单项选择题
A.sub-cooled liquid B.high temperature liquid C.oil saturated liquid D.superheated vapor
When operating with a negative suction head, which of t...
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
The discharge rate or capacity of a centrifugal pump wi...
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
Which of the following best describes the thermodynamic...
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
