单项选择题
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
To operate a centrifugal fire pump at reduced capacity,...
单项选择题To operate a centrifugal fire pump at reduced capacity, you should （）.
A.readjust the relief valve B.throttle the suction line C.throttle the discharge valve D.open the priming line
