A.set for maximum torque
B.on the purge and vent stroke
C.in the neutral position
D.rotating backwards
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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
A.a shortage of refrigerant
B.the compressor running continuously
C.liquid refrigerant returning to the compressor
D.the compressor short cycling on the high pressure cutout
最新試題
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A grease gun is generally used to lubricate a （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
The general purpose of a heat exchanger is to （）.
Low compressor head pressure in a refrigeration system can be caused by（）.