Lubrication, coolant final study set
Which of the following diesel engine oil grades would function best in subarctic temperature conditions? 10W 0W-30 10W-30 15W-40
0W-30
When should a diesel engine crankcase oil level be checked to produce the most accurate reading? engine running immediately after shutdown 10 minutes after shutdown weekly
10 minutes after shutdown
What mixture concentricity of propylene glycol to water provides maximum antifreeze protection? 100 percent 60 percent 30 percent 20 percent
100 percent
What would be a typical maximum intake restriction specification for a naturally aspirated diesel engine? 15 inches H 2 O 15 inches Hg 25 inches H 2 O 25 inches Hg
15 inches H 2 O
In what year was API CK-4 lube oil introduced? 2006 2007 2017 2020
2017
Which of the following values would be typical of engine oil at operating temperature? 165 degrees Fahrenheit 185 degrees Fahrenheit 195 degrees Fahrenheit 230 degrees Fahrenheit
230 degrees Fahrenheit
Which of the following specs is the usual start-test spec when testing an air-to-air, boost air heat exchanger? 5 psi 15 psi 30 psi 50 psi
30 psi
What mixture concentricity of ethylene glycol to water provides maximum antifreeze protection? 100% 60% 30% 20%
60%
When water freezes, how much does it expand in volume? 2 percent 5 percent 9 percent 18 percent
9 percent
Which of the following pH readings taken in engine coolant fall in the normal range? 3.5 6.0 9.0 13.5
9.0
Which of the following could be handled by data bus communications in a current diesel engine cooling system thermostat opening A/C to fan-engage command coolant flow through heater core shutter cycling
A/C to fan-engage command
Which organization classifies all engine oils sold in North America? SAE API TMC ATA
API
What API oil classification is recommended for engines fueled by ultra low sulfur (ULS) fuel? CJ-4 CK-4 FA-4 All of the above
All of the above
Technician A says that CK-4 diesel engine lubricating oil is backward compatible with all previous diesel engine lube oil classifications. Technician B says that the digit 4, in FA-4 means that the oil is suitable for 4-stroke cycle use. Who is right? Technician A only Technician B only Both A and B Neither A nor B
Both A and B
Technician A says that engine lube analyses can be performed in truck service facilities with the advantage of producing immediate results. Technician B says that spectrographic analysis of engine lube is usually performed in a laboratory . Who is correct?
Both A and B
When a turbocharger is set up to impart drive torque to the crankshaft, which of the following terms describes the system? Series turbocharging Series-parallel turbocharging Compound turbocharging Paralleling
Compound turbocharging
Which of the following coolants boasts the longest service life? alcohol based coolant EG ELC PG
ELC
If a diesel engine is equipped with a diesel particulate filter (DPF) which of the following lube oil classifications is recommended? FA-4 CI-4 CF-4 GF-4
FA-4
What is the functional difference between C-EGR and I-EGR? C-EGR system run warmer I-EGR is managed within the cylinder head I-EGR costs more C-EGR systems must be managed by the engine ECM
I-EGR is managed within the cylinder head
What would be a typical maximum intake restriction specification for a turbocharged diesel engine? 15 inches H 2 O 15 inches Hg 25 inches H 2 O 25 inches Hg
N/A
Which organization grades engine oils by viscosity? SAE API TMC ATA
SAE
Technician A says that diesel engines equipped with water manifolds have more even actual cylinder temperatures. Technician B says that in engines not equipped with water manifolds, the cylinders closest to the radiator are likely to run warmer when the engine is at operating temperature. Who is correct? Technician A only Technician B only Both A and B Neither A nor B
Technician A only
Technician A says that highway diesel engines equipped with DPF should use a lube oil formulated to meet the API CJ-4 classification or later. Technician B says that FA-4 oil is backward compatible with all previous generations of diesel engine lube oils. Who is correct?
Technician A only
Technician A says that downflow radiators use a double pass flow principle. Technician B says that a counterflow radiator uses double pass flow routing. Who is correct? Technician A only Technician B only Both A and B Neither A nor B
Technician B onl
Technician A says that since the introduction of EGR on diesel engines, OEMs have greatly extended recommended oil change intervals. Technician B says that Cummins and Detroit Diesel factory fill their engines with FA-4 engine oil . Who is correct? Technician A only Technician B only Both A and B Neither A nor B
Technician B only
Technician A says that the first step to take when troubleshooting an engine overheating conditioning is to remove the radiator shroud to permit unimpeded air flow through the engine compartment. Technician B says that an engine overheat condition could be caused by a missing or damaged radiator shroud. Who is correct? Technician A only Technician B only Both A and B Neither A nor B
Technician B only
What term does Detroit Diesel use to describe their compound turbocharger on DD-series engines? variable geometry (VG) pulsed turbocharging direct drive turbocharging axial power turbine (APT)
axial power turbine (APT)
What should always be used to adjust fan belts? torque wrench fish weight scale belt dressing spray belt tension gauge
belt tension gauge
What causes wet liner cavitation? engine overheating engine lugdown bubble collapse air in coolant
bubble collapse
Which of the following is NOT an intake system component? charge air cooler air cleaner turbocharger catalytic converter
catalytic converter
When rebuilding a diesel engine water pump, which of the following components has to be handled with a great amount of care? steel impellers plastic impellers drive pulley ceramic seal
ceramic seal
Which of the following is NOT part of the exhaust system? catalytic converter turbocharger pyrometer charge air cooler
charge air cooler
What is an indication that engine oil has become contaminated with engine coolant? cloudy appearance greenish color reddish color darker in color
cloudy appearance
When the heat of combustion is transmitted through a diesel engine cylinder block, the principle is known as: conduction convection radiation evaporation
conduction
What is used in conjunction with an EGR system on most commercial diesel engines? water injection Roots blower tip turbine cooling heat exchanger
cooling heat exchanger
Which type of radiator uses a double pass principle? downflow crossflow counterflow upflow
counterflow
What should be used to measure the radial play of a turbine shaft? micrometer thickness gauges digital calipers dial indicator
dial indicator
Where would you most likely find a thermocouple pyrometer on a current highway diesel engine? 12-inches downstream from the turbo diesel particulate filter (DPF) exhaust gas recirculation (EGR) heat exchanger selective catalytic reduction (SCR) circuit
diesel particulate filter (DPF)
Which of the following does not conduct electricity ? distilled water EG ELC PG
distilled water
What is used as the cooling medium in heat exchangers known as aftercoolers and intercoolers? ram air engine coolant engine lubricant engine fan
engine coolant
What is the housing containing the muffler, catalytic converters, SCR, and diesel particulate filter (DPF) known as? exhaust pipe engine silencer resonator housing exhaust gas aftertreatment canister
exhaust gas aftertreatment canister
What type of engine oil pump is most commonly used on truck diesel engines? plunger vane external gear centrifugal
external gear
In which of the following applications is the use of a synthetic engine oil especially recommended? exceeding the OEM service intervals extreme cold weather operation dynamometer operation stationary operation
extreme cold weather operation
After running a diesel engine under heavy load, how long should the engine be idled before shutdown? one minute five minutes fifteen minutes thirty minutes
five minutes
In a sound absorption type muffler, what is sonic energy converted to? friction, then heat mechanical vibration pressure noise
friction, then heat
What type of filter is normally located in series immediately downstream from the oil pump? centrifugal bypass full flow cyclonic
full flow
What component rotates in the compressor housing of a turbocharger? impeller turbine turbine shaft shaft bearings
impeller
What is the pumping member of a diesel engine water pump rotor known as? propeller impeller turbo gerotor
impeller
Where is the lowest pressure usually found in a diesel engine cooling system? top radiator tank bottom radiator tank inlet to the water manifold inlet to the water pump
inlet to the water pump
Which of the following operating conditions is more likely to cause a diesel engine, catalytic converter to plug? light load, cold temperature operation high load, lugdown light load, rated speed operation high load, operation in torque rise
light load, cold temperature operation
Which of the following diesel engine operating conditions is more likely to result in cold sludging? engine overspeed high temperature operation high load, lugdown low load, low temperature operation
low load, low temperature operation
When an oil sample analysis indicates elevated levels of silicon, which of the following should be inspected first? oil pump main bearings turbocharger low pressure intake circuit for leaks
low pressure intake circuit for leaks
What type of filter is normally located in series immediately downstream from the oil pump? oil cooler main bearings valve seats fire rings
main bearings
When an oil analysis profile taken on a high mileage engine indicates higher than normal levels of copper, which of the following components would more likely be at fault? oil cooler main bearings valve seats fire rings
main bearings
Which of the following is NOT true of an extended life coolant (ELC)? no inhibitor testing required lasts for up to six years improves cavitation protection never has to be inspected
never has to be inspected
When a rain cap is used on a vertical exhaust stack, in which direction should the opening flap be pointed? forward rearward inside outside
outside
A filter that operates by forcing all of the engine oil it receives through the filtering media is known as: positive centrifugal bypass cyclonic
positive
The temperature at which an engine oil begins to gel is known as: flash point fire point pour point freeze point
pour point
Which of the following steps must be performed after installing a reconditioned turbocharger? check turbine endplay check turbine shaft radial play prime the turbo oil circuit replace the turbo studs
prime the turbo oil circuit
How does waterless engine coolant (WEC) protect against liner cavitation erosion? oxyalate additives provides vastly superior anti-boil properties boils at lower temperatures than EG gels on liner wall
provides vastly superior anti-boil properties
Which of the following is an example of a tuned diesel engine exhaust manifold? dedicated exhaust headers twin exhaust pipes pulsed manifolds wastegates
pulsed manifolds
What should be done to a bypass, luberfiner filter after changing the engine oil? clean with solvent clean with pressure washer purge air on start-up prime with used oil
purge air on start-up
When truck radiator hoses collapse internally as an engine cools, which of the following components should be checked out first? water pump radiator cap thermostat fanstat
radiator cap
Which of the following statements best describes how EGR functions to reduce NOx emissions? reduces oxygen intake to the engine routes HC into engine cylinder routes PM into engine cylinder cools down the intake charge
reduces oxygen intake to the engine
If a CJ-4 engine lubricating oil was used in place of an FA-4 oil, which of the following might result? exhaust valve damage turbocharger damage exhaust gas recirculation (EGR) system damage reduction in fuel efficiency
reduction in fuel efficiency
Which is the most accurate means of testing the antifreeze protection level of a coolant? hydrometer manometer litmus paper refractometer
refractometer
Which of the following properly defines viscosity? resistance to sheer resistance to flow resistance to heat resistance to solidification
resistance to sheer
Which sound dampening principle is based on sound waves being reflected back toward their source? absorption pulsation restriction resonation
resonation
When coolant is routed through the bypass circuit, which of the following is probable? engine is overheating thermostat is fully open thermostat is fully closed coolant is routed to the radiator
thermostat is fully closed
What two principles of fluid friction are used by an engine lubricating system? viscosity and viscosity index flash point and pour point thick film and boundary detergents and dispersants
thick film and boundary
What should be used to check gear side clearance when overhauling an oil pump? dial indicator outside micrometer snap gauges thickness gauges
thickness gauges
What is the science of friction and lubrication known as? physics tribology chemistry engineering
tribology
Which of the following components usually makes detailed tuning of diesel engine intake manifolds unnecessary? charge air cooler precleaner positive air cleaner turbocharger
turbocharger
When considering coolant cavitation erosion, what is a vapor bubble composed of? air vaporized coolant blow-by gas vaporized engine lube
vaporized coolant
What is the critical flow area inside the turbine housing of a turbocharger known as? diffuser impeller gate volute turbine outlet
volute
Which of the following components would be associated with a variable geometry turbocharger? wastegate pyrometer liquid cooling charge air cooling
wastegate
Which of the following components is not intended to function as a heat exchanger? radiator oil cooler water manifold air conditioning evaporator
water manifold
Which component in a truck cooling system requires that the coolant has some lubricating properties? water pump radiator shutters thermostat intercooler
water pump
