Power Plant Engineering

11. Curtis turbine is

1. reaction steam turbine
2. pressure velocity compounded steam turbine
3. pressure compounded impulse steam turbine
4. velocity compounded impulse steam turbine

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12. Deaerative heating is done to

1. heat the water
2. heat the air in the water
3. remove dissolved gases in the water
4. none of the above

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13. Economiser is used to heat

1. air
2. feed water
3. flue gases
4. all above

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14. Economisers improve boiler efficiency by

1. 1 to 5%
2. 4 to 10%
3. 10 to 12%
4. none

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15. Edward's air pump

1. removes air and also vapour from condenser
2. removes only air from condenser
3. removes only un-condensed vapour from condenser
4. removes air alongwith vapour and also the condensed water from condenser

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16. Evaporative type of condenser has

1. steam in pipes surrounded by water
2. water in pipes surrounded by steam
3. either (a) or (b)
4. none of the above

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17. Example of overfeed type stoker is

1. chain grate
2. spreader
3. travelling grate
4. all of the above

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18. For forced draught system, the function of chimney is mainly

1. to produce draught to accelerate the combustion of fuel
2. to discharge gases high up in the atmosphere to avoid hazard
3. to reduce the temperature of the hot gases discharged
4. none of the above

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19. For Parson's reaction steam turbine, degree of reaction is

1. 75%
2. 100%
3. 50%
4. 60%

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20. For the induced draught the fan is located

1. near bottom of chimney
2. near bottom of furnace
3. at the top of the chimney
4. anywhere permissible

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