A.system was overcharged with refrigerant
B.high pressure switch was improperly adjusted
C.expansion valve strainers were fouled
D.suction valves were leaking slightly
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A.increased pump speed
B.excessive pump discharge pressure
C.too low of a tilting box angle
D.low pump speed
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
最新試題
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can 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 （）.
Which of the following statements is correct concerning heat transfer?（）
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
A salinity indicator is used to determine the （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.