单项选择题

A diesel engine cranks properly during starting but immediately stallsWhich of the following systems is most likely at fault?（）

A.Hydraulic starting
B.Electric starting
C.Ignition
D.Fuel

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单项选择题

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

单项选择题

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

单项选择题

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