A.suction pressure only
B.head pressure only
C.superheat only
D.suction pressure and box temperature
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A.specific gravity
B.viscosity
C.S E number
D.hydrolytic stability
A.microscopic steel shavings
B.abrasive waste
C.anti-oxidant compounds
D.oxidation by-products
A.increase the capacity of the coil
B.increase the superheat at the bulb
C.deliver more refrigerant to the coil
D.decrease the capacity of the coil
A.Centrifugal
B.Reciprocating
C.Gear
D.Rotary
A.a high suction head
B.rotating rings
C.badly worn bearings
D.a loose stuffing box gland
最新試題
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（）.
A pressure drop through the refrigerant liquid line may cause （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
A salinity indicator is used to determine the （）.
Which of the following statements is correct concerning heat transfer?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
A grease gun is generally used to lubricate a （）.
Which of the listed pumps is NOT a positive displacement pump?（）
A salinity indicator is used to determine the （）.