單項選擇題If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in ()

A.a low level in the engine expansion tank
B.excessively high coolant pressure
C.improper temperatures
D.malfunctioning of the jacket water heater


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1.單項選擇題Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?()

A.To allow for greater expansion due to higher operating temperature
B.To seal the cylinder against leakage of combustion gases
C.To provide an additional surface for oil cooling
D.To provide an additional strength for the crown and lower structure

2.單項選擇題The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the ()

A.fuel delivery pressure
B.pump plunger diameter
C.plunger control rack position
D.total pump stroke

3.單項選擇題The upper section of a piston is called the ()

A.land
B.skirt
C.crown
D.plate

4.單項選擇題Pitted reduction gear teeth having a deep blue color with evidence of overheating have been operated with ()

A.excessive speed
B.improper warm-up
C.extreme misalignment
D.inadequate lubrication

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As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()

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The additional mark ()in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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() is not installed on the main switchboar.

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To shut down a diesel engine after it exceeds the set maximum speed,which type of device listed should be used?()

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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()

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