Diesel engine mufflers accomplish noise reduction by _____.
A.reducing exhaust gas velocity
B.increasing the frequency of gas vibration
C.the use of long head pipes
D.the use of zinc electrodes
第1题
The diesel engine is also called compression ignition engine because______.
A compression stroke is one of the four-strokes of a diesel engine.
B the diesel engine is ignited by the heat of compression not by spark .
C the diesel engine has a very high compression ratio.
D Both A and B
第2题
The crankshaft of diesel engine is supported by _____.
A.tension stretch
B.tie rods
C.through bolts
D.main bearings
第3题
In four-stroke diesel engine, the cycle of events is completed in () of crankshaft.
A.one revolution
B.two revolutions
C.four revolutions
第4题
As a heat engine, () energy is the source of power by which a diesel enginecan be operated.
A.heat
B.electric
C.light
第5题
A the air is compressed in the sealed cylinder in the diesel engine
B the petrol engine has a comparatively very low compression ratio
C combustion occurs by spark ignition in the diesel engine
D Both A and B
第8题
The diesel engine is a type of _____.
A.turbine engine
B.gas turbine
C.steam engine
D.internal combustion engine
第9题
Defective air cooler in a diesel engine will lead to .
A.smoky exhaust
B.starting failure
C.overload
D.over speed
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