單項(xiàng)選擇題Lubricating oil viscosity in an operating diesel engine can be reduced by（）

A.increasing cooling water flow
B.increasing lube oil flow
C.dilution by fuel oil
D.adding SAE 70 oil


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1.單項(xiàng)選擇題A defective injector nozzle in a propulsion diesel engine can cause（）

A.engine power losses
B.smoking due to unburned fuel
C.high exhaust temperature readings
D.all of the above

2.單項(xiàng)選擇題The major cause of problems occurring with fuel injection equipment is（）

A.incorrect replacement of barrels and plungers of jerk pumps
B.overheating of the nozzle orifices
C.cracked pump housings
D.dirt in the fuel

4.單項(xiàng)選擇題Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）

A.employing fuel oil as a cooling medium
B.preventing hard carbon deposit on nozzle tips
C.avoiding fuel oil temperature exceeding builder’s specification
D.ensuring good metallic contact between nozzles and cylinder heads

5.單項(xiàng)選擇題One of the advantages in the use of a dry liner over a wet liner is（）

A.it is fitted with neoprene O-ring seals
B.the honing process makes it easier to maintain the desired oil film
C.there is likelihood of water leaking into the combustion space
D.it fits more loosely due to a decrease in heat transfer through the composite wall