Pumps

Question 1

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

Answer 1

Thread; trough

Question 2

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)

Answer 2

Insulated pipes

Question 3

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

Answer 3

Low; small particles

Question 4

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

Answer 4

Positive-displacement

Question 5

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

Answer 5

Piston

Question 6

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

Answer 6

Suction lift

Question 7

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

Answer 7

Static head; head loss; velocity head

Question 8

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

Answer 8

Brake

Question 9

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

Answer 9

Speed; Impeller diameter

Question 10

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

Answer 10

Efficiency

Question 11

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

Answer 11

80

Question 12

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

Answer 12

Velocity

Question 13

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

Answer 13

Large

Question 14

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

Answer 14

Impeller; casing

Question 15

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

Answer 15

Packing; shaft

Question 16

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

Answer 16

Bowl; Impeller

Question 17

Diffuser vanes in an axial-flow propeller pump

Answer 17

Straighten the fluid flow

Question 18

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

Answer 18

Impeller

Question 19

What causes electrochemical corrosion in a pump?

Answer 19

Combining incompatible materials

Question 20

Regenerative turbine pumps can be used only to pump fluids with

Answer 20

Low viscosity

Question 21

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

Answer 21

Both gears; pump housing

Question 22

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

Answer 22

Both gears; crescent

Question 23

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

Answer 23

External-gear

Question 24

In a screw pump, fluid moves because of the

Answer 24

Progressing cavities between threads

Question 25

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.

Answer 25

Smaller than; offset from

Question 26

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

Answer 26

Air

Question 27

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

Answer 27

Forward (only)

Question 28

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

Answer 28

Electric motor

Question 29

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

Answer 29

Longer; longer

Question 30

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

Answer 30

Smaller in diameter than

Question 31

Most metering pumps are [BLANK] pumps

Answer 31

Reciprocating

Question 32

Most metering pumps are lubricated by the

Answer 32

Fluids they pump

Question 33

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

Answer 33

Hydraulic fluid

Question 34

What actuates the valves of diaphragm pumps?

Answer 34

Fluids being pumped

Question 35

Rotary pumps used for metering are usually [BLANK] pumps

Answer 35

Vane

Question 36

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

Answer 36

Roller

Question 37

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

Answer 37

Magnetic-drive

Question 38

A dry type sump pump retains its prime because the

Answer 38

Suction intake is above the impeller

Question 39

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

Answer 39

Cylinder sleeves; valve seats

Question 40

The advantage of a vortex pump is that the

Answer 40

Fluid makes little contact with the impeller

Question 41

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

Answer 41

Desirable; lubricates the shaft

Question 42

Pumps designed for use under suction lift conditions require an

Answer 42

Injection-type stuffing box

Question 43

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

Answer 43

Aluminum

Question 44

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

Answer 44

Shut off and lock out the power

Question 45

What forms the seal in a packingless seal?

Answer 45

Boiler condensate

Question 46

Overfilling the oil reservoirs on a pump can result in

Answer 46

Overheated bearings

Question 47

Greases used for lubricating bearings of pumps should be free of

Answer 47

Mineral fillers

Question 48

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

Answer 48

Rough shaft

Question 49

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

Answer 49

Bearings and seals

Question 50

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

Answer 50

Worn piston rings; internal check valves