A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed
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A.Dissipate heat
B.Trap foreign matter
C.Separate air from the oil
D.All of the above
A.Dissipate heat
B.Trap foreign matter
C.Separate air from the oil
D.All of the above
A.Proper refrigerant charge
B.Faulty expansion valve
C.Insufficient refrigerant
D.Solenoid valve stuck open
A.freezing the expansion valve closed
B.corrosion of system piping
C.improper temperature regulation
D.all of the above
A.built up propeller
B.solid propeller
C.controllable pitch propeller
D.suction back propeller
最新試題
The output volume of a positive fixed displacement pump can be changed only by （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
When the steering gear is in operation, you should （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
A pressure drop through the refrigerant liquid line may cause （）.
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.
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 （）.
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.