單項選擇題Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）

A.water in the fuel
B.insufficient fuel for combustion
C.clogged air intake passages
D.burning lubricating oil


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1.單項選擇題Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in （）

A.increased horsepower
B.reduced efficiency
C.increased heat loss
D.lower cylinder pressures

2.單項選擇題An emergency diesel generator should automatically shut down in the event of （）

A.dangerous over-speeding
B.a loss of lube oil pressure
C.activation of the fixed CO2 system for the emergency generator space
D.all of the above

3.單項選擇題The purpose of the flywheel is to （）

A.provide energy to operate the engine between power impulses
B.neutralize the primary inertia force of the crankshaft
C.reduce the shock of starting loads on the main bearings
D.prevent the engine from operating at critical speed

5.單項選擇題Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）

A.cylinder valves
B.compression rings
C.piston skirts
D.oil rings