Steam Boilers Engines Nozzles and Turbines

111. Tertiary air is the air used to

1. provide air around burners for obtaining optimum combustion
2. transport and dry the coal
3. cool the scanners
4. supply air for ignitors
5. convert CO (formed in lower zone of furnace) into C02 at higher zone.

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112. The balanced draft furnace is one using

1. induced draft fan and chimney
2. induced draft fan and forced draft fan
3. forced draft fan and chimney
4. any one of the above
5. none of the above.

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113. The basic job of feed water treatment in boilers is to overcome the problem of

1. corrosion
2. scale
3. carryover
4. embrittlement
5. all of the above.

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114. The basic purpose of drum in boiler is to

1. serve as storage of steam
2. serve as storage of feed water for water wall
3. remove salts from water
4. separate steam from water
5. control level.

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115. The behaviour of coal in a furnace is determained by

1. the content of sulphur
2. the content of ash and heating value
3. the proximate analysis
4. the exact analysis
5. its type.

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116. The best suited coal for chain or travelling grate stoker boiler is

1. coking coal
2. non coking or free burning coal
3. pulverised coal
4. high sulphur coal
5. least ash content coal.

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117. The biggest size of thermal power unit operating in India is

1. 30 MW
2. 60 MW
3. 100 MW
4. 210 MW
5. 500 MW.

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118. The bituminous coal is non-caking if its carbon content is

1. 78-81%
2. 81-85%
3. 85-90%
4. 90-95%
5. 95-100%.

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119. The capacity of induced draft fan compared to forced draft fan in a boiler is

1. same
2. more
3. less
4. less or more depending on size of boiler
5. unpredictable.

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120. The change in internal energy in steam engines equals to

1. work done during the rankine cycle ;
2. work done during compression.
3. work done during adiabatic expansion
4. change in enthalpy
5. none of the above.

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