A.nonexistent
B.for controlling pressure
C.for controlling superheat
D.for controlling the solenoid valve
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A.compressor
B.condenser
C.throttle valve
D.evaporator
A.open-type
B.hermetic
C.semi-hermetic
D.all the above
Which of the following will be desirable properties of refrigerant?（）
(1) non-explosive
(2) non-corrosive
(3) that it doesn’t react with lubricants
A.(1), (2) and (3)
B.(1) and (2)
C.(1) and (3)
D.(2) and (3)
A.saturated
B.super-cooled
C.wet
D.superheated
A.extracts
B.releases
C.gives no
D.absorbs no
最新試題
Which of the listed pumps is NOT a positive displacement pump?（）
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
Which of the following statements is correct concerning heat transfer?（）
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
A grease gun is generally used to lubricate a （）.