單項(xiàng)選擇題If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number, the （）.

A.acidity has increased
B.viscosity has decreased
C.demulsibility has improved
D.foaming is guaranteed to occur


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1.單項(xiàng)選擇題When an auxiliary boiler is panting and emitting black smoke, you should （）.

A.increase the fuel oil temperature
B.decrease the fuel oil temperature
C.decrease the fuel oil supply pressure
D.increase the air supply

2.單項(xiàng)選擇題

With regards to a diesel engine crankcase explosion, the most violent is the（）
(1) primary explosion
(2) secondary explosion

A.(1) only
B.(2) only
C.both (1) and (2)
D.neither (1) or (2)

3.單項(xiàng)選擇題Waterside scale in a fire-tube boiler may cause （）.

A.increased heat transfer
B.fireside erosion
C.high steam demand
D.overheated tubes

4.單項(xiàng)選擇題The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.

A.gas composition
B.gas temperature
C.pressure
D.timing

5.單項(xiàng)選擇題Camshafts are usually driven by timing gears or （）.

A.push rods
B.chain drives
C.rocker arms
D.flywheels