A.CO2
B.Methyl chloride
C.R-22
D.Sulphur dioxide
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A.Suction head
B.Pump head
C.Discharge head
D.Total head
A.toxic
B.flammable
C.explosive
D.all of the above
A.Fire pump and lube oil pump
B.Lube oil pump and distilling plant
C.Distilling plant and shaft alley door
D.Shaft alley door and fixed CO2 release
A.bypass the high pressure stage to the low pressure stage on 100% of the air compressors in service
B.prevent excessive inter-stage pressure buildup
C.control compressor discharge pressure
D.remove all but the frictional load during starting
A.The relief valves in the system should be readjusted
B.The filters and strainers should be checked frequently
C.All system pressure should be readjusted
D.The system should be drained and renewed with a fluid of different operating characteristics
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 （）.
The major source of chemical contaminants in hydraulic fluid is （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
Thermostatic expansion valves can be adjusted for （）.
The general purpose of a heat exchanger is to （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
When the steering gear is in operation, you should （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Which of the following statements is correct concerning heat transfer?（）