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

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

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

单项选择题An AC synchronous transmission type remote steering control system consists of a （）.

A.transmitter at the steering station and a receiver at the steering engine
B.reversible motor at the steering station geared to the steering pumps
C.small induction motor on the bridge which controls the redder through pulleys
D.variable displacement hydraulic pump driven by a reversible DC motor

单项选择题In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?（）

A.Distiller air ejector cooling medium
B.Saltwater heater discharge
C.First-stage internal feed box
D.Second-stage internal feed box

单项选择题The component of a refrigerating system in which the refrigerant vaporizes and absorbs heat is known as the （）.

A.condenser
B.vapor generator
C.accumulator
D.evaporator