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单选题
Pyrometers commonly found on diesel engine exhaust systems, consist of（）
A
pyrostats and a voltmeter
B
a gas-filled bellows, a tube and a pressure gauge
C
thermocouples and a voltmeter
D
ammeters and thermocouples
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the engine is overloadedB
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provide exhaust back pressureB
prevent exhaust smoke emissionsC
power a reciprocating superchargerD
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单选题The size of the exhaust valve opening is （）A
most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
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考题
单选题Exhaust gas pyrometers are useful for（）A
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adjusting fuel racks to maintain equal loading between cylindersC
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单选题The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually（）A
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单选题Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening （）A
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later and closing laterC
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单选题In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）A
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sulfuric acid corrosionC
surface pitting of the turbochargerD
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decreasing the temperature of the exhaust gasesD
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low exhaust back pressureC
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DSD
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单选题If you observe smoke coming from the turbocharger of an auxiliary diesel engine, you should（）A
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check for an exhaust leakC
check the exhaust temperatureD
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考题
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check cylinder lubricationB
connect the pressure indicator pressureC
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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
考题
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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