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单选题
How would the exhaust of a properly operating diesel engine appear?（）.
A
Light blue haze
B
Light brown haze
C
Light gray haze
D
Perfectly clear
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most critical in a four-stroke cycle diesel engineB
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单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
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单选题Forcing the exhaust gases form the cylinder of an operating diesel engine with the aid of a blower is known as （）A
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low sulfur content in the fuelB
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listen for combustion knock in that cylinderC
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单选题When would the available energy of the exhaust gases of a two-stroke/cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）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
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(1) onlyB
(2) onlyC
both (1) and (2)D
neither (1) nor (2)
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