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单选题
The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）
A
inlet nozzle ring
B
turbine wheel blade
C
diffuser passages
D
inlet vol
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The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the_______.A.inlet nozzle ringB.turbine wheel bladeC.diffuser passagesD.inlet volute
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单选题（）are supplied by main switchboard directly.A
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leaking valvesC
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decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
early fuel injection timingD
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increasing the linear velocity of the exhaust gasesB
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单选题One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）A
increase scavenge air pressureB
reduce fuel booster pump pressureC
adjust the fuel rackD
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单选题Air compressor cylinder un-loaders enable the compressor to （）.A
vary their speed according to temperature and loadB
start and come up to speed before air compression beginsC
change speed according to overload demandsD
reduce compressed air charge density
考题
单选题A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.A
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单选题An indication of a diesel engine air intake being partially clogged, is （）.A
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单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
a modern diesel engine；a turbine wheelB
a modem diesel engine；exhaust gasesC
a compressor；an exhaust gas turbochargerD
a compressor；a turbine wheel
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