單項(xiàng)選擇題The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as ().

A.dehydration
B.condensation
C.evaporation
D.dissolution


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2.單項(xiàng)選擇題The sensing line for the low pressure cutout switch to a refrigeration system is located ().

A.in the chill box
B.before the receiver
C.on the suction side of the compressor
D.on the discharge side of the compressor

3.單項(xiàng)選擇題Which of the following statements is true concerning any evaporator?()

A.High conductivity of the distillate indicates distillate salinity is excessive
B.Increasing the absolute pressure of the shell will increase the distillers capacity
C.Mesh separators are used in evaporators to filter the distillate
D.Reducing the brine density will reduce the heat lost overboard

4.單項(xiàng)選擇題A knocking sound emitted from an unloaded air compressor is probably caused by ().

A.damaged intake valves
B.excessively tight mounting bolts
C.insufficient cylinder lubrication
D.a loose piston

5.單項(xiàng)選擇題The refrigeration system low pressure cutout switch is actuated by ().

A.an electric system manager
B.a sensing bulb at the tail coil of the evaporator
C.pressure changes in the suction line
D.failure of the king solenoid valve

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Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()

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A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().

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Which of the listed pumps is NOT a positive displacement pump?()

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An excessive charge of refrigerant in an air-cooled refrigeration system can cause ().

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An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().

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Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()

題型:單項(xiàng)選擇題