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单选题
High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
A
decreased piston to cylinder head clearance
B
increased exhaust system back pressure
C
early fuel injection timing
D
low scavenge air temperature
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单选题Which of the conditions listed would cause simultaneous high cylinder firing pressure and low exhaust temperature?（）A
Improper fuel rack positioningB
Lengthy opening of the exhaust valveC
Excessively early injection timingD
Extended light load operation
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单选题Late fuel injection timing is indicated by （）A
lower than normal cylinder pressure and low exhaust temperatureB
lower than normal cylinder pressure and high exhaust temperatureC
higher than normal cylinder pressure and low exhaust temperatureD
higher than normal cylinder pressure and high exhaust temperature
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单选题Early injection timing is indicated by （）.A
high exhaust temperature and low firing pressureB
high exhaust temperature and high firing pressureC
low exhaust temperature and low firing pressureD
low exhaust temperature and high firing pressure
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high temperature and a high viscosityB
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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
Low compression pressure and high exhaust temperatureB
Low firing pressure and high exhaust temperatureC
Low compression pressure and low exhaust temperatureD
Low firing pressure and low exhaust temperature
考题
单选题Low cylinder compression pressure and a high exhaust temperature may indicate （）A
early fuel injection timingB
leaking valvesC
a continuously open scavenge air portD
low cooling water temperature
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单选题Fusible plugs are installed in fire-tube boilers to （）.A
provide a means of draining the boilerB
warn the engineer of low water levelC
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单选题Leaky exhaust valve will result in which of the following?（） (1) high exhaust temperature; (2) low compression pressure; (3) low firing pressure.A
(1) and (2)B
(1) onlyC
(2) onlyD
(1),(2) and (3)
考题
单选题Either a low injection pressure or a leakage of piston rings is able to lead （）.A
a high exhaust temperatureB
a high smoky exhaustC
a high outputD
a high compression
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单选题Which of the listed set of conditions indicates early fuel injection timing?（）A
Loss of engine power and high exhaust temperaturesB
Higher than normal firing pressure and low exhaust temperaturesC
High fuel consumption and high exhaust temperaturesD
Lower than normal compression pressure and high exhaust temperature
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单选题Late fuel injection in a diesel engine is indicated by low firing pressure with（）A
high exhaust temperatureB
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单选题If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）A
early injection timingB
worn orifices in the injection nozzlesC
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单选题All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are lowWhich of the following situations is responsible for this condition?（）A
Excessively early injection timingB
Combustion knockC
Leaking piston ringsD
Light load
考题
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
retard fuel injector timing
考题
单选题Late fuel injection in a diesel engine is indicated by low firing pressure with （）A
low exhaust temperatureB
low exhaust pressureC
mechanical knock in each cylinderD
black or gray exhaust smoke
考题
单选题High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）A
improper fuel rack positingB
lengthy exhaust valve durationC
extend operation at light loadD
excessively early injection timing
考题
单选题An indication of a diesel engine air intake being partially clogged, is （）.A
low firing pressure and low exhaust temperaturesB
low firing pressure and normal exhaust temperaturesC
high firing pressure and low exhaust temperaturesD
high firing pressure and high exhaust temperatures
考题
单选题If a diesel engines exhaust temperature is abnormally high, the cause could be（）A
too light of a loadB
injection timing is too earlyC
overloading of the engineD
too low of a compression ratio
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