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
