Steam Boilers Engines Nozzles and Turbines

141. The function of injector used in small steam plants is to

1. create vacuum in furnace
2. create vacuum at turbine exhaust
3. pump feed water
4. dose chemicals in feed water
5. control steam temperature by injecting water.

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142. The fusible plug in small boilers is located

1. in the drum
2. in the fire tubes
3. above steam dome
4. over the combustion chamber
5. at the inlet of chimney.

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143. The heat loss in a boiler takes place in the form of

1. heat carried away by flue gases
2. heat carried away by ash
3. moisture present in fuel and steam formed by combustion of hydrogen in fuel
4. radiation
5. all of the above.

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144. The height of chimney in a power plant is governed by

1. the draft to be created
2. limitation of construction facilities
3. control of pollution
4. quantity of flue gases to be handled
5. all of the above.

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145. The high pressure boiler is oiie producing steam at a pressure more than

1. atmospheric pressure
2. 5 kg/cm2
3. 10 kg/cm2
4. 40 kg/cm2
5. 75-80 kg/cm2.

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146. The increase in pressure

1. lowers the boiling point of a liquid
2. raises the boiling point of a liquid
3. .does not affect the boiling point of a liquid
4. reduces its volume
5. none of the above.

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147. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is

1. less
2. more
3. equal
4. may be less or more depending on temperature
5. unpredictable.

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148. The latent heat of steam with increase of pressure

1. remains same
2. increases
3. decreases
4. behaves unpredictably
5. none of the above.

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149. The lenght of Cornish boiler is of the order of

1. 2-4 m
2. 3-5 m
3. 5-7.5 m
4. 7-9 m
5. 9-11 m.

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150. The major axis of elliptical manholes on the shell should be provided

1. longitudinally
2. circumferentially
3. on dished end
4. anywhere
5. vertically.

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