Introduction To Pumps

Question 0

Positive displacement pumps cannot handle entrained air

Answer 0

False

Question 1

All positive displacement pumps have pumping chambers

Answer 1

True

Question 2

Double-acting piston pumps discharge an equal amount of liquids on all strokes

Answer 2

False

Question 3

Which one of the following reciprocating pumps can be allowed to run dry

Answer 3

Diaphragm pump

Question 4

Rotary pumps produce a smoother flow than reciprocating pumps

Answer 4

True

Question 5

Which of the following pumps is not dynamic

Answer 5

Reciprocating

Question 6

What is the definition of absolute pressure

Answer 6

Gauge pressure plus atmospheric pressure

Question 7

What is the equivalent head of oil when a pressure gauge reads 100 psi (the oil density is 56lb/ft3

Answer 7

257

Question 8

As pressure is reduced, the boiling point of a liquid decreases?

Answer 8

True

Question 9

What occurs in a pump when a liquid vaporizes in a closed system

Answer 9

Cavitation occurs

Question 10

A tank 20’ high is full of brine,the RD 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 10

8.9 psig

Question 11

What could cause cavitation to occur

Answer 11

An increase in liquid velocity

Question 12

In a closed system, as the velocity energy increases,

The pressure energy decreases?

Answer 12

True

Question 13

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

Answer 13

False

Question 14

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

Answer 14

Atmospheric pressure

Question 15

Which pump component converts mechanical energy to kinetic energy?

Answer 15

Impeller

Question 16

What value must the NPSHa be for proper pump operation

Answer 16

Less than the NPSHa

Question 17

Diffusers :

Answer 17

Are stationary

Question 18

Unless otherwise stated, pump performance curves are based on handling of what type of fluid

Answer 18

Cold water

Question 19

Pump curves are provided by the pump manufacturer

Answer 19

True

Question 20

What does not contribute to friction loss through pipes

Answer 20

Increase in atmospheric pressure

Question 21

What could be a possible cause for an increase in differential pressure across a strainer

Answer 21

The strainer needs to be cleaned

Question 22

When you have a safe work permit to service a pump,what is the first thing you must do before commencing work

Answer 22

Isolate the pump’s prime mover (tagged and locked out )