A.should be paved
B.should be cleaned
C.should be dismantled
D.should be welded
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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
A.compressor
B.condenser
C.throttle valve
D.evaporator
最新试题
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().
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 ().
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump ().
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will ().
Thermostatic expansion valves can be adjusted for ().
The general purpose of a heat exchanger is to ().
A salinity indicator is used to determine the ().
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?()