Pumps PHEP Flashcards

1
Q

The work of pumping consists of discharging a quantity of liquid or gas against a

A

Resistance

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2
Q

The motion exerted by pumps on the fluids pumped may be due to

A

Reciprocating action
centrifugal action
jet action
all of the above

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3
Q

Fluid density, fluid height must be raised, pipe friction, and static pressure all relate to

A

Total pump head

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4
Q

Check valves are sometimes installed in the suction line of pumps to

A

Prevent suction loss or shutdown

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5
Q

What type of pump can be operated with the discharge valve closed?

A

centrifugal

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6
Q

What type of pump operates on the velocity, restriction principle?

A

ejector

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7
Q

What type of pump is best suited for the handling of dirty water

A

non-positive displacement

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8
Q

The purpose of the volute type of casing or diffusion vanes of centrifugal pumps is to

A

reduce the velocity and increase the pressure of the discharging fluid

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9
Q

The laws governing the temperature-pressure relations of the liquids explain why a force must be used to cause a liquid to flow into a pump and relate most nearly to

A

Net positive suction head

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10
Q

Inter-stage leakage in multi-stage centrifugal pumps is most usually controlled by the use of

A

Wearing rings

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11
Q

The purpose of wearing or labyrinth rings in centrifugal pumps is to

A

control inter-stage losses
reduce recircualtion losses
reduce maintenance costs
all three of the above

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12
Q

The function of a lantern ring in the stuffing box of a centrifugal pump is to

A

distribute sealing or lubricating water around the pump shaft

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13
Q

In what part of a centrifugal pump is the kinetic energy in the fluid converted to potential or pressure energy?

A

the casing

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14
Q

The head generated by the centrifugal pump is always expressed in

A

feet of liquid

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15
Q

One foot of pump head is a static force exerted by a column of water one foot high on an area of one square inch. It is equal to how many pounds of pressure?

A

.434

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16
Q

Which of the following conditions would normally act to increase the total pump head?

A

Installation of new clearance or wearing rings
Replacing old discharge piping with new piping
Extending the length of discharge piping
Repairing cavitation areas in impellers
Any or all of the above

17
Q

In a constant speed centrifugal pump, any increase in flow rate beyond that for which the pump is designed to handle will normally cause

A

A drop in both efficiency and discharge pressure

18
Q

Specific speed refers to or indicates

A

the speed a model of a given design would operate to discharge one gallon per minute against one foot head

19
Q

The most efficient type of impeller to use for conditions of small capacities and high heads would generally be the

A

radial

20
Q

Excessive vapors in the inlet or suction side of a liquid pump will cause the pump to

A

lose prime