单项选择题

A knocking sound from one cylinder of an operating air compressor indicates （）.

A.a defective or broken high pressure un-loader
B.a loose valve plate
C.excessive overload
D.no compression

相关考题

Rotation of the steering wheel on the navigation bridge...

单项选择题Rotation of the steering wheel on the navigation bridge initiates oil pressure being applied to the steering gear rams by （）.

A.regulating the oil flow with the six-way valve
B.moving the automatic differential valve
C.moving the receiving tele-motor which regulates the two-way valve
D.varying the angle of a tilting box or eccentricity of a floating ring

Which characteristic or condition will have the greates...

单项选择题Which characteristic or condition will have the greatest effect on increasing a hydraulic oils viscosity?（）

A.Pour point
B.Cloud point
C.Vacuum
D.Pressure

When there is no movement of the rams on an electro-hyd...

单项选择题When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is （）.

A.set for maximum torque
B.on the purge and vent stroke
C.in the neutral position
D.rotating backwards

船舶辅助机械

A knocking sound from one cylinder of an operating air compressor indicates （）.