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MCQs

Total Questions : 1935 | Page 10 of 194 pages
Question 91. Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of
  1.    Higher effectiveness of boiler
  2.    High calorific value coal being burnt
  3.    Fouling of heat transfer surfaces
  4.    Raising of steam temperature
 Discuss Question
Answer: Option C. -> Fouling of heat transfer surfaces
Question 92. The mechanical draught _________ with the amount of smoke.
  1.    Increases
  2.    Decreases
  3.    Does not effect
  4.    None of these
 Discuss Question
Answer: Option B. -> Decreases
Question 93. A _________ in a boiler is used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit.
  1.    Blow off cock
  2.    Fusible plug
  3.    Stop valve
  4.    Safety valve
 Discuss Question
Answer: Option B. -> Fusible plug
Question 94. The radius of a dished head is taken approximately as
  1.    One fourth
  2.    Half
  3.    One
  4.    Two
 Discuss Question
Answer: Option C. -> One
Question 95. Boiler parameters are expressed by
  1.    Tonnes/hr. of steam
  2.    Pressure of steam in kg/cm²
  3.    Temperature of steam in °C
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 96. The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks
  1.    180° to each other
  2.    90° to each other
  3.    0° to each other
  4.    None of these
 Discuss Question
Answer: Option A. -> 180° to each other
Question 97. In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of
  1.    10 atmospheres
  2.    20 atmospheres
  3.    30 atmospheres
  4.    40 atmospheres
 Discuss Question
Answer: Option B. -> 20 atmospheres
Question 98. The draught may be produced by a
  1.    Mechanical fan
  2.    Chimney
  3.    A steam jet
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 99. At which pressure the properties of water and steam become identical
  1.    0.1 kg/cm²
  2.    1 kg/cm²
  3.    100 kg/cm²
  4.    225.6 kg/cm²
 Discuss Question
Answer: Option D. -> 225.6 kg/cm²
Question 100. The average operating pressure of Benson boiler is
  1.    100 bar
  2.    150 bar
  3.    200 bar
  4.    250 bar
 Discuss Question
Answer: Option D. -> 250 bar

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