JET 03 Centrifugal Pumps Flashcards

1
Q

____________ is the rotating element through which liquid passes in a centrifugal pump?

A

impeller

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2
Q

Wear rings serve the same function as

wear plates.

A

TRUE

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3
Q

Which of the following is used to make
fine adjustments to the clearance between
the plates and impeller?

A

shims

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4
Q

Bearings support the shaft.

A

TRUE

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5
Q

Which of the following drive mechanisms
are used for the Schlumberger centrifugal
pumps? Select four that apply.

A

A. power-takeoff
B. hydraulic
C. electric
D. diesel

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6
Q

How do centrifugal pumps convert

mechanical energy into hydraulic energy?

A

by pushing fluid into the system

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7
Q

How does the volute affect the velocity of

energy of the liquid?

A

converts it into pressure

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8
Q

Total head can be increased by increasing

the rpm.

A

TRUE

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9
Q

Bearings support the shaft.

A

TRUE

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10
Q

Which of the following lubricate bearings?

Select two that apply.

A

A. oil bath

C. grease

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11
Q

A centrifugal pump primes itself.

A

FALSE

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12
Q

Worn packing can cause the seal to fail.

A

TRUE

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13
Q

Rope packing is used in RB23 centrifugal

pumps.

A

TRUE

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14
Q

Centrifugal pumps that use mechanical
seals are _________, _________, and
_________.

A

A. RA 4x5
B. RA 5x6
D. RB 2x3x11

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15
Q

Total suction head is the difference
between the levels of the discharge and
suction liquid.

A

FALSE

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16
Q
To minimize vortexing, perform which of
the following (select three that apply):
A
A. Install crossbars in the suction of the
pump and tank.
C. Lower the pump rate.
D. Float a large piece of wood over the
suction opening in the tank.
17
Q

The pressure within the pump must not fall
below the vapour pressure of the liquid at
the pumping temperature.

A

TRUE

18
Q

To increase NPSH-A _________ ,

_________, and _________ .

A

A. Raise the liquid level.
B. Lower the pump.
D. Use a booster pump.

19
Q

An operation is parallel when the
discharge sides of two pumps are
connected to the same outlet.

A

TRUE

20
Q

You can operate centrifugal pumps

continuously near shutoff or zero capacity.

A

FALSE

21
Q

Pumping liquid that contains abrasive

particles does not cause erosion.

A

FALSE

22
Q

Air is mixed in the liquid being pumped as

a result of (select all that apply):

A

A. leaky suction lines
B. improperly assembled stuffing box
C. inadequate seals on the suction lift
hook-up

23
Q

Series operations are not recommended
because of the high incidence of seal
failures in the second pump.

A

TRUE

24
Q

When rigging up the centrifugal pump,

take into consideration _________.

A

A. rate
B. distance
C. pressure
D. viscosity of the fluid