單項(xiàng)選擇題With supercharging a larger mass of air is supplied to the cylinder by blowing it in under pressure, which is the best means to （） of the engine.

A.increase the exhaust temperature
B.increase the power of
C.reduce the speed
D.increase the fuel consumption


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1.單項(xiàng)選擇題Whilst the engine is turning, check to see that no water is leaking into the crankcase, scavenge air belt, or from （）.

A.exhaust valves
B.starting valves
C.fuel valves
D.the indicator cocks

2.單項(xiàng)選擇題While engine is in operation the piston moves up and down, thus causing the rotation of the （）.

A.crankcase
B.slipper
C.cam housing
D.crankshaft

3.單項(xiàng)選擇題Which of the following would cause a diesel to have black smoke?（）

A.leaky injector
B.water in the gas
C.too heavy oil
D.water in the oil

4.單項(xiàng)選擇題Which of the following will take place if the clearance of the main bearings are excessive?（）

A.bearing knocks
B.dropping of pressure of LO
C.noises
D.all the above

5.單項(xiàng)選擇題Which of the following will be the function of lubricating oil used in marine engines?（）

A.to remove heat from oil cooled pistons
B.to wash away wear detritus
C.to neutralize acidic products
D.all of the above