單項(xiàng)選擇題If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）

A.on the power stroke
B.on the exhaust stroke
C.at the end of the power stroke
D.at the start of the intake stroke


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1.單項(xiàng)選擇題Low cylinder compression pressure and a high exhaust temperature may indicate （）

A.early fuel injection timing
B.leaking valves
C.a continuously open scavenge air port
D.low cooling water temperature

2.單項(xiàng)選擇題Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）

A.clogged air filter
B.compression stroke
C.burned exhaust valves
D.all of the above

4.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

5.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