A.increased pump speed
B.excessive pump discharge pressure
C.too low of a tilting box angle
D.low pump speed
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A.Lube oil passing through the system
B.Moisture or foreign matter collecting at the valve seat and orifice
C.Variable spring tension caused by the changing temperature
D.Frost on the liquid line
A.an immediate crankcase explosion
B.oil contamination in the compressed air
C.a decrease in compressor capacity
D.no immediate loss of the compressed air capacity
A.The density of the air entering the compressor
B.The temperature of the air entering the compressor
C.The designed rotating speed of the compressor
D.A leaking head gasket
A.Differential
B.Trunk
C.Barrel
D.Valve-in-head
A.return to a neutral position
B.flood the evaporator
C.open
D.close
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An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
If the head pressure of a reciprocating refrigeration compressor is excessive, ().
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
When the steering gear is in operation, you should ().
The major source of chemical contaminants in hydraulic fluid is ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
A salinity indicator is used to determine the ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().