A.total heat
B.residual heat
C.specific heat
D.superheat
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A.Single stage or multistage
B.High pressure or low pressure
C.Open or close coupled
D.Horizontal or vertical
A.contaminated fluid
B.pitted thrust rings
C.worn pintle bearings
D.obstructed suctions passage
A.shaft and impeller
B.motor and pump shaft
C.casing and impeller wearing rings
D.lantern ring and impeller
A.central valve
B.radial plunger
C.floating ring
D.cylinder body
A.moisturizing
B.dehumidification
C.dampening
D.humidification
最新試題
One cause of high head pressure occurring in a refrigeration system can be （）.
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
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 head pressure of a reciprocating refrigeration compressor is excessive, （）.
Thermostatic expansion valves can be adjusted for （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.