A.the pump over-speeding
B.an improper rudder response
C.bubbles in the sight glass
D.ram relief valves lifting
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A.smoother pump operation
B.overheating of the bearing
C.reduced corrosion in the bearing
D.increased pump capacity
A.kinetic energy
B.potential energy
C.mechanical energy
D.thermal energy
A.vaporizes in the condenser
B.reaches the compressor through the suction line
C.flashes in the liquid line
D.condenses in the receiver
A.heat
B.power
C.horsepower
D.foot-pound
A.worn bearings and piston pins
B.slugging due to flooding back
C.too much oil in circulation
D.All of the above
最新試題
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
The usual symptoms of cavitation in a centrifugal pump is （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
A salinity indicator is used to determine the （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
One cause of high head pressure occurring in a refrigeration system can be （）.