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


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1.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

2.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

3.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

4.單項(xiàng)選擇題When used in conjunction with a turbocharger, the main function of an after-cooler is to ()

A.increase the density of the cylinder air charge
B.prevent turbocharger overheating
C.liminate the need for a pre-cooler
D.remove moisture from air compressed by the turbocharger

5.單項(xiàng)選擇題One of function of diesel engine lubricating oil is to ()

A.induce carbon formation on cylinder walls
B.improve fuel penetration in the combustion space
C.form a friction reducing film between mating surfaces
D.lubricate the fuel injection

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() is not installed on the main switchboar.

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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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