單項(xiàng)選擇題The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）

A.pumping action of the piston
B.pressure of the fuel charge
C.vacuum developed in the manifold
D.pressure of the fresh air charge


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1.單項(xiàng)選擇題Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?（）

A.Electric power and starting air
B.Lube oil standby pump and control air
C.Hydraulic switch and engage jacking gear
D.Motor drain and pneumatic control system power

2.單項(xiàng)選擇題A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）

A.engine overload
B.leaky valves
C.stuck or broken piston rings
D.low air injection pressure

3.單項(xiàng)選擇題Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?（）

A.Corrosion and eventual failure of the tank
B.Gumming of the tank relief valves
C.Immediate failure of components downstream of the compressed air system
D.Boiling of the water oil mixture as pressure is reduced

4.單項(xiàng)選擇題During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）

A.effective cylinder scavenging and cooling
B.constant pressure from the turbochargers
C.cooler operation of the exhaust system
D.effective constant pressure for turbocharger operation

5.單項(xiàng)選擇題Which of the listed diesel engine systems is likely to create the problem of a cylinder regularly misfiring?（）

A.Lubrication
B.Cooling
C.Fuel
D.Electric ignition