單項選擇題One cause of diesel engine surging can be a result of ()

A.injection pump plungers stuck or worn
B.low compression
C.solenoid stuck open
D.fuel tank too full


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1.單項選擇題Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to()

A.facilitate bi-directional operation
B.provide the greatest pump efficiency
C.prevent pump clogging from marine growth
D.prevent cavitation at the pump outlet

2.單項選擇題In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the ()

A.raw water pump discharge
B.expansion tank outlet
C.cooling water heat exchanger
D.outlet engine jacket water outlet

3.單項選擇題

In a diesel engine, a cylinder liner should be replaced if it is ()
Ⅰ.Scuffed
Ⅱ.Scored

A.Ⅰ only is correct
B.Ⅱ only is correct
C.both Ⅰ and Ⅱ are correct
D.neither Ⅰ or Ⅱ are correct

4.單項選擇題Under normal conditions, the main source of crankcase oil contamination is attributed to ()

A.metal particles loosened by wear
B.air when air cleaners are not used
C.condensation of water vapors
D.breakdown of the lubricating oil by dilution

5.單項選擇題Valve cages are used on some large diesel engines to ()

A.reduce wear on the valve stem
B.permit the use of alloy valve seat materials
C.reduce heat transfer from the valve seat
D.facilitate valve removal for servicing