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Flashcards in Introduction To Pumps Deck (23)
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0

All positive displacement pumps have pumping chambers

True

1

Positive displacement pumps cannot handle entrained air

False

2

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

False

3

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

Diaphragm pump

4

Rotary pumps produce a smoother flow than reciprocating pumps

True

5

Which of the following pumps is not dynamic

Reciprocating

6

What is the definition of absolute pressure

Gauge pressure plus atmospheric pressure

7

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

257

8

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

True

9

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

Cavitation occurs

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

8.9 psig

11

What could cause cavitation to occur

An increase in liquid velocity

12

In a closed system, as the velocity energy increases,
The pressure energy decreases?

True

13

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

False

14

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

Atmospheric pressure

15

Which pump component converts mechanical energy to kinetic energy?

Impeller

16

What value must the NPSHa be for proper pump operation

Less than the NPSHa

17

Diffusers :

Are stationary

18

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

Cold water

19

Pump curves are provided by the pump manufacturer

True

20

What does not contribute to friction loss through pipes

Increase in atmospheric pressure

21

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

The strainer needs to be cleaned

22

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

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