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
Which of the listed pumps is NOT a positive displacement pump?()
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ().
The major source of chemical contaminants in hydraulic fluid is ().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().
The control mode in which the final control element is moved from one of two flexed positions to the other is known as ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should ().