Day 1 Exam

Question 1

1. What is the maximum pressure rating of the G head on Dowell cementing unit?

Answer 1

C. 10,000 Psi

Question 2

2. Name one cause of cavitation for a triplex pump?

Answer 2

C. Pumping too fast for the pressuring pump to keep up

Question 3

3. In any PG series triplex, which of the following is the pressure limitation referring to:

Answer 3

C. Maximum rod loading

Question 4

4. Why are the burst discs fitted in the suction valves?

Answer 4

C. Bleed off plunger pressure

Question 5

5. The power end recommended oil is:

Answer 5

C. SAE 90 weight

Question 6

6. The normal oil pressure in the power end is:

Answer 6

B. 25-50 PSI

Question 7

7. The recommended oil to be used to lubricate the packing is:

Answer 7

C. SAE 30 weight

Question 8

8. A PG series pump is fitted with 3 inch plungers and operating at 10000 Psi, what is the rod loading (force) acting on the power end:

Answer 8

B. 70,685 Pounds

Question 9

9. What will happen if the filter on the power end lubrication system is plugged?

Answer 9

C. The bypass valve opens at 75 psi and lubrication continues

Question 10

10. What is the maximum rate you can pump with 5 inches triplex pump?

Answer 10

B. 10.3 BPM

Question 11

11. Select the false statement about centrifugal pumps:

A. C-pumps are self primed because the displacement tanks are always above the c-pump and the hydrostatic force prime the c-pump.
B. C-pumps are not self primed
C. The shaft has to support lots of loads like: axial, torque, radial and abrasion.
D. Hydraulic motor, P.T.O and electric motor are some of the power source for centrifugal pumps.
E. Cavitation is the phenomenon that occurs when pressure of liquid in suction is reduced below its vapor pressure.

Answer 11

A. C-pumps are self primed because the displacement tanks are always above the c-pump and the hydrostatic force prime the c-pump.

Question 12

12. What factors can affect the discharge pressure developed by the centrifugal pump?

Answer 12

A. RPM
B. Density of the fluid
C. Type of the impeller

Question 13

13. Why is it acceptable to close a valve in the discharge line of a centrifugal pump:

Answer 13

C. Because of the space between the impeller and the wear plates

Question 14

14. Which type of pressure and rates are related to the type of the following impellers? (Mark only the ones that have everything correct)

A. Closed impeller - high pressure-low rate
B. Open impeller - high pressure - low rate
C. Open impeller - high rate - high pressure
D. Closed impeller - high rate -low pressure

Answer 14

A. Closed impeller - high pressure-low rate

Question 15

15. What does the number values represent for the RB 2x3x11?

Answer 15

E. 2 in - discharge, 3 in - suction, 11 in - impeller

Question 16

16. If a centrifugal pump is not performing as much as it should, what might be wrong?

Answer 16

A. Not enough suction head
B. Worn impeller and/or wear plates
C. Worn out packing
D. Leaks in the volute