305

Question 1

an Archimedean screw pumps water by rotating a ___ in a ___

Answer 1

thread, trough

Question 2

if a substance needs to remain within a limited range of temperatures as it follows 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 ___ pump

Answer 4

positive displacement

Question 5

which kind of pump is generally used for moving grease mastic other near solid materials

Answer 5

piston

Question 6

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

Answer 6

suction lift

Question 7

TDH is the sum of the

Answer 7

static head, the head loss, and the velocity head

Question 8

the horsepower input to a pump is called ___ HP

Answer 8

brake

Question 9

in order to use the performance curve for a centrifugal pump you must know the pumps

Answer 9

speed and 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 setting

Answer 11

80%

Question 12

in a multi stage 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 wearing rings prevent damage to the

Answer 14

impeller and casing

Question 15

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

Answer 15

packing

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 metals

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 internal 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 operations

Answer 23

external gear

Question 24

in a screw pump fluid moves because of the

Answer 24

progressing cavities between threads

Question 25

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

Answer 25

smaller than, offset from

Question 26

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

Answer 26

air

Question 27

single acting reciprocating pumps discharge fluids on the ___ stroke

Answer 27

forward

Question 28

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

Answer 28

electric motor

Question 29

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

Answer 29

longer, longer

Question 30

air driven reciprocating pump deliver pump at pressure higher than supplied air pressure if the fluid piston is ___ the air piston

Answer 30

smaller in diameter than

Question 31

most metering pumps are ___ pumps

Answer 31

reciprocating

Question 32

most metering pumps are lubricated by the ___

Answer 32

fluids in the pump

Question 33

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 flexible tube pump the ___ forces fluid out the discharge port

Answer 36

roller

Question 37

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 sump pump retaining 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 rotary pump is that the

Answer 40

fluid makes little contact with the impeller

Question 41

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 an

Answer 42

injection type stuffing box

Question 43

pumps that operate at temperatures over 450 degrees are usually packed with

Answer 43

aluminum

Question 44

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

Answer 44

shut off and lockout power

Question 45

what forms the seal in packingless seal

Answer 45

baler condesate

Question 46

overfilling the oil reservoirs on a pump can result in

Answer 46

overheating

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 cause 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 problem may be ____ , but you should check the ___ before replacing them

Answer 50

worn piston rings, internal check valves