單項(xiàng)選擇題Which of the listed set of conditions indicates early fuel injection timing?（）

A.Loss of engine power and high exhaust temperatures
B.Higher than normal firing pressure and low exhaust temperatures
C.High fuel consumption and high exhaust temperatures
D.Lower than normal compression pressure and high exhaust temperature


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1.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

2.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

3.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

4.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

5.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