A.Thermal expansion valve frozen open
B.Suction gas heat exchanger bypassed
C.Condenser clogged or fouled
D.High pressure cutout switch inoperative
您可能感兴趣的试卷
你可能感兴趣的试题
A.noise and vibration
B.an increase in discharge pressure
C.an increase in suction pressure
D.lifting of the relief valve
A.insufficient cooling water flow to the condenser
B.a low refrigerant charge in the system
C.the liquid valve is open too much
D.high evaporator superheat
A.dead band action
B.neutral zone action
C.range
D.on-off action
A.cavitation
B.electrolysis
C.abrasion
D.corrosion
A.the relief valve should open before the high pressure cutout
B.the relief valve should open and allow the excess refrigerant to flow to the receiver
C.the high pressure cutout switch should operate before the relief valve opens
D.you should close in on the suction valve
A.cause of salt contamination
B.location of salt water contamination
C.chemical makeup of feed-water
D.level of alkalinity in condensate
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
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
最新试题
The rate of heat transfer from a hot region to a cold region is affected most by the ().
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
Low compressor head pressure in a refrigeration system can be caused by().
The usual symptoms of cavitation in a centrifugal pump is ().
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?()
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be ().
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().
The output volume of a positive fixed displacement pump can be changed only by ().