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
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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
A.cause of salt contamination
B.location of salt water contamination
C.chemical makeup of feed-water
D.level of alkalinity in condensate
A.refrigerant overcharge
B.overfeeding by the expansion valve
C.a restricted suction strainer
D.due to short cycling of the compressor
最新試題
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
Thermostatic expansion valves can be adjusted for （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
A pressure drop through the refrigerant liquid line may cause （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
A salinity indicator is used to determine the （）.