JET 03 Centrifugal Pumps Flashcards Preview

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Flashcards in JET 03 Centrifugal Pumps Deck (24)
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1

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

impeller

2

Wear rings serve the same function as
wear plates.

TRUE

3

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

shims

4

Bearings support the shaft.

TRUE

5

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

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

6

How do centrifugal pumps convert
mechanical energy into hydraulic energy?

by pushing fluid into the system

7

How does the volute affect the velocity of
energy of the liquid?

converts it into pressure

8

Total head can be increased by increasing
the rpm.

TRUE

9

Bearings support the shaft.

TRUE

10

Which of the following lubricate bearings?
Select two that apply.

A. oil bath
C. grease

11

A centrifugal pump primes itself.

FALSE

12

Worn packing can cause the seal to fail.

TRUE

13

Rope packing is used in RB23 centrifugal
pumps.

TRUE

14

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

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

15

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

FALSE

16

To minimize vortexing, perform which of
the following (select three that apply):

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

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

TRUE

18

To increase NPSH-A _________ ,
_________, and _________ .

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

19

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

TRUE

20

You can operate centrifugal pumps
continuously near shutoff or zero capacity.

FALSE

21

Pumping liquid that contains abrasive
particles does not cause erosion.

FALSE

22

Air is mixed in the liquid being pumped as
a result of (select all that apply):

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

23

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

TRUE

24

When rigging up the centrifugal pump,
take into consideration _________.

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