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PPE > Lecture 9: Pumps (All Parts) > Flashcards

Lecture 9: Pumps (All Parts) Flashcards

1
Q

What is a positive displacement pump?

A

A positive displacement pump traps a fixed amount of fluid and forces it into a discharge pipe.

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2
Q

What are the two main categories of pumps?

A

Dynamic pumps and positive displacement pumps.

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3
Q

What is the difference between a centrifugal pump and a positive displacement pump?

A

Centrifugal pumps use kinetic energy, while positive displacement pumps use mechanical energy.

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4
Q

What are some common types of positive displacement pumps?

A

Reciprocating pumps, rotary pumps, and diaphragm pumps.

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5
Q

What is the difference between a reciprocating pump and a rotary pump?

A

Reciprocating pumps use a piston or plunger, while rotary pumps use a rotating mechanism.

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6
Q

What is the difference between a gear pump and a vane pump?

A

Gear pumps use interlocking gears, while vane pumps use sliding vanes.

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7
Q

What is the difference between a positive displacement pump and a positive displacement compressor?

A

Pumps move fluid, compressors move gas.

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8
Q

What is pump performance and how is it measured?

A

Pump performance is the ability to move fluid at a certain rate and pressure, measured by flow rate, head, power, and efficiency.

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9
Q

What is the difference between head and pressure in a pump system?

A

Head is the height a pump can lift fluid; pressure is the force a pump can exert on fluid.

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10
Q

What is the difference between a single-stage pump and a multi-stage pump?

A

Single-stage has one impeller, multi-stage has multiple, for higher head.

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11
Q

What is cavitation and how does it affect pump performance?

A

Cavitation is vapor bubble formation due to low pressure, which can damage pumps and reduce performance.

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12
Q

What is the difference between NPSHr and NPSHa in a pump system?

A

NPSHr is the minimum suction head to avoid cavitation, NPSHa is available head in the system.

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13
Q

What is the difference between a fixed displacement pump and a variable displacement pump?

A

Fixed delivers a fixed amount per cycle, variable adjusts output based on demand.

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14
Q

What is the difference between a diaphragm pump and a piston pump?

A

Diaphragm pump uses a flexible diaphragm, piston pump uses a rigid piston.

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14
Q

What is the difference between a positive displacement pump and a centrifugal pump in terms of flow rate and pressure?

A

Positive displacement pumps provide constant flow; centrifugal pumps vary flow with pressure.

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15
Q

What is the difference between a single-suction pump and a double-suction pump?

A

Single-suction has one inlet, double-suction has two for high flow rates.

15
Q

What is the difference between a lobe pump and a screw pump?

A

Lobe pump uses interlocking lobes, screw pump uses a helical screw.

15
Q

What is the difference between a positive displacement pump and a dynamic pump in terms of efficiency?

A

Positive displacement pumps are more efficient at low flow rates and high pressures; dynamic pumps are more efficient at high flow rates and low pressures.

16
Q

What is the difference between a volute pump and a diffuser pump?

A

Volute pump has a spiral casing; diffuser pump has stationary vanes.

17
Q

What is the difference between a canned motor pump and a magnetic drive pump?

A

Canned motor pump integrates motor and impeller; magnetic drive uses magnetic coupling.

18
Q

What is the difference between a self-priming pump and a non-self-priming pump?

A

Self-priming can evacuate air and prime itself; non-self-priming needs a flooded suction line or external priming.

19
Q

What is the difference between a horizontal pump and a vertical pump?

A

Horizontal has a horizontal shaft on a baseplate; vertical has a vertical shaft on a pedestal or sump.

20
Q

What is the difference between a close-coupled pump and a frame-mounted pump?

A

Close-coupled has motor and impeller on a common shaft; frame-mounted has them on separate shafts with a coupling.

21
Q

What is the difference between a single-phase motor and a three-phase motor?

A

Single-phase has one power phase for low power; three-phase has three phases for high power.

21
Q

What is the difference between a fixed speed pump and a variable speed pump?

A

Fixed speed runs at constant speed and flow; variable speed adjusts speed and flow based on demand.

22
Q

What is the difference between a single-stage impeller and a multi-stage impeller?

A

Single-stage has one set of vanes; multi-stage has multiple sets for higher head.

23
Q

What is the difference between a volute casing and a diffuser casing?

A

Volute casing is spiral-shaped; diffuser casing has stationary vanes.

24
Q

What is the difference between a positive displacement pump and a peristaltic pump?

A

Positive displacement pump uses mechanical energy; peristaltic pump uses a flexible tube and rollers to move fluid.

25
Q

What is the difference between a single-phase capacitor start motor and a single-phase split-phase motor?

A

Capacitor start motor uses a capacitor to start; split-phase motor uses a centrifugal switch for starting.

26
Q

What is the difference between a single-stage centrifugal pump and a multi-stage centrifugal pump?

A

Single-stage has one impeller; multi-stage has multiple impellers for higher head.

27
Q

What is the difference between a positive displacement pump and a gear pump?

A

Gear pump uses interlocking gears; positive displacement pump uses various mechanisms to move fluid.

28
Q

What is the difference between a single-phase induction motor and a three-phase induction motor?

A

Single-phase requires a starting mechanism; three-phase is self-starting.

29
Q

What is the difference between a single-stage axial flow pump and a multi-stage axial flow pump?

A

Single-stage has one impeller; multi-stage has multiple impellers for higher head.

30
Q

What is the difference between a positive displacement pump and a screw pump?

A

Screw pump uses a helical screw; positive displacement pump uses various mechanisms to move fluid.

31
Q

What is the difference between a single-stage radial flow pump and a multi-stage radial flow pump?

A

Single-stage has one impeller; multi-stage has multiple impellers for higher head.

PPE (6 decks)

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