单项选择题

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

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单项选择题

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

单项选择题

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

单项选择题

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