單項選擇題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


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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題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