| 1. | The blade friction in the impulse turbine reduces the velocity of steam by.................while it passes over the blades ? | |
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10 to 15%
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15 to 20%
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20 to 30%
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30 to 40%
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Report Question| 2. | Multi-stage steam turbines are of the ? | |
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velocity compounded type
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reaction type
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pressure compounded type
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all of these
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| 3. | The ratio of the isentropic heat drop to the heat supplied, is called ? | |
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reheat factor
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stage efficiency
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internal efficiency
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Rankine efficiency
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| 4. | The purpose of governing in steam turbines is to ? | |
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maintain the speed of the turbine
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reduce the effective heat drop
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reheat the steam and improve its quality
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completely balance against end thrust
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| 5. | Stage efficiency is also known as ? | |
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diagram efficiency
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nozzle efficiency
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gross efficiency
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none of these
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| 6. | A nozzle is said to be a convergent nozzle ? | |
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when the cross-section of the nozzle increases continuously from entrance to exit
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when the cross-section of the nozzle decreases continuously from entrance to exit
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when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
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none of the above
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| 7. | The efficiency of steam turbines may be improved by ? | |
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reheating of steam
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regenerative feed heating
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binary vapour plant
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any one of these
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| 8. | Parson's turbine is a ? | |
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simple impulse turbine
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simple reaction turbine
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impulse-reaction turbine
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none of these
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| 9. | A regenerative steam cycle renders ? | |
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increased work output per unit mass of steam
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decreased work output per unit mass of steam
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increased thermal efficiency
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decreased work output per unit mass of steam as well as increased thermal efficiency
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| 10. | Parson's reaction turbine is a .......... reaction turbine ? | |
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40 percent
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50 percent
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60 percent
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70 percent
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