單項(xiàng)選擇題Which of the turbo-charging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?（）

A.Constant pressure
B.Pulse
C.constant velocity
D.Axial flow


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1.單項(xiàng)選擇題Which of the following problems will occur if the needle valve in a fuel injection nozzle sticks in the open position?（）

A.Fuel injection timing will change
B.Nozzle operation will be unaffected
C.Fuel will leak into the drain line
D.Fuel will not be delivered

2.單項(xiàng)選擇題A dry-type exhaust muffler clogged with soot, will cause（）

A.low exhaust temperature
B.loss of engine power
C.burned intake valves
D.engine racing

3.單項(xiàng)選擇題An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）

A.restricted turbocharger air intake
B.oil leak into the turbocharger
C.dribbling injector
D.low fuel viscosity

4.單項(xiàng)選擇題

The exhaust valve opens before bottom dead center in a four stroke engine to（）
Ⅰ.allow for blow down
Ⅱ.Reduce pumping losses

A.Ⅰ only
B.Ⅱ only
C.both Ⅰ and Ⅱ
D.neither Ⅰ nor Ⅱ

5.單項(xiàng)選擇題Which of the turbo-charging systems listed operates with the least average back pressure in the exhaust manifold?（）

A.Constant volume
B.Constant pressure
C.Pulse pressure
D.Radial flow