Steam Boilers Engines Nozzles and Turbines

121. The coal requirement per kW hour generation in the thermal power plant is of the order of

1. 0.1 to 0.2 kg
2. 0.2 to 0.4 kg
3. 0.6 to 0.8 kg
4. 1.0 to 1.5 kg
5. 1.5 to 2 kg.

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122. The condition of steam in boiler drum is always

1. dry
2. wet
3. saturated
4. supersaturated
5. superheated.

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123. The critical pressure at which latent heat of vaporisation is zero is

1. 225.65 kgf/cm2
2. 273 kgf/cm2
3. 100 kgf/cm2
4. 1 kgf/cm2
5. - 1 kgf/cm2.

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124. The crown of the fire box is made hemispherical in order to

1. give maximum space
2. give maximum strength
3. withstand pressure inside boiler ,
4. resist intense heat in fire box
5. enable easy,manufacture.

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125. The diameter of Cornish boiler is of the order of

1. 1-2 m
2. 1.5-2.5 m
3. 2-3 m
4. 2.5-3.5 m
5. 0.5 to 1 m.

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126. The diameter of cylindrical shell of the Lancashire boiler is of the order of

1. 1 tp 1.25m
2. 1 to 1.75 m
3. 2 to 4 m
4. 1.75 to 2.75 m
5. 2.25 to 4.5 m.

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127. The diameter of fire tube of Cornish boiler compared to its shell is

1. one half
2. one third
3. one-fifth
4. two-fifth
5. three-fifth.

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128. The diameter of fire tubes in Cochran boiler is of the order of

1. 2 cm
2. 6 Cm
3. 8 cm
4. 12 cm
5. 15 cm.

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129. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is

1. one-half
2. one-third
3. one-fourth
4. one-fifth
5. two-fifth.

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130. The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

1. more
2. less
3. same
4. could be more or less depending on other factors
5. none of the above.

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