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MCQs

Total Questions : 1935 | Page 24 of 194 pages
Question 231. The Locomotive boiler has
  1.    137 fire tubes and 44 superheated tubes
  2.    147 fire tubes and 34 superheated tubes
  3.    157 fire tubes and 24 superheated tubes
  4.    167 fire tubes and 14 superheated tubes
 Discuss Question
Answer: Option C. -> 157 fire tubes and 24 superheated tubes
Question 232. Efficiency of Rankine cycle can be increased by
  1.    Decreasing initial steam pressure and temperature
  2.    Increasing exhaust pressure
  3.    Decreasing exhausts pressure
  4.    Increasing the expansion ratio
 Discuss Question
Answer: Option A. -> Decreasing initial steam pressure and temperature
Question 233. Benson boiler requires
  1.    No drum
  2.    One drum
  3.    Two drums
  4.    Three drums
 Discuss Question
Answer: Option A. -> No drum
Question 234. Sulphur in coal results in
  1.    Corroding air heaters
  2.    Spontaneous combustion during coal storage
  3.    Facilitating ash precipitation
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 235. The state of vapor under saturation condition is described by
  1.    Pressure alone
  2.    Temperature alone
  3.    Pressure and temperature
  4.    Pressure and dryness fraction
 Discuss Question
Answer: Option D. -> Pressure and dryness fraction
Question 236. In an impulse turbine
  1.    The steam is expanded in nozzles only and there is a pressure drop and heat drop
  2.    The steam is expanded both in fixed and moving blades continuously
  3.    The steam is expanded in moving blades only
  4.    The pressure and temperature of steam remains constant
 Discuss Question
Answer: Option A. -> The steam is expanded in nozzles only and there is a pressure drop and heat drop
Question 237. With increase in load, convection superheater has
  1.    Drooping characteristic
  2.    Linear characteristic
  3.    Rising characteristic
  4.    Flat characteristic
 Discuss Question
Answer: Option C. -> Rising characteristic
Question 238. O₂ content in atmospheric air on volume basis is
  1.    21 %
  2.    23 %
  3.    30 %
  4.    40 %
 Discuss Question
Answer: Option A. -> 21 %
Question 239. O₂ content in atmospheric air on weight basis is
  1.    21 %
  2.    23 %
  3.    30 %
  4.    40 %
 Discuss Question
Answer: Option B. -> 23 %
Question 240. 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
 Discuss Question
Answer: Option B. -> Induced draft fan and forced draft fan

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