305

Question 1

An archimedian screw pumps water by rotating ___ in a ___.

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

Answer 2

Insulated pipes

Question 3

A centrifugal pump is suitable for pumping waste because of the ___ head requirement and because the pump can move ___

Answer 3

Low; small particles

Question 4

Pumps for high viscosity materials generally need to be ___pumps

Answer 4

Positive displacement

Question 5

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

Answer 5

Piston

Question 6

The eye of a pump impeller is above the level of the supply liquid in the ___ condition

Answer 6

Suction lift

Question 7

Total dynamic head is the sum of the ___ the ___ and the ___

Answer 7

Static head; head loss; velocity head

Question 8

The horsepower input to a pump is called ___ horsepower

Answer 8

Brake

Question 9

In order to use the performance curve for a centrifugal pump, you must know the pumps ___ and its ___

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 ___% of the pumps used in industrial planta

Answer 11

80

Question 12

In a multistage centrifugal pump each stage increases the ___ of the fluid

Answer 12

Velocity

Question 13

The open impeller is used mainly for pumping fluids containing ___ solids

Answer 13

Large

Question 14

In a centrifugal pump wear rings prevent damage to the ___ and ___

Answer 14

Impeller; casing

Question 15

The purpose of shaft sleeves is to prevent ___ from causing wear on the ___

Answer 15

Packing ; shaft

Question 16

In a line shaft turbine the ____ surrounds the ____

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 an 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 fluid is carried between the teeth of ___ and the ___

Answer 21

Both gears; pump housing

Question 22

In an external gear pump, fluid is carried between the teeth of ___ and the ___

Answer 22

Both gears, crescent

Question 23

Lobe pumps are similar to ____ pumps in their construction and operation

Answer 23

External-gear

Question 24

In a screw pump, fluid moves because of the

Answer 24

Progressive cavities between threads

Question 25

The diameter of the impeller if a vane pump is ___ the diameter of the housing. The centerline of the impeller is ___ the centerline of the housing

Answer 25

Smaller than; offset from

Question 28

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

Answer 28

Air

Question 29

Single acting reciprocating pumps discharge fluid on the ___ stroke

Answer 29

Forward only

Question 30

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

Answer 30

Electric motor

Question 31

Most metering pumps are

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 ___ pumps

Answer 35

Vane

Question 36

In a flexibl-tube pump, the ___ forces the fluid out the discharge port

Answer 36

Roller

Question 37

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

Answer 37

Magnetic -drive

Question 38

A dry type dump pump retains its prime, because the

Answer 38

Suction intake is above the impeller

Question 39

The ___ and the ___ 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 ___ because it ___

Answer 41

Desirable, lubricates the shaft

Question 42

Pumps designed for use under suction lift conditions require

Answer 42

Injection type stuffing box

Question 43

Pumps that operate at temperatures over 450F are usually 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

Why forks the seal in a packingless seal

Answer 45

Boller condensate

Question 46

Overfilling the oil reservoirs on a pump can result in

Answer 46

Overheating bearings

Question 47

Grease used for lubricating the bearings of pumps should be free of

Answer 47

Mineral fillers

Question 48

If a pumps bearing seals need frequent replacement, the problem may be caused by a

Answer 48

Rough shaft

Question 49

The major maintenance problem 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 problem may be ___ but you should check the ___ before replacing them.

Answer 50

Worn piston rings, internal check valves

Question 51

Compared to a piston, the plunger of a power pump is typically ___ and has a ___ stroke

Answer 51

Longer ; longer

Question 52

An air driven reciprocating pump can deliver fluid at a pressure higher that the supplied air pressure if the fluid piston is __ the air piston

Answer 52

Smaller in diameter than