单项选择题
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
Which of the listed items should be secured before perf...
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
A diesel engine experiences a sudden loss in speed, acc...
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
Which of the following problems can occur if you contin...
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?（）
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
