opened by cam action.
Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustration? Illustration MO-0046
Ignition lag is reduced with fuels having a high cetane number
Which of the following statements is true concerning the cetane number of diesel fuel?
The pump supplies the motive fluid to the ejectors in addition to supplying the feedwater to the distiller.
Which of the following statements represents the two major functions provided by the item labeled "20" shown in the illustration? Illustration MO-0111
The probe and sensor measure the dielectric constant through capacitive reactance of the process fluid.
Which of the following statements represents the working principle of the water transducer used with the separator shown in the illustration? Illustration MO-0127
Cold valve clearance is measured between components "C" and "D".
Which of the following statements would apply when checking the valve clearance of the unit shown in the illustration? Illustration MO-0074
An extremely high neutralization number.
Which of the following test indicators should be considered the most significant factor in determining as to whether or not a diesel-generator's lube oil should be drained and renewed?
Pintle
Which of the fuel nozzles listed requires the LEAST maintenance?
A
Which of the indicator diagrams illustrated depicts the condition that should be corrected by retarding only the timing? Illustration MO-0029
D
Which of the indicator diagrams illustrated indicates the condition that should be corrected by retarding the timing, and the fitting of thicker shims to the connecting rod? Illustration MO-0029
A
Which of the labeled figured illustrated, represents the correct alignment mark relationships of a properly reassembled centrifuge bowl? Illustration MO-0022
Lube oil entering the air intake manifold.
Which of the listed conditions will result in the failure of an auxiliary diesel engine to shut down?
The engine cylinder head is fitted with replaceable valve seats.
Which of the listed cylinder head design features is shown in the illustration? Illustration MO-0013
Piston rod and crosshead construction
Which of the listed design features is most common with a two-stroke cycle, low-speed main propulsion diesel engine?
Electric
Which of the listed diesel engine starting systems is most susceptible to difficulties in cold weather?
the efficiency of fuel combustion
Turbulence of the compressed air charge in a diesel engine cylinder increases _____.
quality of the oil
Two important considerations for the proper lubrication of a diesel engine include, the delivery of the oil in sufficient amount, and the _______.
reduce the opportunity for the formation of sulfuric acid in the cylinder bore exhaust passages
Using a cooling water temperature of 225 degrees F (107.2 degrees C), instead of 180 degrees F (82.2 degrees C) in an auxiliary diesel engine, will _____.
0.892 kg/dm3
Using the graph shown in the illustration, the oil being separated has a specific gravity of .87 kg/dm3 at 72.5 degrees C. What will be the specific gravity if the temperature is lowered to 40 degrees C? Illustration MO-0113
facilitate valve removal for servicing
Valve cages are used on some large diesel engine to ____.
Method of air charging a cylinder and expelling exhaust gases
What determines the number of events occurring in a cycle of operation in an internal combustion engine?
the pressure to be bled prior to opening the compartment cover
When cleaning a duplex strainer, it is important for ______.
a change in the oils viscosity
A 'Blotter test' is a test performed on the lube oil of a diesel engine which can determine _______.
having the flywheel impart a torque to the starter pinion
A Bendix drive starting motor disengages the drive gear from the flywheel by _____.
diluted with fuel oil
A decrease in the flash point of diesel engine lube oil indicates the lube oil has become ______.
removes combustible gases
A diesel engine crankcase ventilation system ____.
formed by the connecting rod and the cylinder centerline
During the power stroke, the side thrust of a trunk type piston is a result of the angle ______.
10 cubic inches
A diesel engine cylinder has a swept volume of 125 cubic inches and a compression ratio of 13.5 to 1. What is the clearance volume in the cylinder at top dead center?
restricted cooling passages
A diesel engine cylinder head can crack as a result of _____.
worn valve guides
Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by _____.
engine overload
A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and the speed remaining below normal. The probable cause is _____.
a high viscosity index
A diesel engine exposed to widely varying ambient temperatures should use a lubricating oil with _______.
17.6 kg/cm2
A diesel engine indicator diagram has an area of 22 cm2 and a length of 12.5 cm. If the scale of the indicator spring is 1 mm = 1 kg/cm2, what is the cylinder mean effective pressure?
air intake is restricted
A diesel engine may be hard to start if the ____.
insufficient compression
A diesel engine may fail to start when being cranked, due to ____.
Failure to reset the overspeed tirp
A diesel engine operates erratically, overspeeds, and fails to restart when cranked at normal speed. Which of the following problems is the most likely cause for the engine failing to restart?
higher
A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is _____.
Detergent oil
A diesel engine should use which type of lubricating oil?
opposed-piston engine
A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an _____.
3.33 to 1
A diesel engine with a full speed of 1000 RPM drives a propeller at 300 RPM. What is the speed reduction ratio?
carefully check for binding in the governor linkage
A diesel-generator governor is hunting. After changing the oil, the governor is flushed and the compensation needle value is adjusted, but the hunting persists. You should NOW _____.
3416 kW
A four cylinder, four stroke/cycle, single acting diesel engine has a 740 mm bore and a 1500 mm stroke. What indicated power will be developed if the average mean effective pressure is 18 kg/cm2 at a speed of 90 RPM?
excessive air leakage by rings and valves
A four-stroke cycle main propulsion diesel engine fails to start at normal cranking speed with normal fuel pressure and ambient temperature. The reason for the failure could be _____.
scavenging air
A large, low-speed, main propulsion diesel engine uses sea water to directly cool the ___.
Length of the piston skirt
A loop or cross scavenged engine utilizes the motion of its pistons and a turbocharger to provide scavenging air. Which of the listed mechanical designs prevents the air under the pistons from being pumped back through the scavenge ports during the piston power stroke?
ferrous materials
A magnetic strainer is primarily used in diesel engine reduction gear oil systems to remove small particles of _______.
securing the fuel supply
A main propulsion diesel engine is normally shutdown by ______.
cetane number of 45
A mixture of 45% cetane and 55% alpha-methyl-naphthalene is found to have the same ignition delay as a sample of diesel oil. The sample can be described as having a/an ____.
slightly less than atmospheric pressure
A naturally aspirated diesel engine at full throttle will have an intake manifold pressure ______.
securing the fuel supply
A normally operating diesel engine is shutdown by _____.
Device 17A needs to be replaced, repaired, or reset to the setpoint coinciding with the RPM value for the low end of the critical speed range.
A propulsion engine, using the speed control circuit shown in the illustration , fails to function at speeds lower than the low end of the critical speed range. Which of the following statements describes what should be done to correct this malfunction? Illustration MO-0114
spring-loaded pressure plate
A safety crankcase cover differs from other diesel engine access doors in that it is fitted with a _____.
7,455 mbhp
A six cylinder, two stroke/cycle diesel engine is 83% efficient and has a cylinder constant of 0.998 while operating with a mean effective pressure of 15 kg/cm2 at a speed of 100 RPM. What is the metric brake horse power developed?
one-half engine speed
A six-cylinder, four-stroke cycle diesel engine is fitted with a rotary distributor type air starting system. The speed of the rotating distributor disc is ______.
bypass the filter should it become clogged
A spring-loaded relief valve is located on some lube oil filters in full flow systems to ________.
around the cooler
A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water _____.
operates without energy absorbing intake and exhaust strokes
A two-stoke cycle diesel engine requires less starting air than a four-stroke cycle diesel engine, of equal displacement, because the two-stroke cycle diesel engine _______.
reduce heat radiation to the engine room
A water jacket is placed around the exhaust manifolds of propulsion diesel engines to ____.
highly polished
A well-lubricated bearing surface always appears _______.
I
According to the illustration, fuel cutoff timing in the cylinder is controlled with the component that is identified as the letter __. Illustration MO-0097
I
According to the illustration, fuel delivery to the cylinder is terminated and controlled with the component that is identified as the letter ____. Illustration MO-0097
C
According to the illustration, initial timing of fuel injection into the cylinder is controlled with the component that is identified as the letter ____. MO-0097
normal operating temperature without a load
Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at ______.
breaking of the rings, ring lands, or both during piston removal
After a long period of operation, a wear ridge, caused by piston ring action, will develop near the top of the cylinder liner. This ridge must be removed during maintenance in order to prevent _____.
It is possible for the shaft to move axially 2.3 mm during astern operation and relates to an excess movement of 1.3 mm, 0.3 mm beyond the maximum worn play.
After following the prescribed procedures to measure the thrust bearing clearance shown in the illustration, the distance "F" is determined to be 200 mm, and 'f1' is 2.3 mm. Which of the following statements describes the condition indicated by these dimensions? Illustration MO-121
Disassemble the entire unit, clean all components, replace any defective gaskets and use the proper lubricants where required.
After removing the bowl hood of the device shown in the illustration, excessive quantities of sludge are visible. Which of the following statements represents the approach to rectify the situation? Illustration MO-0112
higher torque and higher brake horsepower
Aftercooling of a turbocharged diesel engine will result in ____.
loosening the compression nuts at the injectors
Air is normally bled from a diesel engine fuel system by _____.
vane motors
Air motors used for starting some auxiliary diesel engines are generally the type known as a/an _____.
all of the above
Al oil-operated direct reversing mechanism on a large, low-speed, main propulsion diesel engine, can serve to ______.
shut off the oil feed to the separator
All alarms occurring on the control unit of the device shown in the illustration will _____. Illustration MO-0127
pump and the starting motor
An accumulator used in a hydraulic starting system is generally located between the _____.
block the flow of air supply to the engine
An auxiliary diesel-generator continues to run after you try and shut down. Your next course of action should be to ______.
9,111 kW
An eight cylinder, four stroke/cycle, single acting diesel engine has a 650 mm bore and a 1400 mm stroke. What will be the developed indicated metric horsepower if the average mean effective pressure is 30 kg/cm2 at a speed if 100 RPM?
serious fire hazard
An immediate repair is required if a leak occurs in the high-pressure fuel piping between the injection pump and fuel nozzle because of the ______.
decrease in fuel consumption per horsepower-hour
An increase in the air inlet manifold pressure of a diesel engine will result in a/an ______.
relationships between pressure and volume during one cycle of the engine
An indicator card or pressure-volume diagram, shows graphically the _____.
cylinder air starting check valves
During the starting of a diesel engine, compression gases are prevent from backing into the air starting system, shown in the illustration, by the ______. Illustration MO-0046
effective cylinder scavenging and cooling
During the valve overlap period, the exhaust pressure of a turbocharged, four-stroke cycle diesel engine must be less than the intake manifold pressure to ensure _____.
cracked cylinder head
Combustion gas venting through the expansion tank can be caused by a _____.
a cylinder air charge of higher pressure
Compared to a naturally aspirated diesel engine, a supercharged diesel engine has ______.
increase peak power output
Cooling the intake air supplied to a diesel engine will ___.
straight impeller vane with concentric housing
Cooling water pumps driven by direct reversing diesel engines are usually _____.
sulfur
Corrosion and grooving on the blading of an exhaust driven turbocharger is caused by certain components of residual fuel oils. These components are vanadium, sodium, and ______.
worn main bearing journals
Crank web deflection readings will give a positive indication of _____.
the ignition of unburned fuel and air in the crankcase
Crankcase explosions in propulsion diesel engines result from ______.
earlier and remain open longer
Decreasing the exhaust valve clearance of a diesel engine will cause the exhaust valve to open _____.
regulate maximum vacuum during normal operation
Device "27" shown in the illustration is used to ____. Illustration MO-0111
fuel manifold
Device 'E' shown in the illustration is known as the ____. Illustration MO-122
Lube oil sump level
Diesel engine automated control systems may utilize sensing devices of dual function with sensing ranges providing both alarm and engine shut down capability. Which of the key points listed would only require an alarm sensor?
only after the engine room control station is switched to 'bridge control'
Diesel engine control can be obtained by the bridge _____.
higher compression pressures
Diesel engine electric starting motors generally require heavier duty motors and operate at higher voltages than comparable starting motors for gasoline engines due to ______.
performance
Diesel engine exhaust gas temperatures can be used to determine individual cylinder ____.
means of heating the feedwater
Diesel engine jacket water is used in the fresh water distillation process as the ____.
burn fuel in a closed chamber which imparts linear motion to pistons
Diesel engines are classified as reciprocating internal combustion engines because they ____.
compensation
Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as _____.
variable speed governor
Direct reversible main propulsion diesel engines would normally be fitted with a/an ______.
Not more than 30 seconds
For a diesel engine, approximately how long can an electric starter motor be operated continuously before damage may begin to occur due to overheating?
An increase in compression ratio will decrease the ignition lag.
For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?
oil spray
For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an ______.
throughput
For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable ____.
piston thrust washer
The diesel engine component labeled "5", shown in the illustration is known as the _____. Illustration MO-0122
The sea water used for condensing the water vapor.
For the operation of the illustrated device, what fluid flow would be expected at the connection labeled "I"? Illustration MO-0110
the spring force and cylinder pressure
In a direct cylinder admission air starting system, once the engine begins to fire, the air starting check valve illustrated, is closed by ______. Illustration MO-0107
against the crosshead during the power and compression strokes
In a large slow-speed propulsion diesel engine, the force applied to the piston is _____.
the angularity of the connecting rod against the crosshead during the power stroke
In a large slow-speed propulsion diesel engine, the side thrust on the crosshead is the direct result of _____.
Tie rod
In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?
cylinders are not chilled by the expansion of the starting air
In a medium-speed marine propulsion engine equipped with direct admission air starting valves, the cylinders without air starting valves fire first because the ______ .
displacement
In a naturally aspirated diesel engine, the volume of air intake is directly associated with engine _____.
combustion by-products removed from the cylinder walls
In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the ________.
spring-loaded piston accumulator
In a simple hydraulic governor with speed droop, oil under pressure is maintained ready for use in the _____.
rotating impeller vanes
In a turbocharger, inlet air velocity is increased in the _____.
gear drive by the engine
In a two-stroke cycle diesel engine, a Roots-type blower is usually _____.
an overheated starting air supply pipe
On a diesel engine with direct-cylinder admission air starting, a leaking air starting valve would be indicated by ______.
pressure feed
On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by _______.
allow the exhaust ports to open and close before the inlet ports close
In a two-stroke cycle, opposed-piston, diesel engine, one crankshaft operates several crank angles in advance of the other crankshaft to _____.
accurate metering of the fuel oil
In a unit injector, an upper helix and lower helix are machined in the lower part of the plunger for ____.
supply a backup source of starting air
In addition to the main starting air compressor, another air compressor, driven by a separate power source, is installed to ______.
improve skirt lubrication
In an auxiliary diesel engine, one reason for knurling the piston skirt is to _____.
The sequence of events that produce a power pulse.
In describing engine operation, what does the term "cycle" mean?
straight reciprocation
In diesel engines designed with a crosshead, the motion of the piston rod can be described as _____.
starting air and fuel pumps
In order to reverse the rotation of a two-stoke cycle loop scavenged, direction reversing, propulsion diesel engine, the cam positions must be charged for the ______.
fork and blade
The diesel engine connecting rods shown in the illustration are distinctively named _____. Illustration MO-0122
cylinder pressure without injection
On the cylinder indicator diagram illustrated, the dotted line indicated as 'L' is describing the _____. Illustration MO-0033
H
On the cylinder indicator diagram illustrated, the maximum rise in pressure occurs during the period labeled as _____. Illustration MO-0033
a bypass valve
Injection pressure in a common rail fuel system is controlled by ____.
lube oil carbonization
Intercoolers installed on starting air compressors, reduce the possibility of _______.
top dead center
On the indicator card shown in the illustration, lines 'A' and 'B' indicate ____. Illustration MO-0108
feeler gage
Misalignment of the drive shaft and propeller shaft flanges can be detected by using a dial indicator or ______.
a combination of constant volume and constant pressure
Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion cycle which is _____.
ensure a positive flow of oil at all times
Most large main propulsion diesel engines use a duplex lube oil strainer to ______.
begins on a constant volume basis
Most practical diesel engines today operate on a cycle which is a combination of the Diesel and Otto cycles. In this process, compression ignition ______.
Admission of reversing start air
During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to changing the engine rotation for a vessel with moderate headway?
directly forcing the sliding piston upward to keep the bowl closed
During normal operation, the liquid retained in space 'J' of the device shown in the illustration is ____. Illustration MO-0112
"21"
During operation which device listed removes air and non-condensable gases from the unit shown in the illustration? Illustration MO-0111
ignition quality of the fuel oil
One cause of diesel engine fuel ignition delay is _____.
exhaust temperature
One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the _____.
The solenoid valve is closed and the bypass valve is closed.
During the normal operation of the centrifuge shown in the illustration, the operating liquid solenoid and bypass valves for the cleaning cycle should be in which position? Illustration MO-0112
may cause frothing
Antifreeze solutions containing ethylene glycol should not be mixed with corrosion protection oils, as the resultant mixture ____.
165 degrees to 180 degrees F
As a general rule, what would be the recommended operating water jacket outlet temperature range for medium-speed marine diesels setup with closed treated fresh water cooling systems and fitted with vented expansion tanks?
Air/Fuel ratio
As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease?
Final heaters.
As shown in the illustration, the viscosimeter would be used to directly control the output of which of the following components? Illustration MO-0077
Throughput too low
As shown in the illustration, which of the following conditions would be responsible for a "low-pressure in oil outlet" alarm to be indicated? Illustration MO-0127
right hand end of the floating lever will move up
As the load is being decreased on the engine controlled by the governor shown in the illustration, the _____. Illustration MO-0092
battery power direct current
Auxiliary diesel engine electric starting motors use ________.
low lube oil pressure
Auxiliary diesel engines an be automatically shut down as a result of ______.
replacing the plunger and the barrel
Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires _____.
bleed off all hydraulic pressure from the system
Before any auxiliary diesel engine hydraulic starting system is opened for servicing or repair, you must _____.
prevent damage from localized overheating
Before being shut down, a diesel engine should idle a few minutes in order to _____.
pressurize the lube oil system with the prelube pump
Before starting a diesel engine that has an engine driven lube oil pump, the operator should _____.
the crown being tapered and smaller than the skirt
Cast iron pistons used in large propulsion diesel engines are constructed with _____.
during the valve overlap period
Clearance volume scavenging un a turbocharged, four-stroke cycle diesel engine is accomplished _____.
high exhaust temperatures
Clogged or partially obstructed exhaust ports on a diesel engine can cause _____.
will carry a 100% overload for a brief period
Electric starting motors for diesel engines require high current for operation and ______.
has a lower freezing point and higher boiling point
Ethylene glycol, when used as a coolant in a closed cooling system for a diesel engine, is more advantageous than untreated raw water because it ____.
the continuous action of ejector "22"
Excess brine accumulated in the distiller, shown in the illustration, is removed during normal operation by ____. Illustration MO-0111
gas driven turbocharger because it has a wide speed range, high operating temperatures and close tolerances.
Excessive mechanical and pulsating vibrations developed in a main propulsion diesel engine may be more likely to cause damage to an attached ______.
hammer the piston land below the ring
Excessive side clearance between a piston ring and its groove will cause the ring to _____.
5
Excluding line losses, how many distinct pressure drops will occur as sea water flows through all the heat exchangers in the cooling system shown in the illustration? Illustration MO-0111
they are arranged to prevent gas backflow to each engine
Exhaust pipes for separate main propulsion diesel engines can be combined only when _____.
neglecting to close the vent shell
Failure to establish sufficient vacuum when starting up the unit shown in the illustration may be the result of ______. Illustration MO-0110
110 mm
From the graph shown in the illustration, determine the size of the regulating ring required for the proper operation of the fuel oil centrifuge if the fuel oil specific gravity is 0.9 kg/dm3 at 68 degrees F, and the separating temperature is 158 degrees F. Illustration MO-0113
92 mm
From the graph shown in the illustration, if the separating temperature required is to be 167 degrees F, and the specific gravity of the oil is .98 kg/dm3 at 59 degrees F, what size regulating ring is required? Illustrated MO-0113
continue through the afterburning period
Fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and should _____.
thoroughly utilize the air charge
Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ____.
inject fuel at the proper time
Fuel injection systems are designed to primarily meter fuel, atomize fuel, and ____.
carbon accumulation on the nozzles
Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce ____.
reduced by finer atomization
Fuel oil penetration into the cylinder of a diesel engine is ______.
governor over-control
Governor hunting is caused by _______.
lube oil system
Heat exchangers are most commonly found in a small auxiliary diesel engine ______.
compression of air by the piston
Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the _____.
at the main engine fuel oil header
Heavy fuel oil used in the system shown in the illustration will have the lowest viscosity __. Illustration MO-0058
Increased exhaust valve wear
Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the following conditions could be expected if the ash content increases above this amount?
excessively early injection timing
High cylinder firing pressure, accompanied by low exhaust temperature, can result from _____.
engine overload
High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by _____.
The lube oil enters through the supply pipes shown as #11 and eventually drains to the main engine sump.
How is lubrication provided to the device shown in the illustration? Illustration MO-0120
In this arrangement an independent pump is utilized.
How is oil supplied to the device shown in the illustration? Illustration MO-0127
The T-handle is rotated.
How is the illustrated strainer element cleaned during engine operation? Illustration MO-0057
The water may be removed through the water drain valve or through the sludge ports during the sludge discharge cycle.
How may water be removed from the bowl of the separator as shown in the illustration? Illustration MO-0127
According to manufacturer's instructions
How often should the lubricating oil of a diesel engine be changed?
the system can be manually recharged
Hydraulic starters are installed on many lifeboat diesel engines instead of comparable air start systems, because _______.
inspection covers-should not be opened until the engine has cooled
If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase _____.
compensating needle valve should be adjusted to stabilize operation
If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperature, then the air should be purged, and the ______.
Secure or reduce fuel to that cylinder.
If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure the engine, which of the following actions should be taken?
overheated motor windings
If an auxiliary diesel engine equipped with an electric starting system cranks very slowly after repeated attempts to start, the cause could be a/an ____.
decrease to a slightly lower value
If governor Item No. 19 in the illustration were to break on a diesel engine operating under full load, the engine RPM will _____. Illustration MO-0095
Diesel
If point #1 in the diagram shown is the beginning of gas compression, which of the cycles listed is being illustrated? Illustration MO-0036
raise the piston temperature
If sludge accumulates on the underside of a diesel engine piston, it will _____.
excessive ring and liner wear
If the analysis of used lube oil indicates a high content of iron particles, this could indicate ______.
thermal efficiency will increase
If the compression ratio is increased on any diesel engine, _____.
excessive ring temperature
If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to _____.
corrosion of the nozzle tip
If the coolant temperature is too low as it passes through internally cooled fuel injectors, the injectors can be damaged by _____.
There will be an increase of chlorides measured at the distillate pump salinity cell.
If the demister used in the device shown in the illustration is improperly installed, which of the following will occur? Illustration MO-0110
reduce engine load
If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST ____.
malfunctioning governor
If the operating speed of a diesel engine increases without an apparent change in the engine control settings, you may suspect a _____.
1260 feet/minute
If the piston stroke in a four stroke cycle diesel engine is 10 1/2 inches and the speed of rotation of the crankshaft is 720 RPM, what is the average piston speed?
liquid in the cylinder
If the relief valve on a diesel engine cylinder lifts, the cause could be due to ____.
The larger sized regulating rings are designed to be used with oils of lower specific gravities.
If the separating temperature is to remain constant, what is the relationship between the specific gravity of he oil and the required size of the regulating ring? Illustration MO-113
decrease to a slightly lower value
If the speeder spring of a main propulsion diesel engine governor breaks while operating at full load, the engine RPM will ______.
excessive valve lash
If there is a 'clicking' sound in the valve compartment of a diesel engine, the cause may be _____.
starter drive shaft rotation
In a Bendix starter drive, the pinion engagement with the flywheel ring gear is initiated by _______.
engine speed
In a Roots-type rotary blower, the volume of air delivered is directly proportional to ______.
bottom of the lube oil sump
In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the ______.
adjusting the radiator louvers
In a diesel engine closed fresh water cooling system employing a radiator, proper water temperature can be obtained by ___.
15 psig
In a diesel engine closed freshwater cooling system, the cooling water pressure drop through the engine is 10 psig, and the pressure drop through the heat exchanger is 4 psig at maximum flow rates. The cooling water pump must produce a discharge head of at least ______.
sulfuric acid corrosion
In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in ____.
jacket water pressure should always be greater than the sea water pressure
In a diesel engine jacket water cooler, with sea water cooling the fresh water, the ____.
the shaft sleeve spiral helix and relative rotation between pinion and starter shaft
In a diesel engine starting motor equipped with a Bendix drive, the pinion moves the meshes with the flywheel ring gear due to ______.
volume
In a diesel engine, after ignition of the fuel occurs, but before the piston reaches TDC, there is little change in the cylinder ____.
improper adjustment of the bypass valve
In the common rail system, excessive pressure in the header may be caused by _____.
dirty oil input port
In the device shown in the illustration, the component lettered "A" is the ____. Illustration MO-0012
Piston rod
In the diesel engine illustrated, what part is under compression when firing is taking place in a particular cylinder? Illustration MO-0003
ensure one way air flow into the air header
In the diesel engine shown in the illustration, the purpose of the part labeled "P" is to _____. Illustration MO-0003
increasing the speed
In the illustrated auxiliary diesel engine governor, decreasing the distance between piece No. 6 and piece No. 10 will affect the engine by ____. Illustration MO-0094
F
In the illustrated engine, the fuel camshaft gear drive housing is indicated as letter ____. Illustration MO-0003
fuel oil pump
In the large slow-speed main propulsion diesel engine shown in the illustration, the part labeled "G" is the __. Illustration MO-0003
combustion at approximately constant pressure
In the pressure-volume diagram shown in the illustration, curve 'A-d' indicates _____. Illustration MO-0035
c
In the pressure-volume diagram shown in the illustration, fuel injection occurs at point ____. Illustration MO-0035
C
In the pressure-volume diagram shown in the illustration, the atmospheric pressure line is indicated by line _____. Illustration MO-0035
a 16 to 1 compression ratio
In the pressure-volume diagram, shown in the illustration, the volume line is divided into 16 units indicating _____. Illustration MO-0035
The combustion gases have expanded.
In the pressure-volume diagram, shown in the illustration, what is indicated to have occurred by the line connecting points 'd' and 'e'? Illustration MO-0035
idling gears rotate in a direction opposite to their rotation when carrying load
In the reversing reduction gear shown in the illustration, the forward and reverse main pinions are in constant mesh with the main gear. This means the ____. Illustration MO-0085
high-pressure fuel line
In the slow-speed diesel engine shown in the illustration, the part labeled "E" is the _____. Illustration MO-0003
ignite the fuel
In the starting process of a diesel engine, the main object is to attain the compression conditions sufficient to ____.
direct the flow from the distillate pump
Item "10" shown in the illustration is used to ____. Illustration MO-0111
spindle nut
Item "O" of the device shown in the illustration is the ____. Illustration MO-0112
In most situations this would never be done.
Item '17' in the illustration is the dipstick. When should the length of the dipstick be changed? Illustration MO-0122
constant or pulse pressure system
Large, two-stroke cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the ______.
propeller curve
Line "P" in the illustration is the _____. Illustration MO-0126
regulating the amount of fuel admitted to the engine
Load control on a diesel engine is accomplished by ___.
heated to reduce viscosity
Lube oil filters remove contaminants more efficiently if the oil being filtered is ______.
lube oil cooler failure
Lube oil in the fresh water cooling system of a diesel engine may result from a _______.
positive displacement type
Lube oil pumps taking suction from the sump of most small marine engines are usually ______.
improved atomization
Maintaining the proper fuel oil temperature will result in ______.
relief valve
Maximum lube system operating pressure for a diesel engine is normally regulated by a/an __________.
adjustable to meet lubrication requirements
Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are _____.
provide proper fuel/air mixing
Open combustion chambers are designed to ___.
turbulence
Precombustion chambers and energy cells in high-speed, small bore diesel engines all serve to increase ______.
contain a smaller portion of the total clearance volume
Precombustion chambers differ from turbulence chambers in that precombustion chambers _____.
remove condensation and other liquids from the cylinders
Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to ____.
improve combustion
Proper atomization of fuel in diesel engine combustion chambers will _____.
bearing pressure in a four-stroke cycle single acting diesel engine is continually reversed
Proper lubrication of the main bearings is more easily obtained in a single acting four-stroke cycle diesel engine than in a single acting two-stroke cycle diesel engine because ______.
avoid a buildup of pressure within the gear case
Reduction gear casings are vented in order to ___.
higher than raw water cooled installations
Reduction gear lube oil temperatures for keel cooler installations are generally _______.
filter the fuel
Regarding the fuel injector shown in the illustration, the purpose of piece #38 is to ___. Illustration MO-0059
aftercooler inlet
Regarding the turbocharger shown in the illustration, the part labeled "B" would be attached to the _____. Illustration MO-0080
reduce electrolytic action on heat exchanger metals
Sacrificial zinc anodes are used on the salt water side of diesel engine heat exchangers to ____.
percent of speed change necessary for corrective action by the fuel control
Sensitivity for a diesel engine governor is described as the _____.
piston cooling
Shaker, circulation, and spray are the three general methods used in ______.
overloading in all cylinders
Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling water temperature from all cylinders begins to rise above normal, you should suspect _____.
heating the engine coolant
Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions will be made easier by _____.
small diesel engines utilizing electric starting equipment
Starting aids such as glow plugs, are installed on _____.
small diesel engines with electric motor starters
Starting aids, such as glow plugs, are usually installed on ______.
spring force
Starting air check valves are held firmly on their seats by ______.
direct air admission
Starting systems for large, direct reversing, main propulsion diesel engines are usually ______.
affect fuel oil metering
Surface irregularities, such as erosion and pitting on injection pump plungers, will _____.
neutralize acids
The TBN value of diesel engine lube oil refers to its ability to _______.
alkalinity
The adverse effects of burning high sulfur fuel can be compensated for by using a cylinder oil having sufficient _______
rack position
The amount of fuel delivered by a unit injector is controlled by the _____.
injection chamber
The area indicated by the letter "L" of the device shown in the illustration s properly called the _____. Illustrated MO-0112
opening chamber
The area indicated by the letter "W", shown in the illustration is correctly termed the ____. Illustration MO-0112
two-stroke cycle diesel engines have a lower M.E.P. than four-stroke cycle diesel engines
The average exhaust temperature of a two-stroke cycle diesel engine with a turbine-drive supercharger is lower than a similar four-stroke cycle diesel engine at equal loads because _______.
mean effective pressure
The average pressure exerted on a piston during each power stroke is termed _____.
single-pass, fire-tube, scotch marine
The boiler shown in the illustration would be classified as ______. Illustration MO-64
inside diameter of the cylinder
The bore of a diesel engine cylinder describes the ____.
crankshaft speed in a two-stroke cycle diesel engine
The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In maintaining this relationship, the camshaft drive causes the camshaft to rotate at _____.
ignition qualities
The cetane number rates fuels for diesel engines according to its ____.
compressed air pressure
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by ______.
a spray of fuel into a turbulence combustion chamber
The combustion of fuel for the illustrated engine is initiated by __. Illustration MO-0020
stop fuel delivery to the injector
The component identified as item No. 15 is used to ___. Illustration MO-0016
a pneumatic signal which activates a hydraulic control cylinder allowing the camshaft to shift axially
The component labeled "A" on the engine reversing device shown in the illustration, performs its function by transmitting ______. Illustration MO-0125
slow-speed engine fuel pump
The component shown in the illustration would be identified as a/an ___. Illustration MO-0097
cylinder volumes at top dead center and at bottom dead center
The compression ratio of a diesel engine refers to the ratio between the ____.
rotating the plunger and position of the helix
The control rack to a unit injector regulates fuel delivery by ______.
length of the stroke
The cubic inch (or liter) displacement of a cylinder is determined by the diameter of the piston and the _____.
supply the force required to shift the engine camshafts axially to reverse engine rotation
The cylinders labeled "B" and "C" in the illustration are used to ______. Illustration MO-0125
the size of the holes in the fuel nozzle
The degree of fuel atomization in a diesel engine cylinder depends primarily on ____.
high heating value and low sulfur content
The desirable properties of a marine fuel oil should include ______.
regulating ring
The device labeled "A", shown in the illustration, is known as the ____> Illustration MO-0112
centripetal pump chamber cover
The device labeled "B", shown in the illustration is known as the _____. Illustration MO-0112
top
The device labeled "D", as shown in the illustration, is the bowl ____. Illustration MO-0112
centrifugation chamber bottom gasket
The device labeled "H", shown in the illustration is referred to as the ____. Illustration MO-0112
upper locking ring
The device labeled 'C' shown in the illustration is known as the ____. Illustration MO-0112
remove most contaminants present in the air supply
The device represented by the symbol "B" in the illustration is used to ______. Illustration MO-0115
provide lubrication to the cylinder
The device shown in figure "A" of the illustration is used to ______. Illustration MO-0042
Q
The device shown in the illustration can be automatically or manually desludged. The closing sequence at the end of the desludging cycle is initiated by opening which of the labeled components listed below? Illustrated MO-0012
comparator type mist detector for large low-speed, crosshead type engines
The device shown in the illustration is a ______. Illustration MO-0008
comparator type mist detector
The device shown in the illustration is classified as a/an _______. Illustration MO-8
load limiting governor
The device used to limit engine torque at various engine speeds is called a ____.
Ideally the engine should be operated in area "A", however, it is permissible to intermittently operate the engine in area "B".
The diagram shown in the illustration may be used to determine the proper operation of the engine. Which of the following statements represents an accurate interpretation of the diagram? Illustration MO-0126
exhaust valve spring
The diesel engine component labeled "1", shown in the illustration is called a/an ______. Illustration MO-0122
cylinder head
The diesel engine component labeled "3", shown in the illustration is called the ____. Illustration MO-0122
governor flyweight motion acting on fuel controls through suitable linkage
The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by ______.
S
The discharge nozzle shown in the illustration, is indicated by the letter ____. Illustration MO-0112
Q
The exhaust ports shown in the illustration are identified with the letter '__'. Illustration MO-0003
power the turbocharger
The exhaust system for a turbocharged diesel engine functions to ____.
allow for an increase in water volume as the engine warms up
The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and ___.
the speed of the bowl and the condition of seal "U'
The force developed by the liquid within space "J" of the device shown in the illustration depends upon ____. Illustration MO-0112
maintaining proper combustion and scavenging
The formation of carbon monoxide in diesel exhaust gases is reduced by _____.
"19"
The fuel injector for the diesel engine shown in the illustration, is identified as ____. Illustration MO-0122
provide remote control for speed adjustment
The function of the synchronizing motor on the generator governor illustrated is to _____. Illustration MO-0092
sliding piston
The gasket "U" shown in the illustration, is used to seal the liquid space below the ____. Illustration MO-0112
feeler gauge
The gear drive, shown in the illustration, can have the backlash determined best by using a _____. Illustration MO-0091
The engine speed can be controlled using the fuel control lever without changing the position of the maximum fuel stop.
The governor utilized with the device shown in the illustration has become inoperative while the vessel is underway at sea. Which of the following statements describes what action should be taken? Illustration MO-0119
the speed droop lever fulcrum is changed
The governor, shown in the illustration, will have its preset speed droop altered whenever ____. Illustration MO-0092
electrical conduits and circuitry
The graphic dotted line between items "27", "12", "9" and "20" shown in the illustration, is used to indicate the use of ____. Illustration MO-0111
is self-desludging
The greatest difference between the centrifuge bowl shown in the illustration and that of a tubular bowl, with straight, vertical, interior surfaces, is that the illustrated unit ____. Illustration MO-0012
shape of the combustion chamber
The greatest turbulence in a diesel engine cylinder is created by the ____.
Titanium
The heat exchanger plates, used in the device shown in the illustration, are produced from which of the listed materials? Illustration MO-0110
cold at idle
The highest indicated lube oil pressure in a diesel engine should be expected when the engine oil is _______.
after TDC
The highest pressure in a diesel engine cylinder normally occurs _____.
low governor power
The hunting of a diesel engine may be caused by _____.
designed engine speeds are decreased
The ignition quality of diesel fuel becomes LESS critical as _____.
rotating drum
The indicator card shown in the illustration is produced with a/an _____. Illustration MO-0108
"G"
The injector rack of the diesel engine shown in the illustration is indicated by the component labeled _____. Illustration MO-0122
none of the above are correct
The inlet valves for the diesel engine shown in the illustration are indicated by the letter or number _____. Illustration MO-0122
increased compression ratio
The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in ______.
measure cylinder compression or firing pressures
The instrument shown in the illustration would be used on a diesel engine to ______. Illustration MO-0031
upper bowl gasket
The item indicated by the letter "F" of the device shown in the illustration is the ___. Illustration MO-0112
non-condensable gases and brine
The items labeled "21" and "22", shown in the illustration are used to remove ___. Illustration MO-0111
water
The large, slow-speed, main propulsion diesel engine shown in the illustration, the part labeled 'B' contains ______. Illustration MO-0003
two-stroke cycle engine
The load is always placed on the lower half of the main bearings in a/an ____.
the filter to operate more efficiently
The lube oil cooler is located after the lube oil filter in order for ______.
gear pump
The lube oil pump used in a diesel engine is normally a ______.
12
The main engine thrust bearing shown in the illustration contains how many thrust shoes? Illustration MO-0121
"O"
The main lube oil manifold, for the diesel engine shown in the illustration, is represented by the letter or number _____. Illustration MO-0122
method of igniting fuel
The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the _____.
lube oil line
The part labeled "X" shown in the illustration is a _____. Illustration MO-0003
maximum pressure in the engine cylinders during injection
The minimum fuel oil delivery pressure required for efficient injection depends primarily on the ____.
all of the above
The minimum speed an engine must attain before ignition can occur depends upon ____.
dirt
The most common contaminate of governor hydraulic fluid is _____.
manometer
The most common instrument used to measure diesel engine exhaust pressure is the _____.
during initial starting
The most crucial time for any bearing with regards to diesel engine lubrication is ______.
brake horsepower
The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work. This is known as _____.
hydraulic "push rods"
The opening of an exhaust valve on a modern, large, low-speed, main propulsion diesel engine, may be actuated by ____.
The temperature of the sea water entering the cooler will be higher when operating with the distiller on line.
The operation of the lube oil cooler, shown in the illustration as item No. 4, will be characterized by which of the following statements? Illustration MO-0111
individual cam for each pilot valve
The pilot valves in an air pilot starting system for a two-stoke cycle, direct reversing, main propulsion diesel engine are operated by either a ported distributor disc or a/an ________.
Bendix drive or similar mechanism
The pinion of an auxiliary diesel-electric starting motor normally engages the flywheel ring gear by means of a/an _______.
attached to the air ejector
The pipe identified by the letter "J" shown in the illustration is ______. Illustration MO-0110
main engine speed
The pneumatic circuit shown in the illustration is part of a control system used with large low-speed diesel engines. The arrangement may be used to control _____. Illustration MO-118
Sludge discharge cycle
The port "X" shown in the illustration allows water to enter the adjoining chamber. During what cycle of operation will this occur? Illustration MO-0112
pumping loss
The power consumed during the scavenging process of a diesel engine is known as the ______.
air charge density decreases
The power output of a turbocharged diesel engine will drop if the cooling water flow through the aftercooler is interrupted because the _____.
expansion during the combustion process
The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the _____.
B
The pressure-volume diagrams illustrated are of four internal combustion engine cycles. Which one represents the theoretical diesel cycle? Illustration MO-0102
maintain a constant speed with variations of load
The principal characteristic of an isochronous governor is it will _____.
blood poisoning
The principal hazard to personnel when using a diesel engine fuel nozzle tester is _____.
cool the exhaust valves
The process of scavenging a two-stoke cycle diesel engine serves to _____.
a possible overheated bearing
The purpose of an oil mist detector in a main propulsion diesel engine is to warn of _____.
prevent governor hunting
The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to ____.
assist in a quick cutoff of fuel injection
The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to ____.
create a high turbulence within the main combustion chamber
The purpose of the energy cell, or air cell, is to _____.
restore hydraulic pressure in the accumulator after starting
The purpose of the engine-driven hydraulic pump in an auxiliary diesel engine hydraulic starting system is to _____.
change fuel from heavy to light oil or vice versa while insuring that oil is returned to the proper day tank
The purpose of the interlocked three-way valve shown in the illustration is to ____. Illustration MO-0058
reduced during periods of low load operation
The rate of cylinder lubricating oil metered to each cylinder of a large, low-speed, main propulsion diesel engine is ______.
turbulence of the air charge
The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of the ignition delay period and the ____.
mechanical efficiency
The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its ____.
maintain specified injection characteristics
The replacement piping for diesel engine high pressure fuel systems must be the same length and diameter as the original piping to ____.
"C" and "Y"
The rocker arms of the diesel engine shown in the illustration are indicated by ___. Illustration MO-0122
B
The section of the turbocharger which would be connected to the aftercooler inlet is labeled _____. Illustration MO-0080
knurling the piston skirt surface
The service life of a worn aluminum piston for an auxiliary diesel, for which no spares are readily available, can be extended by ______.
950 RPM
The speed of the camshaft in a two-stroke/cycle diesel engine, running at 950 RPM, is _____.
a special cleaning wire
The spray holes in a diesel engine fuel valves should be cleaned using carbon solvent and ______.
bleed off all accumulator pressure in "E"
The starter control valve in the hydraulic system shown in the illustration is malfunctioning. Before removing the valve, you must first ______. Illustration MO-0049
The device is used to interrupt the pneumatic signal to port "A" of the distributor shown in illustration MO-0053
The symbol with the output 'ee' shown in the illustration, is properly called a blocking valve. Which of the following statements describes its function when incorporated into a slow speed diesel engine pneumatic control circuit? Illustration MO-0116
located in the oil outlet piping
The system shown in the illustration utilizes a water transducer which is ___. Illustration MO-0127
changing the spring compression opposing the bellows
The temperature at which an adjustable bellows type thermostatic valve operates is determined by ____.
203 degrees F to less than 212 degrees F
The temperature of the contaminated fuel oil fed to the centrifuge shown in the illustration should be ____. Illustration MO-0012
0.500694444444444
The theoretical minimum compression ratio necessary to ensure compression ignition in a direct injection diesel engine is _____.
mechanical energy
The thermal energy produced by an internal combustion engine is transformed into ____.
Place the thermostatic element in a container of water at various operating temperatures and note the movement of the valve stem.
The thermostatic valve in the illustration is used for controlling the coolant temperature in a main propulsion diesel engine. Which of the following can be used to verify proper valve operation with the valve disassembled? Illustration MO-0079
No appreciable wear has occurred, and the proper maintenance procedures should continue to be followed.
The thrust bearing shown in the illustration has over eight years of ahead running time. Measurements show "i1" is 4 mm and "i2" is 1 mm. Which of the following conditions is indicated and what steps should be taken, if any? Illustration MO-0121
ignition delay
The time between injection and ignition of the fuel is known as _____.
The liquid enters via port "X" into the opening space with the net resultant force causing the piston slide to move down.
The unit shown in the illustration is beginning the sludge discharge cycle. The operating liquid solenoid valve has been energized and space "J" is filling up. Which of the following actions should occur next? Illustration MO-0112
fed from mechanical lubricators
The upper piston rings in large, slow-speed, two-stoke cycle diesel engines are most effectively lubricated by oil ______.
"N"
The water inlet manifold for the diesel engine shown in the illustration is represented by the letter or number ____. Illustration MO-0122
"R"
The wear liner shown in the illustration is indicated by the letter ____. Illustration MO-0112
water vapor and carbon dioxide
Theoretical perfect combustion in a diesel engine yields by-products of ____.
seal against scavenge air leakage
There are two glands provided where the piston rod exits the cylinder shown in the illustration. The purpose of the top gland is to _____. Illustration MO-0083
1291 ft/min (393 m/min)
What is the average piston speed of a five cylinder low-speed engine with a bore of 29.5 inches (75 cm), a stroke of 63 inches (160 cm), and a rated speed of 123 RPM?
Secure the fuel supply and block the air intake
What is the best way of stopping an overspeeding diesel engine?
The device delivers the oil for piston cooling, in addition to liner lubrication.
What is the function of component "13" shown in the illustration? Illustration MO-122
It serves as a hinge for ease of opening the shell.
What is the function of device "A" shown in the illustration? Illustration MO-0110
It condenses the vapors formed in section "G".
What is the function of device "B" shown in the illustration? Illustration MO-0110
It removes moisture entrained in the vapors produced in section 'G'.
What is the function of device 'C' shown in the illustration? MO-0110
It heats the entering feed water.
What is the function of item 'D' shown in the illustration? MO-0110
Increase the air density
What is the function of the aftercoolers installed in the diesel engine air intake system?
The cooler removed sensible heat from the jacket water.
What is the function of the device labeled "3" shown in the illustration? Illustration MO-0111
This jacket water pump circulates fresh water throughout the engine cooling and distiller heating systems.
What is the function of the item "7" shown in the illustration? Illustration MO-0111
The normal play on both sides of the shaft will be one tenth of a millimeter.
What is the normal bearing clearance permitted at the horizontal axis of the shaft for the bearing shown in illustration? Illustration MO-0121
It removes the distillate condensed in area "24".
What is the primary function of item '15' shown in the illustration? Illustration MO-111
Atomizing
What is the term given to the process of breaking up fuel oil into very fine particles for better combustion?
Water
What is used as the primary operating medium during the sludge discharge cycle, shown in the illustration? Illustration MO-0112
The feed water enters the device and vaporizes under vacuum conditions.
What occurs in the space labeled "G" of the device shown in the illustration? Illustration MO-0110
The feedwater flowing through the inside of the tubes is being heated by the jacket water on the outside of the tubes.
What occurs within the tubes of the device labeled "23" shown in the illustration? Illustration MO-0111
Found within the thrust bearing cap or cover are extended protrusions to position the thrust shoe segments and maintain minimum clearance.
What prevents the thrust bearing blocks shown in the illustration from rotating within the housing? Illustration MO-0120
The solenoid valve closes, allows the water in the opening chamber to bleed off through "S", and the sliding piston moves upward due to the force developed in area "J".
What terminates the sludge discharge cycle of the device shown in the illustration? Illustration MO-0112
Michell bearing
What type of bearing is shown in the illustration? Illustration MO-0120
shunt system
What type of engine lubrication oil filter system send filtered oil directly to the high-pressure supply gallery?
Vertical opposed-piston
What type of marine engine has a fuel nozzle and combustion chamber located between two pistons in a common cylinder liner?
10 degrees to 20 degrees F
What would be considered a normal temperature increase between the inlet and outlet jacket cooling water of a medium or high-speed diesel engine operating at normal load?
The fuel metering will vary.
When a fuel ignition nozzle overheats, which of the problems listed can be expected?
combustion pressure on the power stroke
When a generator diesel engine is operated at partial load, as compared to full load, a decrease will occur in the average _____.
distorted spray pattern
When a nozzle tester is being used to test a "closed" type fuel injection nozzle, a clogged nozzle orifice will be indicated by a ______.
A serious hazard of blood poisoning exist if the fuel spray penetrates the skin of the operator
When a nozzle tester is used to check the spray pattern of a diesel fuel injection nozzle, which of the following statements is true?
all of the above
When a piston is removed from a diesel engine for maintenance, the piston should be examined for _____.
overheating because of slipping shoes
When an additional load is applied to a diesel engine which is using an inadequately inflated air bladder clutch unit, you can expect ______.
power stroke
When an air started, four-stroke cycle diesel engine is being cranked over, the starting air is admitted to each cylinder during the beginning of its _______.
the overrunning clutch.
When an engine fitted with a hydraulic starting system starts up, the starter is protected from the higher speed of the engine by _____.
4500 kg-meters per minute = 1 HP
When calculating the indicated power developed in a diesel engine cylinder, 1 horsepower is equivalent to '33,00 foot-pounds per minute'. What conversion factor would be used if the values are based on metric 'kilogram-meters per minute'?
use a fuel having a lower ignition temperature
When restarting a heavy fuel diesel engine that has been stopped for some time, the engineer should _____.
The temperature of the fuel from the preheater should be gradually reduced after switching over the three-way valve.
When running a large, dual fuel, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching from heavy fuel oil to diesel oil?
proportional to the lube oil viscosity
When starting a diesel engine at temperatures below 70 degrees F, the frictional resistance to turning will be ______.
low starting air pressure
When starting air is admitted, a diesel engine turns over very slowly without firing. The cause may be ______.
renewing both driving and driven gears as a set
When the timing gear backlash for a Roots-type blower has become excessive, the problem is properly repaired by ____.
When tightened, the lock ring allows for movement of the sliding piston and positions the sliding piston within the bowl bottom.
When tightening the lock ring "G" of the device shown in the illustration, two events are simultaneously accomplished. Which of the following statements represents these events? Illustration MO-0112
use a specific opposing pattern while measuring the distance to which the plates have been compressed
When tightening the plate type heat exchangers shown in the illustration, care must be taken to ______. MO-0110
All of the above
When would the available energy of the exhaust gases of a two-stroke cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?
In the opening chamber labeled "L".
Where does the shoot cycle operating liquid first come in contact with the rotating forces of the device shown in the illustration? Illustration MO-0112
Pressurized tank
Where is the air charge for an air starting system stored?
From having passed through "23".
Where is the latent heat obtained to create vapor from the feedwater in the illustrated distiller? Illustration MO-0111
pump suction line
Where would a coarse screen wire mesh strainer normally be found on a diesel engine lubrication system?
Protects metallic surfaces from corrosion and the coolant from freezing
Which of the listed effects would mixtures of ethylene glycol and phosphate compounds have on the metal surfaces of the cooling system of a diesel engine?
Electric power and starting air
Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?
Sludge
Which of the listed substances can be satisfactorily removed form diesel fuel by centrifuging?
Soft copper
Which of the listed types of gasket material should be used on high-pressure fuel oil lines on a diesel engine?
Air delivery is approximately proportional to engine speed.
Which of the operating characteristics listed is correct concerning the blower shown in the illustration? Illustration MO-0082
Frequent draining-of accumulated moisture.
Which of the routine maintenance procedures listed is required for starting air receivers?
Critical speed.
Which of the terms listed below represents the operational speed at which excessive engine vibration is created?
Steel ruler or tape measure
Which of the tools listed must be used when retightening the plate type heat exchangers used in the device shown in the illustration? Illustration MO-0110
Constant pressure
Which of the turbocharging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?
Pulse pressure
Which of the turbocharging systems listed operates with the least average back pressure in the exhaust manifold?
Helical
Which of the types of reduction gearing listed is best suited for medium-speed main propulsion units?
Valves J, K, L, M open, valves D and H closed.
Which of the valve arrangements listed would be correct for operating the distillation plant shown in the illustration? Illustration MO-0111
Cooling water flow through aftercoolers
Which operating parameter may need to be decreased when running a large main propulsion diesel engine at low load conditions?
"A" and "C", "L" and "M"
Which set of valves will be opened intentionally to remove heat from the main engine jacket cooling water system shown in the illustration? Illustration MO-0111
Maximum cylinder firing pressure is not developed until the piston passes TDC.
Which statement about diesel engine combustion is true?
Multi-hole
Which type of diesel engine fuel nozzle is shown in the illustration? Illustration MO-0059
Axial piston
Which type of starter motor is normally used in a diesel engine hydraulic starting system?
gravity disk inside diameter is too large
While operating he fuel oil centrifuge shown in the illustration, the fuel oil is being continuously ejected with the sludge and the seal water. The probable cause is the ____. Illustration MO-0012
the seal ring on the operating slide is defective
While operating the fuel oil centrifuge shown in the illustration, the bowl fails to open for sludge ejection. The probable cause is that ____. Illustration MO-0012
Set the fuel rack to zero.
While underway, which of the following would be the FIRST step in reversing a direct reversing large, slow-speed, main propulsion, diesel engine?
the engine is cold
White smoke issuing from the exhaust of an auxiliary diesel engine could mean _____.
The inertia of the turbocharger rotor causes a time lag which delays the turbocharger speed increase.
Why will a turbocharged diesel engine produce black smoke if excessive additional load is applied too quickly?
their position in the lubrication system
Wrist pin bearings are difficult to lubricate because of their oscillating motion and _____.
sea water
in the engine shown in the illustration, the part labeled 'W" is cooled by ____. Illustration MO-0003
better visual metering adjustment
one advantage of a vacuum feed sight glass indicator used on cylinder lubricators over the discharge side liquid filled type sight glass is ______.
Lube oil pressure
which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?
