单项选择题White smoke exhausting from an operating diesel engine may indicate ()

A.a cracked liner
B.burning lube oil
C.an overloaded engine
D.insufficient combustion air


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1.单项选择题The over-speed trip installed on most diesel engine will stop the engine by shutting off the ()

A.water supply
B.fuel oil supply
C.lube oil supply
D.exhaust damper

2.单项选择题The blower type crankcase ventilation system ()

A.removes combustible gases in the crankcase
B.prevents the formation of combustible gases in the crankcase
C.cools lubricating oil
D.improves cold weather starting

3.单项选择题One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to ()

A.increase scavenge air pressure
B.reduce fuel booster pump pressure
C.adjust the fuel rack
D.retard fuel injector timing

4.单项选择题What is the best way of stopping an over-speeding diesel engine?()

A.Disconnect the battery cables from the starting motor
B.Drain the hydraulic fluid from the governor sump
C.Block the flow of cooling air to the radiator
D.Secure the fuel supply and block the air intake

5.单项选择题The efficient burning of fuel in a diesel engine is dependent upon the ()

A.temperature of compression
B.atomization of the fuel
C.penetration of the fuel
D.all of the above

6.单项选择题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of ()

A.low loading of that cylinder
B.faulty combustion in that cylinder
C.sluggish piston ring action
D.excessive piston cooling

7.单项选择题Engine coolant accumulating in the diesel engine lubricating oil can result from a ()

A.low oil pressure
B.high coolant pressure
C.leaking fuel injector
D.cracked cylinder head or liner

8.单项选择题The device used to limit engine torque at various engine speeds is called a ()

A.speed limiting governor
B.variable speed governor
C.constant speed governor
D.load limiting governor

9.单项选择题A fuel leak occurs in the high pressure fuel piping between the injection pump and fuel nozzleThis requires immediate repair because of the ()

A.high cost of fuel
B.serious fire hazard
C.possibility of pollution
D.poor combustion which will occur in that cylinder

10.单项选择题Lube oil accumulating in the cooling water system of a diesel engine will result in ()

A.lube cooler failure
B.poor heat transfer
C.mechanical lubricator failure
D.camshaft seizure