In a diesel engine, exhaust valves open before the intake ports are uncovered to （）
Ⅰ.reduce pumping losses
Ⅱ.reduce back pressure
A.Ⅰonly
B.Ⅱonly
C.bothⅠand Ⅱ
D.neitherⅠnor Ⅱ
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A.Intake manifold
B.Water-cooled exhaust system
C.After-cooler
D.Exhaust diffuser
A.fuel will not be properly atomized in the cylinder
B.ignition will be delayed due to low ignition temperature
C.maximum fuel expansion will occur on the compression stroke
D.fuel will ignite before top dead center
A.air compressor
B.diffuser
C.after-cooler
D.ventilator
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
A.ignition may be delayed
B.fuel economy is not affected
C.exhaust gas temperature will be unchanged
D.the exhaust will be clear
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
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
A.engine support vibration isolator
B.detuner or viscous fluid damper
C.lightened crankshaft flywheel
D.spherically seated crankshaft bearing
A.decreasing the amount of valve overlap
B.preheating the air intake
C.after-cooling the intake air
D.preheating light fuel
A.Planetary gear set
B.Torsional vibration damper
C.Friction clutch
D.Air bladder clutch
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