1.A loose crosshead plunger assembly in a metering or proportioning pump will cause _____________.
A.rapid wear on the crosshead

B.damage to the stroke adjustment arm
C.rapid wear on the plunger packing

D.damage to the pressure compensator valve

C.rapid wear on the plunger packing

2.In a naturally aspirated diesel engine, the volume of air intake is directly related to engine ________________.

A.compression ratio

B.valve size

C.fuel pressure

D.cylinder clearance volume


B.valve size

3.A naturally aspirated diesel engine at full throttle will have an intake manifold pressure ____________.

A.slightly less than atmospheric pressure
B.approximately equal to exhaust manifold pressure at all times

C.that is widely fluctuating

D.constantly decreasing as engine load increases

A.slightly less than atmospheric pressure

4.An increase in the air inlet manifold pressure of a diesel engine will result in a/an ____________.

A.decrease in maximum cylinder pressure

B.increase in ignition lag

C.decrease in fuel consumption per kilowatt-hour

D.decrease in exhaust manifold pressure

C.decrease in fuel consumption per kilowatt-hour

5.On a large diesel engine installation, crankshaft axial alignment is maintained by the ______________.

A.piston rod guides

B.engine thrust bearing

C.crosshead bearing

D.main shaft flexible coupling

B.engine thrust bearing

6.The crankcases of many diesel engines are kept under a slight vacuum to _____________.

A.improve fuel economy

B.increase the air charge velocity

C.reduce the risk of explosion

D.all of the above

C.reduce the risk of explosion

7.Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the ________________.

A.air charge density becoming too high

B.piston crown surfaces becoming too cold

C.formation of excessive quantities of condensate

D.compression pressure being greatly reduced

C.formation of excessive quantities of condensate

8.On a turbocharged, medium-speed, diesel engine, which of the following problems is an indication of a restricted air intake passage?

A.engine is hard to start

B.engine misses

C.surges at governed RPM

D.coolant temperature is too low


A.engine is hard to start

9.An indication of a diesel engine air intake being partially clogged, is ____________.

A.low firing pressure and low exhaust temperatures

B.low firing pressure and normal exhaust temperatures

C.high firing pressure and low exhaust temperatures

D.high firing pressure and high exhaust temperatures

B.low firing pressure and normal exhaust temperatures

10.Load control on a diesel engine is accomplished by _____________.

A.regulating the speed of the turbocharger

B.rotating the fuel injector pump plunger

C.regulating the speed of the fuel oil transfer pump

D.changing engine timing


B.rotating the fuel injector pump plunger

11.Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause _____________.

A.the formation of sulphuric acid

B.a decrease in lube oil viscosity

C.a decrease in cooling water pH

D.a thermostat failure

A.the formation of sulphuric acid

12.The air supplied to a diesel engine is compressed to___________.I. provide heat for the ignition of the fuel II. decrease injection delay

A.I only is correct

B.II only is correct

C.both I and II are correct

D.neither I or II are correct

A.I only is correct

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