單項(xiàng)選擇題When fuel is injected in a diesel engine cylinder too early, ()

A.ignition may be delayed
B.fuel economy is not affected
C.exhaust gas temperature will be unchanged
D.the exhaust will be clear


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1.單項(xiàng)選擇題The purpose of an after-cooler is to()

A.reduce the turbocharger operating temperature
B.increase the pressure of the inlet air
C.increase the density of the inter air
D.reduce the blower operating temperature

2.單項(xiàng)選擇題Early fuel injection timing is indicated by the cylinder pressure being()

A.above normal with a below normal exhaust temperature
B.above normal with a normal exhaust temperature
C.below normal with a normal exhaust temperature
D.below normal with an above normal exhaust temperature

3.單項(xiàng)選擇題Critical speeds occurring within the operating speed range of a main propulsion diesel engine may be changed, or have their damaging effects reduced by a/an ()

A.engine support vibration isolator
B.detuner or viscous fluid damper
C.lightened crankshaft flywheel
D.spherically seated crankshaft bearing

4.單項(xiàng)選擇題Performance of a turbocharged engine can be improved by()

A.decreasing the amount of valve overlap
B.preheating the air intake
C.after-cooling the intake air
D.preheating light fuel

5.單項(xiàng)選擇題Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?()

A.Planetary gear set
B.Torsional vibration damper
C.Friction clutch
D.Air bladder clutch

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Which one is NOT the ‘clear grounds’ for a more detailed inspection?()

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The treatment of the fuel oils involves storage, heating, filtering and()

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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()

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During the diesel engine running, the water level of F.W expansion tank should normally kept in the () level of glass tube.

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As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?()

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()are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

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The additional mark ()in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

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Cold weather starting of a diesel engine may be made easier by()

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By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a()

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