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单选题
While engine is in operation the piston moves up and down, thus causing the rotation of the （）.
A
crankcase
B
slipper
C
cam housing
D
crankshaft
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单选题The piston moving up and down keeps the crankshaft （）.A
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考题
单选题The cylinder and piston must be warmed up （） to a temperature of about 140 degF in standing by engine.A
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have much to do with the operation of the engine and its lifeC
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inspection covers should not be opened until the engine has cooledB
ventilation system should be continued in operation for one hour for coolingC
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properly lubricatedC
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考题
单选题While engine is in operation the piston moves up and down, thus causing the rotation of the （）.A
crankcaseB
slipperC
cam housingD
crankshaft
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单选题Which statement about diesel engine combustion is true?（）A
Combustion does not begin until the piston starts down on the power strokeB
Maximum combustion pressure is reached before TDCC
Turbulence in the cylinder causes a delay in ignitionD
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单选题The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the （）.A
camshaftB
reduction gearsC
rocker armD
connecting or piston rod
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The tracking return code fails after the SLA operation results in an ICMP echo failure three times.B
The tracking return code fails after the SLA operation results in an ICMP echo failure one time.C
After the tracking object fails, the tracking o bject moves back to an up state 45 seconds later in all cases.D
After moving to a down state, the tracking object moves back to an OK state 45 seconds after the SLA operation moves to an OK state.
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单选题The piston moves up and down, thus causing the rotational movement of the（）A
crankshaftB
connecting rodC
cross-headD
main beating
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单选题The function of diesel engine piston compression rings is to （）.A
prevent piston side thrustB
prevent engine friction lossesC
transmit heat from the piston to the cylinder linerD
remove oil from the cylinder combustion space
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单选题Which of the following problems would be the probable cause for the faulty operation of a reciprocating air compressor suction valve?（）A
Carbon build up in the piston ring beltB
Faulty operation of a cylinder un-loaderC
Compressor operation in an area of high relative humidityD
Lifting of intercooler rebel valve
考题
单选题The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.A
the same pistonB
the piston nearbyC
the other pistonsD
the generators on board
考题
单选题In slow speed two-stroke engines,（）the fresh air entering begins when and stops as（）A
the inlet port is opened by the up coming piston； the port is closed by the down goingB
the inlet valve is opened by the down going piston；the inlet valve is closedC
the inlet port is opened by the down going piston；the port is closed by the up comingD
the inlet valve is opened
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