單項(xiàng)選擇題When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）

A.intake stroke
B.compression stroke
C.power stroke
D.exhaust stroke


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1.單項(xiàng)選擇題Which of the general advantages listed does the electrical pyrometer have over the mechanical pyrometer?（）

A.When heated, it will move proportional to the amount the metal has lengthened or expanded
B.The pointer associated with the pyrometer scale can be made to also measure engine RPM
C.It can be utilized in exhaust manifolds and heat exchangers interchangeably
D.It can indicate temperature at a distant point from the source heat

2.單項(xiàng)選擇題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 temperature
B.Low firing pressure and high exhaust temperature
C.Low compression pressure and low exhaust temperature
D.Low firing pressure and low exhaust temperature

3.單項(xiàng)選擇題Excessive valve lash in an auxiliary diesel engine will cause the valves to open（）

A.later and close sooner
B.sooner and close later
C.sooner and close sooner
D.later and close later

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題Low compression in a diesel engine can be caused by （）

A.clogged coolant passages
B.a leaking cylinder head gasket
C.low fuel oil pressure
D.worn or broken cylinder liner sealing rings