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单选题
How are the pressure and temperature affected in a diesel engine cylinder during compression?（）
A
Pressure and temperature decrease
B
Pressure and temperature increase
C
Pressure decreases and temperature increases
D
Pressure increases and temperature decreases
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an increase in the exhaust temperature of the affected cylinderB
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单选题The vapor pressure of a substance（）.A
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单选题What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?（）A
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Rapid increase in volume and decrease in pressure
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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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Low firing pressure and high exhaust temperatureC
Low compression pressure and low exhaust temperatureD
Low firing pressure and low exhaust temperature
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单选题High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by （）.A
engine overloadB
low combustion temperatureC
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单选题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）A
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carrying the expansion tank water level too highC
a totally clogged impeller in the cooling water pumpD
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单选题Large, two-stroke/cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the （）.A
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单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）A
sea water temperature must never be warmer than 40℃B
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jacket water pressure must always be less than the sea water pressure
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lower boiling temperature for a given pressure than does a pure refrigerantC
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cylinder compression temperature may be too highC
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单选题Thermostatic expansion valves can be adjusted for （）.A
suction pressure onlyB
head pressure onlyC
superheat onlyD
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单选题Bad valves operation of the reciprocating air compressors can be detected by observation of （）.A
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单选题Cloud formations are minimal when the（）.A
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单选题Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）A
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单选题What monitoring device best indicates the load being carried by a diesel engine?（）A
Lube oil pressure gaugeB
Jacket water temperature gaugeC
TachometerD
Exhaust pyrometer
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单选题When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）A
maintain higher than normal jacket water temperatureB
change the lube oil more frequently than normalC
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maintain a higher air-box pressure than normal
考题
单选题After a cold front passes，the barometric pressure（）.A
drops，and the temperature dropsB
drops，and the temperature risesC
rises，and the temperature dropsD
rises，and the temperature rises
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