A.gravity
B.diameter
C.circumference
D.cylinder
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A.displacement
B.weight
C.power
D.capacity
A.should be paved
B.should be cleaned
C.should be dismantled
D.should be welded
A.fulfill
B.eliminate
C.grease
D.bend
A.Condenser and thermal expansion valve
B.King and solenoid valves
C.Compressor and thermal expansion valve
D.Condenser and solenoid valve
A.Too much refrigerant
B.Too little refrigerant
C.Refrigerant is ran out
D.Running is over
A.increase
B.reduce
C.maintain constant
D.None of the above is true
Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? ()
(1) too little cooling water
(2) too much cooling water
(3) too warm cooler water
A.(1)only
B.anyof(1),(2)and(3)
C.anyof(1)and(3)
D.anyof(1)and(2)
Which of the following may cause that the compressor cuts off on high pressure cutout in a refrigeration plant? ()
(1) faulty condensing
(2) too few refrigerant
(3) high discharge pressure
A.any of (1) and (3)
B.any of (1) and (2)
C.any of (2) and (3)
D.any of (1), (2) and (3)
A.cutout
B.controller switch
C.pressure controller
D.cutout switch
A.evaporator
B.compressor
C.condenser
D.none of the above
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The amount of fluid friction or internal friction inherent in a mineral lubricating oil is reflected as a measure of its ().
When the steering gear is in operation, you should ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().
A pressure drop through the refrigerant liquid line may cause ().
The usual symptoms of cavitation in a centrifugal pump is ().
One cause of high head pressure occurring in a refrigeration system can be ().
The general purpose of a heat exchanger is to ().
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()