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

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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
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单项选择题

Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?（）

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D.Boiling of the water oil mixture as pressure is reduced