Pump Quiz Review 1

Question 1

What is a pump?

Answer 1

Lifts or moves fluid against gravity or exhaust gases

Question 2

What is capacity in relation to pumps?

Answer 2

The amount of material that a pump moves in a given length of time, normally measured in Gallons per Minute (GPM)

Question 3

What factors affect pump capacity?

Answer 3

• RPM
• Viscosity of fluid
• Size of the impeller

Question 4

What are the two systems of pressure in pumps?

Answer 4

• Pounds per Square Inch (PSI)
• Head

Question 5

Define pressure in the context of pumps.

Answer 5

Force acting on a unit of area

Question 6

What is suction head (positive head)?

Answer 6

Pressure at the suction

Question 7

What is discharge head?

Answer 7

Pressure at the discharge

Question 8

What does total head refer to?

Answer 8

Distance that the pump lifts the fluid

Question 9

What is suction lift (negative head)?

Answer 9

Distance the fluid must be lifted to the pump

Question 10

How does a pump work?

Answer 10

The fluid is forced into the pump’s suction by atmospheric pressure when a partial vacuum is built up in the pump

Question 11

What creates the vacuum in reciprocating pumps?

Answer 11

Piston or plunger

Question 12

What creates the vacuum in rotary pumps?

Answer 12

Cam or gear action

Question 13

What creates the vacuum in centrifugal pumps?

Answer 13

The liquid forced out creates the vacuum

Question 14

What are the two categories of pumps?

Answer 14

• Positive-Displacement
• Non-Positive-Displacement

Question 15

What is unique about the volume in non-positive displacement pumps?

Answer 15

Volume doesn’t change during the pumping cycle

Question 16

What is the most common type of pump?

Answer 16

Centrifugal Pump

Question 17

List advantages of centrifugal pumps.

Answer 17

• Low Initial Cost
• Minimum Maintenance Cost
• Operated Quietly
• Capable of handling almost any type of fluid

Question 18

What is the function of a centrifugal pump?

Answer 18

Employs centrifugal force to lift fluids from a lower to a higher level

Question 19

What does a centrifugal pump consist of?

Answer 19

An impeller rotating in a volute casing

Question 20

Describe the flow process in a centrifugal pump.

Answer 20

Liquid is led in the center (eye), picked up by vanes, accelerated to a high velocity, and discharged by centrifugal force into the casing

Question 21

What is the maximum discharge pressure for a single-stage centrifugal pump?

Answer 21

250 PSI

Question 22

What happens to PSI in multi-stage centrifugal pumps?

Answer 22

PSI adds

Question 23

What are the classifications of centrifugal pumps?

Answer 23

• Split case
• End suction

Question 24

What is the characteristic of volute type centrifugal pumps?

Answer 24

Impeller discharges into a progressively expanding spiral casing

Question 25

What does a diffuser type centrifugal pump involve?

Answer 25

Gradually expanding passages formed by stationary guide vanes

Question 26

What distinguishes single-stage from multi-stage pumps?

Answer 26

Single-stage has one impeller, multi-stage has two or more

Question 27

What are the styles of impellers?

Answer 27

* Open * Semi-Open * Enclosed

Question 28

What is the best use for open impellers?

Answer 28

Liquids handling minimal amount of solids and grit

Question 29

What are the functions of wear rings in pump casings and impellers?

Answer 29

Control the leakage of liquid from high-pressure discharge area back into the suction area

Question 30

What is the purpose of seals in pumps?

Answer 30

Control the movement of fluids across a joint or opening

Question 31

What are packings in relation to seals?

Answer 31

A form of a seal commonly associated with relative motion

Question 32

What are the basic components of a stuffing box?

Answer 32

* Packing Chambers or Box * Packing Rings * Gland Follower or Stuffing Gland Lantern ring

Question 33

What is the function of flush water in compression packing?

Answer 33

Flushes contaminants and cools the packing and cools the shaft

Question 34

What is a mechanical seal?

Answer 34

An end-face type seal designed to provide rotary seal faces with practically no visible leakage

Question 35

What are the two basic subassemblies of a mechanical seal?

Answer 35

* Rotating Assembly * Stationary Assembly