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.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
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
最新試題
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
Which of the following statements is correct concerning heat transfer?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
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A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.