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MB3 > Pumps > Flashcards

Pumps Flashcards

1
Q

What is used to determine the density of a liquid?

A

Hydrometer

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2
Q

The term specific gravity is used to describe which characteristic of liquid?

A

Density relative to water

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3
Q

Convert 200psia to psig

A

185.3 psig

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4
Q

The amount of liquid that is tranferred per min of a rotary pump is defined by?

A

GPM

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5
Q

What controls the direction of flow in a reciprocating pump?

A

Valves

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6
Q

Names two types of positive displacement pumps?

A

Reciprocating and rotary

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7
Q

What must a pump overcome in order to be able to movd the liquid?

A

Pump head

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8
Q

What pump has one internally cut gear and one externally cut hear separated by a crescent?

A

Internal gear pumps

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9
Q

Which pump uses stationary curved passages within the casing?

A

Diffuser

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10
Q

What ard flexible tube pumps used for?

A

Measured flow

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11
Q

What type of flow does an axial flow pump create

A

Straight line flow does not change in direction

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12
Q

What is atmosperic pressure?

A

It is 14.7 psi at sea level

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13
Q

What is the major advantage to centerline mounted pumps?

A

Thermal growth has little effect on them

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14
Q

The head produced by a pump varies directly with?

A

The square of the impeller diameter

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15
Q

Capacity varies directly with?

A

The diameter of the impeller diameter

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16
Q

Brake horsepower varies directly with?

A

The cube of the impeller diameter

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17
Q

What do you use to minimize clearances between impeller and casing? What does this reduce?

A

Wear rings and the reduces suction recirculation

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18
Q

When should wear rings be replaced?

A

They should be replaced when theyre 3 times the initial clearance

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19
Q

What shape are the rotors in an external vane pump?

A

Oval

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20
Q

What must you do before disassembling a lobe pump?

A

Check for mate marks on the timing gears

21
Q

What lind of pump can be activated by the air?

A

Diaphramp

22
Q

What device is moved to vary output in an axial piston pump

A

Swash plate is moved

23
Q

What is the difference between a pumps actual displacement vs its theoretical?

A

Slip and friction are the differences

24
Q

How is thd capacity of a postitive displacement pump regulated?

A

By varying the speed

25
Q

What is volumetric efficiency?

A

The ratio of actual fluid pumped to theoretical value

26
Q

On plunger pumps what is used to control direction of flow?

A

Check valve

27
Q

What would you use to check temperature of pumps or other rotating equipment?

A

Pyrometer

28
Q

What causes aeration?

A

Air being drawn into the suction line (low pressure on the suction side)

29
Q

What protects the shaft of a pump near the gland?

A

Shaft sleeve

30
Q

When a pump operates at a higher temperature then the motor, where should the motor be placed to compensate for this during alignment?

A

Motor should be shimmed higher than the pump

31
Q

Which pump can pump a liquid without contaminating the liquid

A

Diaphram

32
Q

Pump centerline to the level of the discharge tank is called?

A

Discharge head

33
Q

Pump centerline to the level of supply is known as.

A

Static suction head

34
Q

What device is moved to vary the output of a rotary vane pump?

A

The cam rings

35
Q

How can you tell if a vane pump is balanced or not?

A

Balance has the rotor centered in an elliptical housing and offset rotor is unbalanced

36
Q

What would you use to test a pumps efficiency

A

Metering and pressure gauges

37
Q

What type of seal is a mechanical seal?

A

Axial seal

38
Q

Typical packing is considered what type of seal?

A

Internal seal

39
Q

What does the sizing 1.5 x 3 x 6 for a pump mean?

A

Size of discharge, size of suction, soze of impeller

40
Q

What is the difference between a piston pump and a plunger pump

A

A plunger pump has its plunger sliding inside the packing and a piston pump has its packing sliding with its piston

41
Q

What type of lubricator must be used to carry the lubricant long distances?

A

Oil mist systems

42
Q

How is leakage reduced behind the impeller eye?

A

Static and dynamic

Alignment

43
Q

What should you do before laser alignment?

A

Rough alignment

44
Q

Laser beams from the laser are harmful too?

A

Your eyes

45
Q

When a motor runs at high speeds the alignment accuracy becomes?

A

The accuracy becomes more important

46
Q

What is the minimum number of reference points for laser alignment?

A

3 points

47
Q

What is the main referance point fof laser alignments?

A

12 o’clock position

48
Q

With cross dialing bar sag is added to ______ dial and subtracted from _____ dial

A

Added to A dial and subtracted from B

49
Q

What are the 4 major pieces of a laser alignment kit?

A

Transmitter, detector, and the brackets control unit

MB3 (7 decks)

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