單項選擇題

Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in （）

A.an air bound fuel system
B.damage to cylinder heads and pistons
C.excessive fuel injection
D.excessive air valve lift

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Heat damage to fuel injection nozzles can be prevented by avoiding （）

A.excessive fuel oil temperature
B.long periods of engine overload
C.metallic contact between nozzles and cylinder heads
D.hard carbon deposit and varnish on the nozzles

單項選擇題

Critical speed in diesel engines occurs when engine torque pulsations become （）

A.opposed to the crankshaft rocking couple
B.resonant with the crankshaft natural frequency
C.critical fore and aft crankshaft vibrations
D.horizontal whipping motions of the crankshaft