A.high pressure liquid
B.low pressure vapor
C.high pressure vapor
D.low pressure liquid
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A.propeller hub
B.lignum vitae
C.shaft packing
D.labyrinth seal
A.liquid
B.dry saturated gas
C.wet saturated gas
D.superheated vapor
A.closed, and no leakage permitted across the shaft packing
B.closed, and only slight leakage permitted across the shaft packing
C.open, and no leakage permitted across the shaft packing
D.open, and only slight leakage permitted across the shaft packing
A.freezing point
B.floc point
C.condensing temperature
D.compression temperature
A.the circuit breaker
B.for leaks in the suction piping
C.relief valve is not properly seated
D.the suction strainer
最新試題
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
Thermostatic expansion valves can be adjusted for （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
When the steering gear is in operation, you should （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
Low compressor head pressure in a refrigeration system can be caused by（）.