Book 2 Chapter 28: Types Of Pumps

Question 1

A prime purpose of having a pump is to:
A) Create a pressure differential only
B) Develop a static suction pressure
C) Raise a fluid from a lower level to a higher lever
D) Transfer a fluid from one place to another

Answer 1

D) Transfer a fluid from one place to another

Question 2

Two classifications of pumps are:
A) Rotary and external gear
B) Reciprocating and plunger
C) Dynamic and positive displacement
D) Volute and diffuser

Answer 2

C) Dynamic and positive displacement

Question 3

A sliding vane pump fits into the category:
A) Dynamic mixed flow
B) Positive displacement rotary
C) Dynamic centrifugal volute
D) Positive displacement lobe

Answer 3

B) Positive displacement rotary

Question 4

The vertical linear distance measured from the centreline of the pump down to the surface of the liquid on the suction side of the pump is termed:
A) Static suction head
B) Total static suction
C) Dynamic suction lift
D) Static suction lift

Answer 4

D) Static suction lift

Question 5

Centrifugal pumps must be placed close to or below the surface of the liquid being pumped because:
A) Of their inability to produce high lift
B) It makes them less apt to lose their prime
C) It makes them easier to prime
D) It decreases the chance of “surging”

Answer 5

A) Of their inability to produce high lift

Question 6

A device used in a centrifugal pump to make the conversation from kinetic energy (velocity) to potential energy (pressure) more effective is the:
A) Impeller
B) Volute
C) Wear ring
D) Diffuser

Answer 6

D) Diffuser

Question 7

Which of the following types of pumps require internal valves (that is, valves which are part of the pump)?
A) Rotary gear
B) Reciprocating
C) Sliding vane
D) Centrifugal
E) Rotary lobe

Answer 7

B) Reciprocating

Question 8

A rotary pump:
1. Is a variety of dynamic unit
2. Does not have discharge pulsations
3. Should be equipped with a relief valve
4. Has the highest capacity of any pump
5. Never requires casing lubrication

A) 1,2
B) 2,3
C) 3,5
D) 1,3
E) 3,4

Answer 8

B) 2,3

Question 9

The vertical distance from the liquid surface up to the pump centre-line plus the vertical distance from the pump to centre-lie up to the surface of the liquid in the discharge tank is:
A) Static head
B) Total static head
C) Suction lift
D) Total discharge head
E) Static discharge head

Answer 9

B) Total static head

Question 10

Rotary pumps:
1. Have tight clearances on all moving parts
2. Are normally used for boiler feed pumps
3. Are positive displacement units
4. Should not be started with discharge closed

A) 2,3
B) 1,3,4
C) 1,2,3
D) 1
E) 1,2

Answer 10

B) 1,3,4

Question 11

Liquid in a centrifugal pump leaves the impeller and enters the:
A) Baffle chamber
B) Suction line
C) Volute casing
D) Vibration housing
E) Pump seal

Answer 11

C) Volute casing

Question 12

Centrifugal pumps do not develop good suction lift because:
A) The speed is too low
B) Their internal component clearances are too high
C) They favour pressure rather than volume
D) The pumped medium relative density is too high
E) Atmospheric pressure is usually too low

Answer 12

B) Their internal component clearances are too high

Question 13

Pumps handling cryogenic materials operate:
A) As high speed units
B) As tandem units
C) As staged units
D) At extremely low temperatures
E) Nearly always as dynamic units

Answer 13

D) At extremely low temperatures

Question 14

The general construction of a centrifugal pump consists of:
A) Gears rotating in a housing
B) A pulsating disc
C) An impeller surrounded by a casing
D) Sliding vanes
E) A piston moving back and forth in a cylinder

Answer 14

C) An impeller surrounded by a casing

Question 15

A volute type of pump:
A) Casing has an increasing cross-sectional area
B) Is a positive displacement pump
C) Is more costly than diffuser pumps
D) Is a regenerative type pump
E) Reduces the velocity in the discharge nozzle

Answer 15

A) Casing has an increasing cross-sectional area

Question 16

The purpose of stationary diffuser vanes in a centrifugal pump is to:
A) Convert velocity to pressure
B) Create smooth transition to the pump discharge
C) Increase the velocity of flow
D) Increase resistance to flow
E) Reverse rotation of the fluid

Answer 16

A) Convert velocity to pressure

Question 17

The distance, measured vertically, that the intake of the pump is placed above the surface of the water is referred to as:
A) Static suction head
B) Total head
C) Static discharge head
D) Total static head
E) Static suction lift

Answer 17

E) Static suction lift

Question 18

The distance from the free surface of the supply tank to the centre line of the pump is referred to as:
A) Total static head
B) Static suction head
C) Total head
D) Static discharge head
E) Static suction lift

Answer 18

B) Static suction head

Question 19

The area of the centrifugal pump where the velocity of the liquid discharged from the impeller is lowered and converted to pressure is an area of increasing cross-sectional area called the:
A) Impeller
B) Wear ring
C) Eye
D) Volute
E) Diffuser

Answer 19

D) Volute

Question 20

The sliding vane pump consists of all of the following except:
A) An eccentric casing
B) A rotor
C) An impeller
D) Sliding vanes

Answer 20

C) An impeller

Question 21

Lobe pumps are similar in theory to _____________ pumps.
A) Volute
B) Dynamic
C) Reciprocating
D) Gear
E) Plunger

Answer 21

D) Gear

Question 22

The vertical distance from the surface of the source of supply to the surface of the water in the discharge tank is referred to as:
A) Total static head
B) Static discharge head
C) Total head
D) Static suction lift
E) Static suction head

Answer 22

A) Total static head

Question 23

A device used in a centrifugal pump to make the conversation from velocity to pressure more effective is the:
A) Wear ring
B) Diffuser
C) Volute
D) Eye
E) Impeller

Answer 23

B) Diffuser

Question 24

Reciprocating pumps are used for _________ applications.
A) Low volume, high-temperature
B) Low volume, high pressure
C) High volume, high pressure
D) Low volume, low pressure
E) High volume, low temperature

Answer 24

B) Low volume, high pressure

Question 25

Centrifugal pumps can be subdivided into all of the following types except:
A) Volute
B) Gear
C) Regenerative
D) Diffuser
E) Axial flow

Answer 25

B) Gear