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單項選擇題

The main source of fuel injection system malfunctions is （）

A.improper adjustments
B.contaminated fuel
C.coated fuel lines
D.excessive vibration

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單項選擇題

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

單項選擇題

If a main propulsion diesel engine hunts excessively at idle speed, you should （）

A.adjusts the idle speed control
B.drain and flushes the governor and replace the oil
C.adjusts the compensating needle valve