单项选择题

The refrigerant gas returning to the compressor should be （）.

A.superheated
B.saturated
C.dense
D.flooded

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单项选择题

The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by （）.

A.a separate air ejector unit
B.a direct unimpeded connection between second stage and salt water feed heater
C.either by vacuum drag or an external line from the first stage via a fixed orifice
D.the fixed orifice provided in the steam supply line

单项选择题

In which of the listed refrigeration system components does superheating of the refrigerant take place?（）

A.Expansion valve
B.Evaporator
C.Drier
D.Receiver

单项选择题

Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.

A.using a slightly dirty air filter
B.using oil having an excessive viscosity
C.intercooler or after-cooler leaks
D.carrying the oil level higher than normal