Question Bank: Important Long Questions

Chapter 16.

PUMPS

I. Answer the following:

1. What is a reciprocating pump?

2. Why is a reciprocating pump called Positive Displacement Pump?

3. Describe the working of a single stage reciprocating pump with a neat sketch.

4. Explain single acting reciprocating pump and list the components with a neat sketch.

 5. How do you classify the reciprocating pumps?

6. Compare centrifugal pump and reciprocating pump.

7. Differentiate:

8. Between a single acting and double acting reciprocating pump

.9. Between a single cylinder and double cylinder reciprocating pump.

10. Define the terms: Slip, Percentage Slip and Negative Slip of a reciprocating pump.

11. Explain the term slip with reference to reciprocating pumps.

12. What is an indicator diagram of a reciprocating pump? What useful information does it give?

13. What is a centrifugal pump? On what principle does it work?

14. Explain the working of a single stage centrifugal pump with sketches. top

15. Differentiate between volute casing and vortex casing for the centrifugal pump. 16. What do you understand by the term ‘Multi-stage Pump'? Explain clearly the difference between a single stage and a multi-stage centrifugal pump.

17. State the differences between a closed, semi-closed and open impeller.

18. Define the terms:

(a) Suction head (c) Delivery head

(b) Static head (d) Mechanical efficiency

19. Differentiate between volute casing and diffuser casing with suitable sketches. 20. Discuss the various methods adopted to increase the efficiency of a centrifugal pump.

 21. If a centrifugal pump does not deliver any water when started, what may be the probable causes and how can they be remedied?

22. What is priming? Why is it necessary?

23. Define cavitation. What are its causes?

24. What are the effects of cavitation? Give the necessary precautions against cavitation.