Module A

Question 1

Which of the following pumps are dynamic:
- Centrifugal
- Axial
- Reciprocating
- Mixed-flow

Answer 1

• Centrifugal
• Axial
• Mixed-flow

Question 2

What is absolute pressure?

Answer 2

Gauge pressure plus atmospheric pressure

Question 3

As pressure is reduced, the boiling point of a liquid ___________

Answer 3

Decreases

Question 4

What happens when a liquid vaporizes in a closed system?

Answer 4

Cavitation can occur

Question 5

A tank 20 ft high is full of brine. The S.G. of brine is 1.03. What would the reading be on a pressure gauge connected to a pipe leading from the bottom of the tank?

Answer 5

8.9 psi

Question 6

When the pump inlet is ____ the level of liquid in the supply reservoir, the pump has a suction head.

Answer 6

below

Question 7

What source of energy is available to allow liquid to enter a pump with suction lift?

Answer 7

Atmospheric Pressure

Question 8

__________ is the component that converts mechanical energy into kinetic energy.

Answer 8

Impeller

Question 9

The NPSHR must be _________ the NPSHA

Answer 9

Less than

Question 10

A pump converts mechanical energy into ___________

Answer 10

Hydraulic Energy

Question 11

Unless otherwise stated, pump performance _____ are based on handling cold water

Answer 11

curves

Question 12

What are the four factors that affect friction loss thorough a pipe?

Answer 12

1. Type of Pipe
2. Length of pipe
3. diameter of pipe
4. type of fluid flowing through the pipe

Question 13

The flow produced by a pump varies ___________ with the impeller diameter

Answer 13

directly

Question 14

If the impeller diameter in a pump is increased in a pump, the _________ will increase at an equal rate

Answer 14

Flow

Question 15

Unless otherwise stated, pump performance curves are based on handling _____________

Answer 15

cold water

Question 16

The __________ produced by a pump varies with the square of the impeller diameter

Answer 16

Head

Question 17

The head produced by a pump varies with ______________

Answer 17

the square of the impeller diameter

Question 18

What is located between the suction and discharge in a regenerative turbine pump?

Answer 18

The stripper

Question 19

Which type of pump is not dynamic?

Answer 19

Reciprocating

Question 20

The stripper in a regenerative turbine pump is located between the:

Answer 20

the suction and discharge

Question 21

Calculate the pressure created by 75 ft height of fresh water.

Answer 21

= 75 ft x 0.433
= 32 psi

Question 22

Calculate the height of fresh water necessary to create 175 psi.

Answer 22

= 175 psi/ 0.433
= 404 ft

Question 23

Calculate the pressure (P) created by oil held at a 80ft height. Oil has an S.G.= 0.8.

Answer 23

P = 80ft x 0.433 x 0.8
P = 27.712
P = 28 psi

Question 24

Calculate the pressure (P) created by seawater held at a 60ft height. Seawater has an S.G.= 1.03

Answer 24

P = 60ft x 0.433 x 1.03
P = 26.7594
P = 27 psi

Question 25

How many feet of head (ft) of fresh water produces a pressure (P) of one psi?

Answer 25

Height = P /0.433 x SG Height = 1/0.433 x 1 Height = 2.309 Height = 2.31 ft

Question 26

A pump has to pump fresh water up a vertical pipe 100 feet high. What is the pressure (p) due to the weight of the fresh water?

Answer 26

P = Height x 0.433 x SG P = 100 ft x 0.433 x 1 P = 43.3 psi

Question 27

A pressure loss of 50 psi is equivalent to how many feet of head (ft) of fresh water?

Answer 27

Height = P /0.433 x SG Height = 50/0.433 x 1 Height = 115.473 Height = 115 ft

Question 28

A river pump supplying a plant with fresh water for cooling is 300 feet lower than the equipment it is cooling. The water pressure (P) at the plant must be 100psi. Calculate the required discharge pressure (P) at the river pump.

Answer 28

P = Height x 0.433 x SG P = 300 ft x 0.433 x 1 P = 129.9 psi Since we need 100 psi at the plant P = 129.9 + 100 P = 229.9 P = 230 psi