| 1. | The maximum number of jets, generally, employed in an impulse turbine without jet interference are ? | |
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two
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four
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six
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eight
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Report Question| 2. | The specific speed of a centrifugal pump, delivering 750 litres of water per second against a head of 15 metres at 725 r.p.m., is ? | |
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24.8 r.p.m.
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48.2 r.p.m.
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82.4 r.p.m.
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248 r.p.m.
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| 3. | Which of the following pump is successfully used for lifting water from deep wells? ? | |
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Centrifugal pump
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Reciprocating pump
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Jet pump
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Air lift pump
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| 4. | A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used ? | |
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Pelton wheel with one nozzle
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Pelton wheel with two or more nozzle
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Kaplan turbine
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Francis turbine
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| 5. | An impulse turbine is used for ? | |
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low head of water
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high head of water
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medium head of water
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high discharge
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| 6. | A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit power of the wheel is ? | |
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0.25 kW
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0.75 kW
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1.75 kW
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3.75 kW
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| 7. | Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft ? | |
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Hydraulic ram
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Hydraulic intensifier
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Hydraulic torque converter
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Hydraulic accumulator
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| 8. | The width of the bucket for a Pelton wheel is generally .......... the diameter of jet. ? | |
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double
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three times
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four times
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five times
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| 9. | A Francis turbine is used when the available head of water is ? | |
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0 to 25 m
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25 m to 250 m
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above 250 m
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none of these
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| 10. | If the net positive suction head (NPSH) requirement for the pump is not satisfied, then ? | |
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no flow will take place
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cavitation will be formed
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efficiency will be low
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excessive power will be consumed
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