單項(xiàng)選擇題If water is found in the crankcase of a diesel engine, the cause may be due to（）

A.a cracked cylinder head
B.a leaky cylinder head gasket
C.a cracked cylinder liner
D.any of the above


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1.單項(xiàng)選擇題Following an overhaul of a crosshead type diesel engine, the engine is jacked over with the turning gear as part of the pre-start procedure, which of the listed pre-start procedures should be carried out?（）

A.Ensure proper cylinder lube oil flow
B.Open all air space drain cocks
C.Open all indicator valves
D.all of the above

2.單項(xiàng)選擇題Fuel oil is regularly transferred to the day tank in order to （）

A.allow impurities to settle out of the fuel
B.allow air to escape from the fuel
C.make fuel available for immediate use
D.all of the above

3.單項(xiàng)選擇題Starting air valves are held firmly on their seats by（）

A.cam rollers on the camshaft
B.spring force
C.air pressure on top of the valve differential piston
D.air pressure on the bottom of the valve differential piston

4.單項(xiàng)選擇題The depth of fuel oil in a tank is normally measured through the（）

A.vent line
B.overflow line
C.feed line
D.sounding tube

5.單項(xiàng)選擇題Which of the following methods is used to prevent throttling of compressed air through the diesel engine air starting valves?（）

A.Holding the valve open for a long period
B.Increasing the starting air pressure used
C.Opening the stating air valve quickly
D.Reducing the starting air valve size