A.restriction in refrigerant piping
B.air and non-condensable gases in the condenser
C.water in the refrigerant
D.flooding back of liquid refrigerant from the evaporator
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A.A shortage of liquid refrigerant
B.Excessive frost on the evaporator
C.Excessive condenser cooling water
D.Insufficient condenser cooling water flow
A.eliminate hot air from the condenser
B.maintain steady pressure in a system
C.heat, or cool one fluid by means of another fluid
D.reduce the engine room temperature in tropical climates
A.Cross
B.Parallel
C.Counter
D.Circular
A.remain constant along the tubes length
B.be greatest in a single pass counter flow heat exchanger
C.remain constant throughout the heat exchanger
D.vary from section to section through out the heat exchanger
A.a low load on the unit
B.a clogged pump suction strainer
C.a blockage in the line between the pump and hydraulic motor
D.the hydraulic motor turning too fast
最新試題
Thermostatic expansion valves can be adjusted for ().
One cause of high head pressure occurring in a refrigeration system can be ().
If the suction pressure at the refrigeration compressor is below normal, the cause can be().
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 problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()
A salinity indicator is used to determine the ().
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of ().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
Which of the listed pumps is NOT a positive displacement pump?()
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().