單項選擇題“Before disconnecting the oil pipe, would you flush the oil retained in the pipe?” asked the oil barge owner （）

A．by using of fresh water
B．with compressed air
C．by using of sea water
D．with chemical compound


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1.單項選擇題For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.

A.it has a longer power stroke
B.more air gets into the cylinder each stroke
C.it develops twice as many power strokes at the same speed
D.higher combustion pressure is developed

2.單項選擇題A thrust bearing is used with a propulsion diesel engine to （）.

A.control axial movement of the crankshaft
B.transmit engine thrust to the propeller shaft
C.absorb vibrations in the propeller shafting
D.prevent propeller thrust from being transmitted to the hul

4.單項選擇題When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）

A.During operation at low speed
B.During operation at rated speed, but low power output
C.During acceleration
D.All of the above

5.單項選擇題A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.

A.reduce the engine load
B.increase the cooling water flow
C.increase the lube oil pressure
D.adjust the fuel rack

6.單項選擇題The ability of the governor to prevent fluctuations in engine speed is termed （）.

A.sensitivity
B.stability
C.promptness
D.speed droop

7.單項選擇題In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.

A.two crankshaft revolutions in a two-stroke/cycle engine
B.two power strokes in a two-stroke/cycle engine
C.one power stroke in a two-stroke/cycle engine
D.two piston strokes in a two-stroke/cycle engine

8.單項選擇題Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.

A.under high pressure
B.under low pressure
C.heated to reduce viscosity
D.cooled to increase viscosity

9.單項選擇題Lube oil cannot be efficiently filtered if its （）.

A.viscosity is too low
B.temperature is too low
C.pump discharge pressure is higher than the systems pressure
D.pump capacity is greater than the systems needs

10.單項選擇題Proper filtering and straining of fuel oil is important because the （）.

A.fuel oil pump will over-speed if dirt is not removed
B.fuel oil transfer pumps cannot tolerate small amounts of dirt in the oil
C.fuel injectors may be damaged by foreign particles in the fuel oil
D.dirty fuel will clog the intake air filter