A.run continuously
B.not start
C.have high discharge pressure
D.short cycle on the high pressure switch
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A.Electrical energy
B.Thermal energy
C.Potential energy
D.Kinetic energy
A.sliding block
B.pintle
C.reaction ring
D.tilting box or swash plate
A.overfeeding of the expansion valve
B.damage to the condenser
C.constant running of the compressor
D.flooding of the receiver
A.horsepower
B.work
C.heat
D.velocity
A.compressor lubrication will be improved
B.oil will not leave the crankcase
C.compressor valves will be damaged
D.oil may congeal in the evaporator
最新試題
A pressure drop through the refrigerant liquid line may cause （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Thermostatic expansion valves can be adjusted for （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
The major source of chemical contaminants in hydraulic fluid is （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.