Older Motor plants pdf 41-50
At rated engine load and RPM, the diesel engine turbocharger is powered by __________. belt drive exhaust gases electric motor friction clutch
B
Auxiliary boilers are divided into several classifications, one of which is __________. water-tube supercritical circulation water-tube forced circulation fire-tube controlled circulation fire-tube express circulation
B
Auxiliary diesel engines can be automatically shut down as a result of __________. low lube oil temperature low lube oil pressure high exhaust temperature high cooling water pressure
B
Barrel face, taper face, grooved, and chrome plated are all types of diesel engine __________. pistons piston rings piston skirts cylinder liners
B
Bearing clearances in small highspeed diesel engines should be measured using __________. gage blocks plasti-gage feeler gages round solder wire
B
An overcorrecting and unstable engine governor operation is known as __________. droop dead banding dash potting hunting
D
As illustrated, what is the maximum allowable clearance permitted between the bearing and the shaft along its vertical axis? 1.00 mm 0.30 mm 0.46 mm 0.80 mm MO-0121
D
An operating diesel engine may gradually lose output power due to a/an __________. restricted turbocharger air intake filter pressure increase in the air manifold dribbling injector low fuel viscosity
A
An operating diesel engine that suddenly loses power, is due to a/an __________. restricted turbocharger air intake oil leak into the turbocharger dribbling injector low fuel viscosity
A
Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will __________. reduce engine horsepower output aid in silencing the exhaust noise increase the mean effective pressure contribute to effective cylinder scavenging
A
As shown in the illustration of the fuel injection pump, the component labeled "J" would be identified as the _____. Delivery check valve assembly Control rack and pinion Plunger and barrel spring Control rack and sleeve MO-0061
A
As shown in the illustration, engine piston cooling oil is supplied to the pistons by a/an __________. oil spray oil wick oil control rings drilled passage through the camshaft MO-0122
A
As shown in the illustration, if the vessel was operating at full sea speed, the area labeled "A" would be used to ________. collect the saturated steam generated in area "1" by the engines exhaust gases superheat the steam generated by the oil fired mechanical burner preheat the feed water to the waste heat boiler collect stack gas MO-0128
A
As shown in the illustration, the area labeled as "C" would be identified as the ________. oil fired boiler furnace oil fired boiler mud drum oil fired boiler water drum waste heat boiler steam separator MO-0128
A
As shown in the illustration, the component labeled "E" would be identified as a ______. waste heat boiler circulating pump boiler water feed pump main condensate pump fuel oil service pump MO-0128
A
As shown in the illustration, which of the following conditions would be responsible for a 'low pressure in oil outlet' alarm to be indicated? Throughput too low Separating temperature too low Controller set point changed Emergency stop button not reset MO-0127
A
At the beginning of the prepurge period on an automatic auxiliary boiler equipped with a programmed control system, the unit will not restart if airflow is not sensed and __________. the damper is not sufficiently opened the damper is not fully closed oil pressure is not sensed water pressure is not sensed
A
At the point in time indicated by the information shown in the illustration, the #3 piston is on the __________. intake stroke exhaust stroke compression stroke power stroke MO-0038
A
At what pressure should a cylinder relief valve of an internal combustion engine be set to relieve? The device should be set to relieve at a pressure not more than 40 percent in excess of the maximum firing pressure. The valves should be set to just stop relieving with the engine running at full speed. Cylinder relief valves should only be adjusted by an authorized repair facility with the permission of the OCMI. Cylinder relief valves are no longer required for large low speed engines due to advancements in combustion engineering.
A
Automatic burner shutdown in an auxiliary boiler, as a result of a component failure in the flame safeguard controls, will __________. prevent the boiler from automatically relighting eliminate the need for furnace purging cause automatic restart after a purge period cause an explosion in the boiler furnace
A
Bearing 'crush' as applied to diesel engine main bearings, will result in __________. positive seating of the bearings in their housings above normal operating temperatures damage to the journals damage to the bearings
A
Bearing wear on a split sleeve type bearing is normally measured with a __________. ball anvil micrometer pair of outside calipers and a dial indicator pair of inside calipers depth micrometer
A
Before an auxiliary boiler is shutdown for an extended period of time, the water in the boiler should have a pH value of __________. 10 7 4 1
A
Before shutting off the fuel supply to stop a medium or high-speed diesel engine, why is it necessary to allow the engine to idle for a few minutes? To prevent internal damage from local overheating. To ensure the fuel nozzles are flushed clean. To clear the smoke stack. To let the waste heat boiler reduce its rate of steam generation.
A
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 __________. high cost of fuel serious fire hazard pollution hazard poor combustion which will occur in that cylinder
B
An incorrect spray pattern produced by a diesel engine fuel injection nozzle can be directly caused by __________. incorrect fuel rack setting overcooling of the nozzle low firing pressure excessive lube oil temperature
B
An increase in crankcase pressure generally indicates __________. worn connecting rod bearings worn engine cylinder liners high cylinder operating temperature stuck spring-loaded manhole covers
B
An increased pressure differential between the inlet and outlet of a strainer usually indicates the strainer is __________. holed fouled clean dry
B
An indication of a diesel engine air intake being partially clogged, is __________. low firing pressure and low exhaust temperatures low firing pressure and high exhaust temperatures high firing pressure and low exhaust temperatures high firing pressure and high exhaust temperature
B
An indication of an overloaded main propulsion diesel engine is __________. white smoke in the exhaust high exhaust gas pyrometer readings sparks in the exhaust blue smoke in the exhaust
B
An inline engine having a nine inch bore and more than eight cylinders will __________. incorporate the use of two explosion relief valves have three explosion relief valves have at least eight explosion relief valves not be required to have explosion relief valves
B
An over speed safety shutoff for a diesel engine is shown in the illustration. Which of the following movements will occur if the engine over speeds? Piece #8 will move up Piece #8 will move down Piece #10 will rotate counterclockwise Piece #9 will move to the left MO-0104
B
An over speed trip serves to __________. stop the engine by cutting off the cooling water supply stop the engine by closing the air intake and/or fuel supply slow the engine to idle speed slow the engine to just below maximum speed
B
As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease? Compression ratio Air/Fuel ratio Compression pressure Lube oil pressure
B
As shown in the illustration of the fuel injection pump, the function of the area designated as "L" is to __________. control the fuel injection rate allow excess fuel oil to return to the fuel oil system provide for plunger lubrication relieve excessive injector discharge pressure MO-0061
B
As shown in the illustration of the fuel injection pump, the section designated as "M" is referred to as the __________. plunger sleeve plunger helix plunger relief shoulder plunger control tab MO-0061
B
As shown in the illustration, the component labeled "F" would be identified as a ________. waste heat boiler circulating pump boiler water feed pump main condensate pump fuel oil service pump MO-0128
B
As shown in the illustration, the function of component "1" is to ________. generate superheated steam to operate the turbo generator evaporate circulating boiler water into saturated steam maintain a water level in the steam drum condense excess steam produced in the boiler MO-0128
B
As shown in the illustration, the viscosimeter would be used to directly control the output of which of the following components? Outflow from HFO day tank. Final heaters. Injector pumps. HFO purifiers. MO-0077
B
As shown in the illustration, what component would normally be installed at location "D" ? Boiler water level indicator Oil fired mechanical burner Boiler soot blower unit Flue gas smoke indicator MO-0128
B
As shown in the illustration, which of the following conditions may be the cause for the 'low pressure in oil outlet' alarm to be illuminated? Vibration switch activated. Faulty water solenoid valve. Throughput too high. All of the above are correct. MO-0127
B
As shown in the illustration, which of the following conditions would be responsible for a 'low pressure in oil outlet' alarm indication? Steam supply pressure low. Separating temperature too high. Throughput too high. Regulating valve V4 is closed. MO-0127
B
Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires __________. grinding the spare plunger to the barrel replacing the plunger and the barrel highly polishing both the plunger and barrel replacing plunger only
B
Before installing rings on a diesel engine piston, you should check the ring __________. diametrical tension gap clearance radial thickness outside diameter
B
An important design characteristic of an explosion relief valve for a diesel engine is the ability to __________. open slowly to permit a gradual reduction of crankcase pressure open quickly against crankcase pressure to prevent a possible implosion close quickly in order to prevent an inrush of air close slowly to permit proper seating of the valve disc and neoprene sealing surfaces
C
An increase in the air inlet manifold pressure of a diesel engine will result in a/an __________. decrease in maximum cylinder pressure increase in ignition lag decrease in fuel consumption per horsepower-hour decrease in exhaust manifold pressure
C
An increase in the fuel injection pump discharge pressure can be caused by a/an __________. leaking delivery valve increase in engine load plugged injector spray hole increased plunger stroke
C
An indication of high salinity in the distillate discharged from a low pressure distilling plant can be the result of __________. maintaining the proper distilling plant heat balance carrying the brine level below normal leaks in the demister baffles venting of the saltwater heater drain pump
C
An over speed trip stops a diesel engine when the engine __________. runs out of fuel has low lubricating oil pressure exceeds a set maximum speed has high cooling water temperature
C
Antifreeze solutions containing ethylene glycol, should not be mixed with corrosion protection oils, as the resultant mixture __________. is dangerously flammable promotes scale buildup may cause frothing has a higher chloride content
C
As a general rule, what would be the recommended operating water jacket outlet temperature range from the engine for medium speed marine diesels set up with closed treated fresh water cooling systems and fitted with vented expansion tanks? 105° to 120°F 135° to 150°F 165° to 180°F 195° to 215°F
C
As shown in the illustration of the fuel injection pump, the component labeled "N" would be identified as the _____. Sleeve Control Rack Barrel Plunger MO-0061
C
As shown in the illustration of the fuel injection pump, the function of the area designated as "G" is to _______. control the fuel injection rate lubricate the plunger provide a fuel supply to the pump relieve excessive injector discharge pressure MO-0061
C
As shown in the illustration, the alarm indicated by 'emergency stopping or vibrations' may be caused by __________. the rotating action of the centrifugal switch new foundation bolt assemblies and dampeners a failure to reset the emergency stop button the emulsification of water and fuel within the parting chamber MO-0127
C
As shown in the illustration, the component labeled "H" would be identified as a ________. waste heat boiler circulating pump boiler water feed pump main condensate pump fuel oil service pump MO-0128
C
As shown in the illustration, the main function of the valve labeled "6" would be to ________. raise vacuum during startup recirculate feed water at low loads relieve excess steam pressure when the turbo generator is idling provide make-up feed water for the hotwell MO-0128
C
As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST? Exhaust temperatures Raw water pressure Lube oil pressure Air box pressure
C
At bottom dead center, the centerline of the connecting rod usually coincides with the __________. angularity of the piston motion inertia moment from the piston centerline of the cylinder centerline of the king pin
C
At the end of a normal sludge ejection cycle, the bowl of the centrifuge, shown in the illustration, will be closed only when the valve(s) __________. 'V5' is closed, with 'V10,' 'V15,' and 'V16' are open 'V5,' 'V10,' 'V15,' and 'V16' are closed 'V10' and 'V16' are open, with 'V15' closed 'V5,' 'V10,' 'V15,' and 'V16' are open MO-0024
C
At top dead center, the centerline of the connecting rod usually coincides with the __________. angularity of the piston motion inertia moment from the piston centerline of the cylinder centerline of the king pin
C
An improperly assembled centrifuge, of the type shown in the illustration, may result in which of the following operating conditions to occur? Excessive wear of fuel injection equipment. Increased main bearing wear. Severe injury to engine room personnel. All of the above. MO-0112
D
An increase in diesel engine crankcase pressure generally indicates excessive __________. compression pressure lube oil header pressure scavenge air pressure piston ring blow-by
D
An increase in power output of a turbocharged diesel engine operating at a constant engine speed results in __________. higher exhaust temperature increased turbocharger speed higher air box pressure All of the above are correct
D
An increase in the load on a turbocharged diesel engine operating at constant speed will result in an increase in __________. exhaust temperature air box pressure mean effective pressure all of the above
D
An indicator card or pressure-volume diagram, shows graphically the __________. compression ratio of the engine volume of the engine relationships between pressure and temperature during one stroke of the engine relationships between pressure and volume during one cycle of the engine
D
An oil-operated, direct-reversing mechanism on a large, low-speed, main propulsion diesel engine, can serve to __________. bring the respective cam under the fuel pump roller rotate or displace the camshaft according to engine design bring the respective cam under the air distributor pilot valves all of the above
D
As shown in the illustration, the function of the component labeled "G" would be to ________. condense steam exhaust from the turbo generator provide a source of circulating water into the waste heat boiler provide a source of fuel for the fuel oil service system provide a reservoir of feed water for the boiler feed pump MO-0128
D
As shown in the illustration, what component would normally be installed at location "B"? Boiler water level indicator Oil fired mechanical burner Boiler soot blower unit Flue gas pyrometer MO-0128
D
As shown in the illustration, which of the following conditions would cause the 'low pressure in oil outlet' alarm to be illuminated? Throughput too low. Separating temperature too high. Line to pressure switch PS2 obstructed. All of the above are correct. MO-0127
D
Automatic combustion control systems for auxiliary boilers are designed to cycle burners on and off in response to the __________. excess air pressure steam moisture content furnace temperature steam pressure
D
Automatically fired auxiliary boilers use fuel oil strainer arrangements of either the simplex type or __________. filter bag type metal disc type absorbent type duplex type
D
Auxiliary boilers can be classified as __________. water-tube natural circulation boilers fire-tube boilers water-tube forced circulation boilers all of the above
D
Auxiliary diesel engine electric starting motors use __________. alternating current transformers 400 cycle per second motor-generator power low amperage, high voltage AC power battery power direct current
D
Before any auxiliary diesel engine hydraulic starting system is opened for servicing or repair, you must __________. place all control levers in the 'HOLD' position ensure that the hydraulic fluid reservoir is full block all hydraulic hoses using high pressure covers bleed off all hydraulic pressure from the system
D
Before any work is done on a burner in an automatically fired auxiliary boiler, you should always __________. block all control valves allow the boiler to cool completely lock all safety interlock switches closed close all manually operated fuel valves
D
Before being shut down, a diesel engine should idle a few minutes in order to __________. prevent governor surging at shutdown make sure the fuel nozzles are flushed clean prevent pressure buildup in the fuel lines prevent damage from localized overheating
D
