单项选择题

The refrigerant leaves the evaporator of a refrigeration system as a low pressure （）.

A.sub-cooled liquid
B.high temperature liquid
C.oil saturated liquid
D.superheated vapor

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单项选择题

When operating with a negative suction head, which of the following types of pumps will require priming?（）

A.Reciprocating
B.Centrifugal
C.Rotary
D.Gear

单项选择题

The discharge rate or capacity of a centrifugal pump will vary directly as the （）.

A.change in the impeller diameter
B.square of the impeller radius
C.cube of the impeller diameter
D.impeller efficiency for large changes in its size

单项选择题

Which of the following best describes the thermodynamic effect on the pressure and volume relationship with regards to saturated gases?（）

A.As pressure decreases, volume increases
B.As volume increases, pressure increases
C.As volume decreases, pressure decreases
D.As pressure increases, volume increases