單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題A spring-loaded centrifugal flyweight governor responds to reduced engine load with an immediate increase in （）

A.pilot valve oil pressure
B.speeder spring force
C.compensation needle valve clearance
D.centrifugal force on the flyweights

5.單項選擇題In order to start a large, low-speed, main propulsion diesel engine on high viscosity fuel after an extended shutdown, the （）

A.fuel must be preheated
B.intake air should be preheated
C.lube oil outlet temperature should be increased 20℃ above normal
D.none of the above