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Centrifugal Pumps > Module Questions > Flashcards

Module Questions Flashcards

1
Q

Which of the following are characteristics of packing materials? Select all the correct answers.

  1. An ability to prevent excessive leakage
  2. An absence of abrasive effect on the shaft
  3. An ability to promote excessive leakage
  4. A high coefficient of friction
  5. A presence of abrasive effect on the shaft
  6. A low coefficient of friction
A

1, 2, 6

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2
Q 
Which of the following are used to make fine adjustments to the clearance between the plates and the impeller?
A) Wear rings
B) Packing
C) Bearings
D) Shims
A

D

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3
Q

Which of the following is a positive displacement pump? Select all the correct answers.

  1. Vane pump
  2. Centrifugal pump
  3. Piston pump
  4. Gear pump
A

4, 1, 3

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4
Q

True or False. The only way to prevent the undesirable effects of cavitation is to ensure that NPSH-A is greater than NPSH-R.

A

True

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5
Q

Which of the following is the power required to drive the pump?
A) Brake horsepower
B) Hydraulic horsepower

A

A

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6
Q 
Suppose the impeller diameter of a C-pump is 8.625 and the rpm is 2300.  Which of the following is the maximum head this C-pump will develop?
A) 86.6 ft
B) 126. 4 ft
C) 96.7 ft
D) 116. 5 ft
A

116.5

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7
Q

True or False. The bearing box contains the bearing lubrication system

A

False

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8
Q

True or False. If the discharge of one pump feeds into the suction of a second pump, the pumps are operating in parallel.

A

False

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9
Q 
Which of the following is the rotating element where liquid passes in a centrifugal pump?
A) Wear ring
B) Packing
C) Impeller
D) Wear plate
A

C

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10
Q 
Suppose the impeller diameter is 8.375 and the rpm is 2100.  Which of the following is the discharge pressure if the fluid has a specific gravity of 0.75?
A) 76.80 psi
B) 91.59 psi
C) 68.69 psi
D) 29.74 psi
A

D. 29.74

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11
Q 
Which of the following acts like a seal around the moving shaft?
A) Bearing Frame
B) Wear Plates
C) Rope Packing
D) Stuffing Box
A

C

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12
Q 
Which of the following is the optimum performance clearance between the impeller and wear plates?
A) 1/8 inch
B) 1/16 inch
C) 1/4 inch
D) 1/2 inch
A

B

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13
Q

How does the volute affect the velocity energy of the liquid?
A) Converts it into pressure
B) Converts it into heat

A

A

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14
Q

Which of the following provides an area to seal against leakage from the pump and along the shaft? Select all the correct answers.

  1. Stuffing box
  2. Packing material
  3. Bearing frame
  4. Casing
A

1,2

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15
Q

True or False. A centrifugal pump will prime itself.

A

False

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16
Q

Which of the following drive mechanisms are found on Schlumberger C-pumps? Select all the correct answers.

  1. Hydraulic
  2. Power-Take-Off
  3. Gas
  4. Water
  5. Electric
  6. Diesel
A

1,2,5,6

17
Q 
Which of the following provides a surface and a seal between the casing and the impeller?
A) Bearings
B) Shims
C) Wear Plates
D) Packing
A

C

18
Q

Which of the following is the best lubrication system?
A) Grease
B) Oil
C) Self-lubricating

A

B

19
Q

Which of the following lubricate bearings? Select all the correct answers

  1. Oil bath
  2. Grease
  3. Gel
  4. Water
A

1,2

20
Q

Identify each of the following pumps as being either an example of an open impeller or a closed impeller.

  1. LaBour
  2. RA02
  3. RA45
  4. RB23
  5. RB02
  6. RA56
A
  1. Open
  2. Closed
  3. Open
  4. Closed
  5. Closed
  6. Open
21
Q

Which of the following is the horsepower output of the pump?
A) Brake Horsepower
B) Hydraulic Horsepower

A

B

22
Q

Which of the following is the formula for calculating pump efficiency?
A) BHP/HHP
B) HHP/BHP

A

B

23
Q

True or False. All displacement pumps have positive seals between the inlet and outlet ports.

A

False

24
Q

True or False. Total head can only be increased by increasing the rpm.

A

True

25
Q 
How do pumps convert mechanical energy into hydraulic energy?
A) By pushing mud into the system
B) By pushing fluid into the system
C) By pushing gas into the system
D) By pushing air into the system
A

B

26
Q 
Which of the following supports the impeller and transmits rotation/torque?
A) Shaft
B) Shims
C) Power Source
D) Stuffing box
A

A

27
Q 
Match each number on a 2X3X11 pump with its representative component.
Discharge Port
Suction Port
Impeller
11
3
2
A

Discharge: 2
Suction: 3
Impeller:11

28
Q

Where does centrifugal force propel fluid?
A) outward
B) inward

A

A

29
Q

Which of the following increases NPSH-A? Select all the correct answers.

  1. Reducing the friction losses in the suction piping
  2. Sub-cooling the liquid to reduce the Pv
  3. Lowering the pump
  4. Employing an inducer upstream of the impeller
  5. Raising the liquid level
  6. Using a booster pump
A

1,2,3,5,6

30
Q

True or False. Mechanical seals are usually lubricated with oil from an internal lubricating system.

A

False

31
Q

True or False. Bearings support the shaft.

A

True

32
Q

True or False. Wear rings serve the same function as wear plates.

A

True

Centrifugal Pumps (2 decks)

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