A.Dissipate heat
B.Trap foreign matter
C.Separate air from the oil
D.All of the above
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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
A.ignition temperature
B.flash point
C.flammable range
D.convection index
A.freeze on the expansion valve seat and reduce the flow of liquid refrigerant
B.emulsify the oil in the condenser
C.freeze in the king valve
D.clog the oil trap
最新試題
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?（）
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
Which of the listed pumps is NOT a positive displacement pump?（）
Which of the following statements is correct concerning heat transfer?（）
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 from a hot region to a cold region is affected most by the （）.
The output volume of a positive fixed displacement pump can be changed only by （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.