auxies 2 first quiz

Static positive displacement head of a pump is the

distance of the suction liquid level above the centerl line of the pump

The function of a centrifugal pump double volute casing is to:

Reduce radial thrust on the impeller

Which units of measurement are commonly used to express pump suction head values when calculating pump capacity and hydraulic horsepower?

Feet (ft) or meters (m) of liquid column head (or PSI / Inches of Mercury depending on specific context, but standard hydraulic equations use Feet of Head).

The pressure of a liquid leaving the pump can be reffered to as

discharge head

which of the following terms is used to identify the pressure of a liquid entering a centrifugal pump

suction head

a centrifugal pump may fail to deliver water when first started if the

pump is not primed

Theoretically a double suction impeller is in hydraulic axial balance. In actuality, this balance is achieved due to

unequal or non uniform flow to the suction eyes of the impeller housing

A pump is defined as a device that:

Imparts energy to a fluid to move it from point “A” to point “B”

The diffusion ring installed in many high pressure centrifugal pumps such as feed pumps:

elimanates radial thrust to the impeller

A multi stage centrifugal pump can best be described as having:

Two or more impellers housed together in one casing and mounted on a single shaft

The static suction head of a horizontal centrifugal pump is the difference in elevation between the:

suction liquid level and the pump centerline

A centrifugal pump operating against a closed discharge valve has a:

efficiency of 0%

The impeller illustrated is an example of what:

centrifugal impeller

A centrifugal pump produces flow with a resulted discharge head by energy conversion component typical to follow the order of:

mechanical energy to kinetic energy to potential energy

.As a liquid is being transferred by a centrifugal pump, as the liquid passes through the volute its velocity decreases and:

Its pressure increases.