A.displacement
B.weight
C.power
D.capacity
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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
A.nonexistent
B.for controlling pressure
C.for controlling superheat
D.for controlling the solenoid valve
最新试题
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
A salinity indicator is used to determine the ().
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by ().
Thermostatic expansion valves can be adjusted for ().
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump ().
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should ().
The general purpose of a heat exchanger is to ().
Which of the listed pumps is NOT a positive displacement pump?()
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().