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单选题
In a diesel engine, a positive displacement type blower is usually （）
A
gear drive by the engine
B
driven by an exhaust gas turbine
C
driven by a camshaft
D
driven by separate motor
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单选题Which of the listed pumps is NOT a positive displacement pump?（）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
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单选题A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longerA
(1) onlyB
(2) onlyC
both (1) and (2)D
neither (1) nor (2)
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