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
2.In a naturally aspirated diesel engine, the volume of air intake is directly related to engine ________________.
D.cylinder clearance volume
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
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
5.On a large diesel engine installation, crankshaft axial alignment is maintained by the ______________.
A.piston rod guides
B.engine thrust bearing
D.main shaft flexible coupling
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
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
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
C.surges at governed RPM
D.coolant temperature is too low
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
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
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
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