Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Millwright 2 > Pumps > Flashcards

Pumps Flashcards

1
Q

Non positive pump names

A

Dynamic,centrifugal,kinetic or continuous flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Non positive delivery

A

High liquid, low pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define specific gravity

A

Specific gravity is the ratio of density of a substance to that of water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is water sg

A

Cold water has an SG of 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What happens to specific gravity of a substance as temperature increases?

A

If the temperature goes up, the SG goes down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Capacity of a pump

A

Capacity is the pumps volume output in gallons per minute. Or 1/min

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Displacement

A

Displacement is the pumps volume output per revolution/stroke

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Under perfect conditions, how much water can a pump lift at sea level

A

34 feet or 10.37 m.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

As a raise in altitude above, sea level, the atmospheric pressure goes?

A

Down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

At sea level what is the atmospheric pressure of weight on an area of one square inch

A

14.7 psia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is cavitation?

A

If the temp goes up on a liquid or a pressure is reduced, small pockets of gas begin to form example is vapor, they move them to higher pressure areas such as the loot discharge, and the bubbles implode and collapse, making it sound like there are rocks in the pump turning back into a liquid breaking down components

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How can you check if the pump is cavitating?

A

Throttle the discharge, see if it gets quieter if it does, your pump was cavitating.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is suction head?

A

This is where the level of supply liquid is above the pump in the centre line.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Static suction head

A

Vertical distance from the centre line of the suction I have the pump to the surface of supply

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Discharge head

A

This is the vertical distance from the centre line of the suction eye to the surface of the liquid in the tank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Total static head

A

Vertical distance from the liquid level to the liquid discharge level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Suction lift

A

Supply tank is below the pump inlet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Static suction lift

A

Vertical distance from the centreline of the suction eye of the pump to the surface of supply 

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

NPSHA should be 10% greater than NSPHR

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

If a pipe diameter is halved in a flow system, the velocity of the fluid in the system should have to be ?

A

Four times the original flow amount to maintain the same output flow due to the friction losses

21
Q

As he raise an altitude, they will be more or less atmospheric pressure exerted on the fluid in the tank to help push the fluid into the pumps in light

A

Less

22
Q

How to calculate psi

A

Feet Times .433

23
Q

How to calculate feet

A

Psi divided by .433.

24
Q

Capacity varies directly with the diameter

A
25
Q

Head varies with the square of the diameter

A
26
Q

Brake horsepower varies with the cube of the diameter

A
27
Q

When are dynamic pumps used

A
28
Q

The flow produced by a pump varies

A

Directly with the impeller diameter

29
Q

Pumps convert mechanical energy into

A

Hydraulic energy

30
Q

The component that converts mechanical energy into kinetic energy is

A

Impeller

31
Q

Vacuum pressure

A

Vacuum pressure expresses pressure below atmospheric pressure. It is frequently measured in inches of mercury.

32
Q

Mercury

A

Hg

33
Q

Centrifugal, axial, reciprocating or mixed flow. Which one is not dynamic

A

Reciprocating

34
Q

Head pressure is

A

Is the height in feet of a column of water that is one foot square at the base.

35
Q

Aeration

A

Where a partial vacuum is created at the pump inlet, suction,flange leaks can draw air into pump. It reduces the amount of liquid that can pass through the pump.

36
Q

Turbulent flow

A

Turbulent flow occurs when the particles of liquid no longer move parallel with the axis of the pipe.

37
Q

Turbulent flow is caused by

A

Bends, abrupt changes in cross sections, fittings in the pipe, velocity that is too high

38
Q

What happens if velocity decreases

A

Pressure increases

39
Q

Total energy in a closed system is the total head and is made of two components

A

Head pressure= from the pressure acting upon the liquid.

Velocity head = from the speed of the liquid

40
Q

Total static head = long
Static discharge head and static suction lift are combined to equal total static head

A

Static discharge head is on the top

Static suction lift is on the bottom braking at the impeller eye

41
Q

The measure of intensity of effort described as force per unit of area

A

Pressure

42
Q

This term is used when the level of supply liquid is above the centreline of the pump

A

Suction head

43
Q

The condition where the supply reservoir is located below the pump

A

Suction lift

44
Q

Another name for regenerative turbine pumps

A

PERIPHERAL

45
Q

This type of flow occurs when the particles of the liquid no longer move parallel to the pipe axis

A

Turbulent

46
Q

The pressure at which a liquid flashes into a vapour

A

Boiling point

47
Q

Pressure that is below atmospheric

A

Vacuum

48
Q

Another name for an axial flow pump

A

Propeller

49
Q

What type of flow are open impellers for?

A

Radial flow

Millwright 2 (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions