| 1. | Which of the following is not a reaction turbine ? | |
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Furneyron turbine
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Jonval turbine
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Thomson's turbine
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Pelton wheel
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Report Question| 2. | In an outward flow reaction turbine ? | |
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the water flows parallel to the axis of the wheel
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the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel
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the water enters the wheel at the outer periphery and then flows towards the centre of the wheel
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the flow of water is partly radial and partly axial
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| 3. | The jet ratio is defined as the ratio of the ? | |
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diameter of jet to the diameter of Pelton wheel
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velocity of jet to the velocity of Pelton wheel
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diameter of Pelton wheel to the diameter of jet
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velocity of Pelton wheel to the velocity of jet
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| 4. | The mechanical efficiency of an impulse turbine is ? | |
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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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| 5. | A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ......... of the jet velocity ? | |
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one-half
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one-third
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two-third
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three-fourth
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| 6. | The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is ? | |
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40 %
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50 %
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60 %
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80 %
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| 7. | Which of the following statement is wrong ? | |
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The reaction turbines are used for low head and high discharge
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The angle of taper on draft tube is less than 8°
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An impulse turbine is generally fitted slightly above the tail race
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A Francis turbine is an impulse turbine
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| 8. | The overall efficiency of a reaction turbine is the ratio of ? | |
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power produced by the turbine to the energy actually supplied by the turbine
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actual work available at the turbine to the energy imparted to the wheel
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work done on the wheel to the energy (or head of water) actually supplied to the turbine
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none of the above
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| 9. | Multi-stage centrifugal pumps are used to ? | |
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give high discharge
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produce high heads
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pump viscous fluids
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all of these
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| 10. | The speed of an imaginary turbine, identical with the given turbine, which will develop a unit power under a unit head, is known as ? | |
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normal speed
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unit speed
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specific speed
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none of these
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