5 - 6 Flashcards
The work of pumping consists of discharging a quantity of liquid or gas against a/an?
A) inlet
B) vacuum
C) resistance
D) volute
C) resistance
pg 1
The motion exerted by pumps on the fluids pumped may be due to?
A) reciprocation action
B) centrifugal action
C) jet action
D) all of the above
D) All of the above
pg 1
Fluid density, height fluid must be raised, pipe friction, and static pressure all relate to:
A) total pump head
B) positive suction head
C) static head only
D) dynamic suction lift only
A) Total pump head
pg 32
Check valves are sometimes installed in the suction line of pumps to
A) Prevent over speeding
B) Preventing suction loss or shutdown
C) Control amount of fluid discharge
D) All of the above
B) preventing suction loss or shutdown
pg 1
What type of pump can be operated with the discharge valve closed?
A) reciprocating
B) gear
C) screw
D) centrifugal
D) centrifugal
pg 35
What type of pump operates on the velocity, restriction principle?
A) centrifugal
B) rotary
C) screw
D) ejector
D) ejector
pg 9
What type of pump is best suited for the handling of dirty water?
A) non positive displacement
B) rotary
C) positive displacement
D) ejector
A) non positive displacement
pg 9
The purpose of the volute type of casing or diffusion vanes of centrifugal pumps is to:
A) Increase the kinetic energy of the discharging fluid
B) Increase the velocity of the discharging fluid
C) reduce the velocity and increase the pressure of the discharging fluid
D) Reduce both the velocity and the pressure of the discharging fluid
C) reduce the velocity and increase the pressure of the discharging fluid
pg 16
The laws governing the temperature pressure relations of the liquids explain why a force must be used to cause a liquid to flow into a pump and relate most nearly to:
A) Net positive suction head
B) Pump head
C) Shut off head
D) Specific speed
A) Net positive suction head
pg 36
Inter-stage leakage in multi-stage centrifugal pumps is most usually controlled by the use of?
A) wearing rings
B) mechanical seals
C) packing
D) all of the above
A) Wearing rings
pg 24
The purpose of wearing rings or labyrinth rings in centrifugal pumps is to?
A) control inter-stage losses
B) reduce recirculation losses
C) reduce maintenace costs
D) All of the above
D) all of the above
pg 24
The function of a lantern ring in the stuffing box of a centrifugal pump is to?
A) Distribute sealing or lubricating water around the pump shaft
B) Seperate two different types of packing used in the stuffing box
C) Equilize pressure applied to the packing by the gland nuts
D) Bleed off packing gland leakage from the stuffing box
A) Distribute sealing or lubricating water around the pump shaft
pg 27
In what part of a centrifugal pump is the kinetic energy in the fluid converted to potential or pressure energy?
A) The impeller
B) The casing
C) The labyrinth rings
D) non of the above
B) the Casing
pg 30
The head generated by the centrifugal pump is always expressed in?
A) lbs/sq in
B) cu. ft/sec
C) feet of liquid
D) lbs/sq ft
C) feet of liquid
pg 32
One foot of pump head is a static force exerted by a column of water one foot high on an area of one square inch. It is equal to how many pounds of pressure?
A) 62.4
B) 7.4
C) .434
D) .343
C) .434
pg 37
