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Secunduh > Pumps > Flashcards

Pumps Flashcards

1
Q

An archmedian screw pumps water by rotating a [BLANK] in a [BLANK]

A

Thread; trough

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2
Q

If a substance needs to remain within a limited range of temperatures as it flows to the point of use, the distribution system may require (a)

A

Insulated pipes

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3
Q

A centrifugal pump is suitable for pumping waste, because of the [BLANK] head requirement and because the pump can move [BLANK]

A

Low; small particles

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4
Q

Pumps for high viscosity materials generally need to be [BLANK] pumps

A

Positive-displacement

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5
Q

Which kind of pump is generally used for moving grease, mastic, concrete, and other nearly solid materials?

A

Piston

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6
Q

The eye of a pump impeller is above the level of the supply liquid in the [BLANK] condition

A

Suction lift

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7
Q

Total dynamic head (TDH) is the sum of the [BLANK], the [BLANK], and the [BLANK]

A

Static head; head loss; velocity head

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8
Q

The horsepower input to a pump is called [BLANK] horsepower

A

Brake

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9
Q

In order to use the performance curve for a centrifugal pump, you must know the pump’s [BLANK] and its [BLANK]

A

Speed; Impeller diameter

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10
Q

Which pump curve will tell you at what total head the best energy transfer takes place?

A

Efficiency

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11
Q

End-suction centrifugal pumps make up about [BLANK] % of the pumps used in industrial plants

A

80

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12
Q

In a multistage centrifugal pump, each stage increases the [BLANK] of the fluid

A

Velocity

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13
Q

The open impeller is used mainly for pumping fluids containing [BLANK] solids

A

Large

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14
Q

I’m a centrifugal pump, wearing rings prevent damage to the [BLANK] and [BLANK]

A

Impeller; casing

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15
Q

The purpose of shaft sleeves is to prevent the [BLANK] from causing wear on the [BLANK]

A

Packing; shaft

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16
Q

In a lineshaft turbine, the [BLANK] surrounds the [BLANK]

A

Bowl; Impeller

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17
Q

Diffuser vanes in an axial-flow propeller pump

A

Straighten the fluid flow

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18
Q

The main difference between the axial-flow propeller pump and a mixed-flow propeller pump is the shape of the

A

Impeller

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19
Q

What causes electrochemical corrosion in a pump?

A

Combining incompatible materials

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20
Q

Regenerative turbine pumps can be used only to pump fluids with

A

Low viscosity

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21
Q

In an external-gear pump, the fluid is carried between the teeth of [BLANK] and the [BLANK]

A

Both gears; pump housing

22
Q

In an internal gear pump, fluid is carried between the teeth of [BLANK] and the [BLANK]

A

Both gears; crescent

23
Q

Lobe pumps are similar to [BLANK] pumps in their construction and operation

A

External-gear

24
Q

In a screw pump, fluid moves because of the

A

Progressing cavities between threads

25
Q

The diameter of the impeller of a vane pump is [BLANK] the diameter of the housing. The centerline of the impeller is [BLANK] the centerline of the housing.

A

Smaller than; offset from

26
Q

The piston that pumps the fluid in a direct-acting reciprocating pump is commonly driven by

A

Air

27
Q

Single-acting reciprocating pumps discharge fluid on the [BLANK] stroke

A

Forward (only)

28
Q

The piston that pumps the fluid in a power reciprocating pump is commonly driven by an

A

Electric motor

29
Q

Compared to a piston, the plunger of a power pump is typically [BLANK] and has a [BLANK] stroke

A

Longer; longer

30
Q

An air-driven reciprocating pump can deliver fluid at a pressure higher than the supplied air pressure if the fluid piston is [BLANK] the air piston

A

Smaller in diameter than

31
Q

Most metering pumps are [BLANK] pumps

A

Reciprocating

32
Q

Most metering pumps are lubricated by the

A

Fluids they pump

33
Q

The force that moves the diaphragm in most diaphragm pumps is provided by the

A

Hydraulic fluid

34
Q

What actuates the valves of diaphragm pumps?

A

Fluids being pumped

35
Q

Rotary pumps used for metering are usually [BLANK] pumps

A

Vane

36
Q

In a flexible-tube pump, the [BLANK] forces fluid out of the discharge port

A

Roller

37
Q

The problem of leakage in a pump used for moving liquid chemicals is eliminated by the [BLANK] pump

A

Magnetic-drive

38
Q

A dry type sump pump retains its prime because the

A

Suction intake is above the impeller

39
Q

The [BLANK] and the [BLANK] of a reciprocating slurry pump require the most maintenance

A

Cylinder sleeves; valve seats

40
Q

The advantage of a vortex pump is that the

A

Fluid makes little contact with the impeller

41
Q

A little leakage through the packing on a pump is usually [BLANK] because it [BLANK]

A

Desirable; lubricates the shaft

42
Q

Pumps designed for use under suction lift conditions require an

A

Injection-type stuffing box

43
Q

Pumps that operate at temperatures over 450° are usually packed with

A

Aluminum

44
Q

When preparing to install new packing in a pump, your first step should be to

A

Shut off and lock out the power

45
Q

What forms the seal in a packingless seal?

A

Boiler condensate

46
Q

Overfilling the oil reservoirs on a pump can result in

A

Overheated bearings

47
Q

Greases used for lubricating bearings of pumps should be free of

A

Mineral fillers

48
Q

If a pump’s bearing seals need frequent replacement, the problem may be caused by a

A

Rough shaft

49
Q

The major maintenance problems in rotary pumps are usually confined to the

A

Bearings and seals

50
Q

If a reciprocating pump loses its ability to provide enough pressure, the problems may be [BLANK] but you should check the [BLANK] before replacing them

A

Worn piston rings; internal check valves

Secunduh (8 decks)

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