As the liquid travels through the volute casing of a centrifugal pump toward the discharge, its _______ energy is converted into pressure or potential energy.
rotation
fluids
kinetic
electrical
As compared to a radical flow pump, the axial pump has a low suction lift and develops a relatively ______ discharge head, and has a ______ flow capacity
low, small
low, large
high, small
high, large
The screw pump
has two screws that rotate in the same direction inside the casing
has an externally-cut gear which meshes with an internally-cut gear
has a single rotor containing screw threads within a casing
has two rotors each with three lobes.
has two rotors each with intermeshing screw threads
A/An ______ valve is a combination check valve and minimum flow valve in one unit.
discharge
automatic recirculation valve
remote backpressure valve
minimum flow
Wearing rings are often made of _____ or cast iron since these materials tend to wear in a smooth manner.
bronze
copper
nickel
brass
The mixed flow pump has a single inlet impeller with the flow entering the pump in an axial direction and leaving the pump in direction between axial and _______
centrifugal
radial
series
parallel
The external gear pump
has two gears, which rotate in opposite directions inside the casing.
has an externally-cut gear that meshes with an internally-cut gear, separated by a crescent-shaped portion
has a rotor containing vanes within slots
has two rotors each with three lobes
has two rotors each with two opposing spirals or screw threads
The axial flow pump, often called a _____ pump, uses an impeller with vanes similar to a ships propeller
ships
mates
lift
propeller
Multi-stage centrifugal pumps are equipped with two or more impellers operating in ______
opposition
separate casings
It is imperative that the flow through a multistage pump be kept above a _______ flow rate
maximum
manufactures
minimum
safe
