A.Expansion valve
B.Evaporator
C.Drier
D.Receiver
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A.using a slightly dirty air filter
B.using oil having an excessive viscosity
C.intercooler or after-cooler leaks
D.carrying the oil level higher than normal
A.increased capacity of the compressor
B.more efficient operation of the thermal expansion valve
C.decreased capacity of the compressor
D.loss of receiver capacity
A.damage to the un-loader operating diaphragm
B.an increase in current flow to the motor
C.high pressure in the receiver and filter
D.an excessive consumption of crankcase oil
A.first stage
B.second stage
C.distillate cooler
D.salt water feed heater
A.Gravity siphon effect
B.Higher vacuum in the second-stage
C.Difference in brine density between first and second stages
D.lower pressure in first-stage
最新試題
The usual symptoms of cavitation in a centrifugal pump is （）.
When the steering gear is in operation, you should （）.
The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
Which of the listed pumps is NOT a positive displacement pump?（）
The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its （）.
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 （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
The general purpose of a heat exchanger is to （）.