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Chapter 3.6 - Pumps and Pumping System

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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Question bank for Energy Managers & Energy Auditors Chapter 3.6: Pumps & Pumping System Part I: Objective type questions and answers 1. Positive displacement pumps are generally less efficient than centrifugal pumps. State whether the statement is true or false 2. Installing larger diameter pipe in pumping system results in reduction in-------a) static head 3. c) both a and b d) neither a nor b Generally water pipe lines are designed with water velocity of a) < 1 m/s 4. b) frictional head b) up to 2.0 m/s c) > 2 m/s d) None of the above What is the impact on flow and pressure when the impeller of a pump is trimmed? a) Flow decreases with increased pressure c) Both pressure and flow decreases 5. b) Both flow and pressure increases d) None of the above For high flow requirement, pumps are generally operated in a) parallel b) series c) any of the above d) none of the above 6. In case of throttling operation, the pump has to overcome additional pressure in order to deliver the reduced flow . Please indicate whether this statement is (a) True or (b) False? 7. Friction losses in a pumping system is-----a) proportional to 1/Q c) proportional to 1/Q3 8. b) proportional to Q2 d) proportional to 1/Q4 For large capacity centrifugal pumps, design efficiencies are in the range of a) around 70% 9. b) around 85% The moving part in centrifugal pump is ----a) impeller 10. b) diffuser d) neither a nor b b) Speed control c) Impeller trimming d) None In case of increased suction lift from open wells, the delivery flow rate-------a) increases 12. c) both a & b The most efficient method of flow control in a pumping system is------a) Throttling the flow 11. c) around 95% d) any of above b) decreases c) remains same d) none of the above Pump efficiency generally increases with specific speed. State whether the statement is True or False. 3.6 pumps - revised (table format) 41

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