| 1. | The hydraulic efficiency of an impulse turbine is the ? | |
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ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
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ratio of the actual work available at the turbine to the energy imparted to the wheel
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ratio of the work done on the wheel to the energy of the jet
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none of the above
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Report Question| 2. | Braking jet in an impulse turbine is used ? | |
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to break the jet of water
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to bring the runner to rest in a short time
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to change the direction of runner
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none of these
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| 3. | Which of the following pump is suitable for small discharge and high heads ? | |
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Centrifugal pump
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Axial flow pump
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Mixed flow pump
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Reciprocating pump
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| 4. | Power required to drive a centrifugal pump is directly proportional to ......... of its impeller ? | |
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diameter
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square of diameter
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cube of diameter
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fourth power of diameter
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| 5. | In a reciprocating pump, air vessels are used to ? | |
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smoothen the flow
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reduce suction head
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increase delivery head
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reduce acceleration head
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| 6. | Which of the following statement is correct ? | |
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The centrifugal pump is suitable for large discharge and smaller heads
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The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump
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The efficiency of centrifugal pump is less as compared to reciprocating pump
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all of the above
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| 7. | Mechanical efficiency of a centrifugal pump is the ratio of ? | |
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energy available at the impeller to the energy supplied to the pump by the prime mover
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actual work done by the pump to the energy supplied to the pump by the prime mover
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energy supplied to the pump to the energy available at the impeller
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manometric head to the energy supplied by the impeller per kN of water
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| 8. | The cavitation in reaction turbines is avoided, to a great extent by ? | |
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installing the turbine below the tail race level
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using stainless steel runner of the turbine
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providing highly polished blades to the runner
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all of the above
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| 9. | A Pelton wheel working under a constant head and discharge, has maximum efficiency when the speed ratio is ? | |
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0.26
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0.36
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0.46
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0.56
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| 10. | Which of the following turbine is preferred for 0 to 25 m head of water ? | |
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Pelton wheel
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Kaplan turbine
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Francis turbine
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none of these
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