Chapter 73- Types Of Pumps

Question 1

Pumps handling cryogenic materials operate at

Answer 1

Extremely low tempuratures

Question 2

A pump capable of producing water pressure above the boiler pressure in order to add water in the boiler is the__________ pump.

Answer 2

Feedwater pump

Question 3

A pump which supplies oil to the burner is the _______ pump

Answer 3

Fuel oil pump

Question 4

Friction Head

Answer 4

When the pump puts the water in motion, this water will meet resistance in the pipes, valves and fittings. To over come this resistance a certain amount of pressure, called the friction head and expressed in meters of water, is required.

Question 5

Velocity Head or equivalent head.

Answer 5

Velocity head is the force required to move the water at a specific velocity

Question 6

Pressure head

Answer 6

When the pump discharges the water into a vessel under pressure, such as a boiler, it must impart additional pressure, called the pressure head, to the water to overcome the pressure

Question 7

Dynamic head

Answer 7

Friction+ velocity+ pressure head = dynamic head

Question 8

Total head

Answer 8

The total head required to move the water from the source of supply to the point of discharge is the sum of the static and dynamic head

The power required to drive a pump is determined by the amount of liquid pumped and the total head against which the pump operates.

Question 9

Static discharge head

Answer 9

The vertical distance, in feet, from the center line of the pump to the free surface of the water in the discharge tank is called the discharge head.

Question 10

Total static head

Answer 10

The vertical distance from the surface of the source of the supply to the surface of the water in the discharge tank.

The total height a pumps lifts the water

Question 11

Static suction head

Answer 11

The distance from the free surface of the supply tank to the Center line of the pump

Question 12

A pump which supplies water to the cooling tower is the _________ pump.

Answer 12

Circulating water

Question 13

A pump is capable of suction lift due to:

Answer 13

Atmospheric pressure

Question 14

A pump that supplies water to the cooling tower is called

Answer 14

The circulating water pump

Question 15

The total static head of the pump is the

Answer 15

The difference between the static suction head and the static discharge head

Question 16

Centrifugal pumps do not develop good suction lift because

Answer 16

There internal component clearances are to high

Question 17

The vertical distance from the liquid surface up to the pumps Center-line plus the vertical distance from the pump Center-line up to the surface of the liquid in the discharge tank.

Answer 17

total static head

Question 18

The difference between static suction head and static discharge head

Answer 18

Total Static head

Question 19

Preferably, dynamic pumps should be located

Answer 19

Below the liquid source when suction head is involved

Question 20

A hot water heating system circulator should be

Answer 20

Very quiet in operation

Question 21

The capacity of a centrifugal pump

Answer 21

Varies with discharge pressure

Question 22

Centrifugal pumps power requirements are decreased when

Answer 22

The litres moved per minute is decreased

Question 23

A rotary pump should be equipped with a

Answer 23

Relief valve

Question 24

A rotary pump is

Answer 24

A high pressure positive displacement pump

Question 25

A diffuser pump is

Answer 25

Has a high efficiency (more then volute) and a high suction

Question 26

Cavitation refers to

Answer 26

The pump is being filled with vapor

Question 27

A circulating pump is usually connected to

Answer 27

Some type if heat exchanger

Question 28

A multi stage boiler would be use for

Answer 28

When the head is great

Betcha it is ;)

Question 29

Turbine pumps are used for

Answer 29

Low capacity high pressure services

Question 30

Reciprocating pump is defined by

Answer 30

In reciprocating pumps the pumping action is produced by the back and forth motion of the piston or plunger within a cylinder

Question 31

Centrifugal pumps are defined as

Answer 31

A centrifugal pump uses centrifugal force to develop velocity in the liquid being handled. The velocity is then converted to pressure when the liquid velocity decreases.

Question 32

Is a centrifugal pump considered a positive displacement pump

Answer 32

No

Question 33

When the head increases in a centrifugal pump what happens

Answer 33

The capacity drops, if the head increases too much then the capacity drops to zero

Question 34

In a centrifugal pump the suction valve

Answer 34

Must always be open

Question 35

If the discharge valve on a centrifugal pump is closed

Answer 35

The pump may over heat

Question 36

Define cavitation

Answer 36

When pressure drops the liquid may become a vapour, when this vapour goes to a higher pressure area these bubbles collapse cause a shock wave potentially damaging equipment

Question 37

A pump is…..

Answer 37

A mechanism used to move liquids by adding energy to the liquid being moved.

Question 38

Boiler feed water pumps must be capable to?

Answer 38

Force the water over the pressure existing in the boiler.

Question 39

What is used to support large pumps?

Answer 39

Reinforced concrete foundations. For stability and vibration control.

Question 40

Small pumps may be operated by which ones?

a) hand/foot
b) air pressure
c) another fluid pressure
d) electromagnet

Answer 40

A,B,C,D (All of the above)

Question 41

Pumps are classified into three groups?

Answer 41

Reciprocating, Rotary, Centrifugal

Question 42

What is double-acting mean?

Answer 42

When both sides of the piston are take part in the pumping action; liquid is discharged when the piston moves in either direction.

Question 43

A centrifugal pump uses what kind of force?

Answer 43

Centrifugal force