Module Questions

Question 1

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

Answer 1

1, 2, 6

Question 2

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

Answer 2

D

Question 3

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

Answer 3

4, 1, 3

Question 4

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

Answer 4

True

Question 5

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

Answer 5

A

Question 6

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

Answer 6

116.5

Question 7

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

Answer 7

False

Question 8

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

Answer 8

False

Question 9

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

Answer 9

C

Question 10

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

Answer 10

D. 29.74

Question 11

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

Answer 11

C

Question 12

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

Answer 12

B

Question 13

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

Answer 13

A

Question 14

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

Answer 14

1,2

Question 15

True or False. A centrifugal pump will prime itself.

Answer 15

False

Question 16

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

Answer 16

1,2,5,6

Question 17

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

Answer 17

C

Question 18

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

Answer 18

B

Question 19

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

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

Answer 19

1,2

Question 20

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

Answer 20

1. Open
2. Closed
3. Open
4. Closed
5. Closed
6. Open

Question 21

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

Answer 21

B

Question 22

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

Answer 22

B

Question 23

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

Answer 23

False

Question 24

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

Answer 24

True

Question 25

``` 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 ```

Answer 25

B

Question 26

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

Answer 26

A

Question 27

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

Answer 27

Discharge: 2 Suction: 3 Impeller:11

Question 28

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

Answer 28

A

Question 29

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

Answer 29

1,2,3,5,6

Question 30

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

Answer 30

False

Question 31

True or False. Bearings support the shaft.

Answer 31

True

Question 32

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

Answer 32

True