單項選擇題Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）

A.Electric
B.Hydraulic
C.Air
D.All of the above


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1.單項選擇題In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）

A.build up the piston crown by metal spraying
B.build up the cylinder head by metal spraying
C.insert shims between the crankpin bearing box and the connecting rod foot
D.install a thinner head gasket

3.單項選擇題Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）

A.increase
B.decrease
C.remain the same
D.increase on compression decrease on expansion

4.單項選擇題With respect to diesel fuel, the ease with which a cold engine will start is dependent upon the（）

A.ignition quality of the fuel
B.high heating value of the fuel
C.amount of carbon residue after combustion
D.internal flow resistance in the injectors

5.單項選擇題A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）

A.has little or no internal friction
B.has a lower effective compression ratio
C.operates with scavenge air under a positive pressure
D.operates without energy absorbing intake and exhaust strokes