A.Pour point
B.Cloud point
C.Vacuum
D.Pressure
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A.set for maximum torque
B.on the purge and vent stroke
C.in the neutral position
D.rotating backwards
A.frames
B.joiners
C.longitudinals
D.knees
A.pump bearings in poor condition
B.excessively worn actuator-piston packing
C.broken directional control valve centering springs
D.low hydraulic oil viscosity
A.a spring
B.an electromagnet
C.the force of gravity
D.refrigerant pressure
A.viscosity will decrease
B.volume will increase
C.volume will decrease
D.pour point will be reduced
最新試題
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
Thermostatic expansion valves can be adjusted for （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
The usual symptoms of cavitation in a centrifugal pump is （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
The rate of heat transfer from a hot region to a cold region is affected most by the （）.