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MCQs

Total Questions : 2441 | Page 10 of 245 pages
Question 91. The gasification reaction represented by, C + H₂O = CO + H₂, is
  1.    Exothermic
  2.    Endothermic
  3.    Catalytic
  4.    Autocatalytic
 Discuss Question
Answer: Option B. -> Endothermic
Question 92. The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called
  1.    Fire point
  2.    Smoke point
  3.    Burning temperature
  4.    Kindling temperature
 Discuss Question
Answer: Option C. -> Burning temperature
Question 93. Atomising steam to fuel oil ratio in a burner should be around
  1.    0.5
  2.    1.5
  3.    2.5
  4.    3.5
 Discuss Question
Answer: Option A. -> 0.5
Question 94. Volumetric ratio of N₂ to O₂ in dry atmospheric air is
  1.    0.21
  2.    3.76
  3.    4.76
  4.    0.79
 Discuss Question
Answer: Option B. -> 3.76
Question 95. Combustion of pulverised coal compared to the lumpy coal
  1.    Provides better control of furnace temperature
  2.    Facilitates combustion with lower excess air
  3.    Provides higher thermal efficiency & flame temperature
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 96. Use of pulverised coal in boiler furnace provides
  1.    High calorific value
  2.    Better combustion
  3.    Smokeless burning
  4.    Less erosion on furnace walls
 Discuss Question
Answer: Option B. -> Better combustion
Question 97. The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
  1.    100 to 150
  2.    350 to 450
  3.    550 to 650
  4.    700 to 850
 Discuss Question
Answer: Option B. -> 350 to 450
Question 98. Which of the following is the maximum coal producing state in India?
  1.    Orissa
  2.    West Bengal
  3.    Jharkhand
  4.    Assam
 Discuss Question
Answer: Option C. -> Jharkhand
Question 99. The difference between total carbon and fixed carbon of coal will be minimum in case of
  1.    Lignite
  2.    Bituminous coal
  3.    Anthracite
  4.    High temperature coke (V.M < 0.5%)
 Discuss Question
Answer: Option D. -> High temperature coke (V.M < 0.5%)
Question 100. With increase in the oxygen content of the coal, its __________ decreases.
  1.    Calorific value
  2.    Caking power
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B

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