A.cool the expansion valve
B.prevent refrigerant superheating
C.condense the refrigerant gas
D.prevent motor overheating
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A.Closing of the solenoid valve
B.Closing of the expansion valve
C.An increase in the suction pressure
D.Decreasing the suction pressure
A.When the helm is at any angle other than amidships
B.When the six-way valve is opened
C.When the ram relief valves lift
D.When the redder angle is different from the position of the helm
A.suppressant additive
B.dispersant additive
C.extreme pressure additive
D.viscosity improver additive
A.centrifugal pumps
B.jet pumps
C.propeller pumps
D.reciprocating pumps
A.a compressed packing gland
B.lantern tings between the packing rings
C.a liquid seal
D.the stuffing box gland
最新試題
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
A pressure drop through the refrigerant liquid line may cause （）.
Which of the listed pumps is NOT a positive displacement pump?（）
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 （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
Which of the following statements is correct concerning heat transfer?（）
A salinity indicator is used to determine the （）.
The usual symptoms of cavitation in a centrifugal pump is （）.