13.Fuel droplets injected into a diesel engine cylinder must have adequate penetration to _____________.

A.prolong the ignition delay period
B.ensure the beginning of fuel injection
C.thoroughly utilize the air charge
D.allow controlled fuel combustion

C.thoroughly utilize the air charge

14.Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an _____________.

A.overspeed trip

B.audible/visual alarm

C.the ships/boats general alarm

D.reserve oil storage tank

B.audible/visual alarm

15.The amount of fuel injected into a cylinder by a unit injector is controlled by _____________.

A.the firing pressure in the cylinder

B.a metering helix

C.varying the length of the plunger stroke

D.varying the clearance between the injector cam and the injector rocker arm


B.a metering helix

16.The dripping of fuel from an injector nozzle after injection terminates, often results in ____________.

A.early combustion

B.incomplete combustion and decreased fuel consumption

C.coking and blocking of the fuel nozzles

D.decreased cylinder wall temperatures and increased exhaust gas temperatures


C.coking and blocking of the fuel nozzles

17.The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load. Which of the following statements describes this requirement?

A.Proper timing

B.Accurate metering

C.Suitable injection rate

D.Suitable atomization rate


B.Accurate metering

18.The knock occurring when a cold diesel engine is started and continues while running at low speed, but stops when the engine reaches normal operating speed and temperature, is _________________.

A.caused by retarded injection timing

B.caused by a mechanical defect in one cylinder

C.caused by high fuel injection pressures

D.normal for these conditions

D.normal for these conditions

19.The most crucial time for any bearing with regards to lubrication is _____________.

A.during low loads

B.after proper oil viscosity is reached

C.during starting

D.after cleaning filters

C.during starting

20.Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?

A.Exhaust temperature

B.Lube oil level

C.Lube oil pressure

D.Water level in the expansion tank

C.Lube oil pressure

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