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MCQs

Total Questions : 2441 | Page 21 of 245 pages
Question 201. The maximum adiabatic flame temperature is attained, when the fuel is burnt with
  1.    Theoretically required amount of air
  2.    More than theoretically required amount of air
  3.    Less than theoretically required amount of air
  4.    Theoretically required amount of oxygen
 Discuss Question
Answer: Option D. -> Theoretically required amount of oxygen
Question 202. Which of the following is not applicable to fluidised bed combustion of coal?
  1.    It can not burn low grade coal
  2.    It achieves higher fuel combustion efficiency
  3.    Less heat transfer surface area is required in boilers
  4.    None of these
 Discuss Question
Answer: Option A. -> It can not burn low grade coal
Question 203. Size of blast furnace grade coke is __________ mm.
  1.    25-80
  2.    0-15
  3.    15-25
  4.    >100
 Discuss Question
Answer: Option A. -> 25-80
Question 204. The heat of combustion of a fuel
  1.    Is equal to the heat of formation
  2.    Is always negative
  3.    Can't be known without calculating it
  4.    Is always positive
 Discuss Question
Answer: Option B. -> Is always negative
Question 205. The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always
  1.    1
  2.    < 1
  3.    > 1
  4.    Unpredictable
 Discuss Question
Answer: Option C. -> > 1
Question 206. Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)
  1.    GCV at constant pressure
  2.    GCV at constant volume
  3.    NCV at constant pressure
  4.    NCV at constant volume
 Discuss Question
Answer: Option B. -> GCV at constant volume
Question 207. Compound coke ovens are those which can be heated by
  1.    Both steam and electrical power
  2.    Lean gas (e.g., B.F. gas)
  3.    Rich gas (e.g., coke oven gas)
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 208. Which of the following is a measure of the agglutinating (i.e., binding) property of coal?
  1.    Thickness of plastic layer
  2.    Caking index
  3.    Swelling index
  4.    Gray-king index
 Discuss Question
Answer: Option B. -> Caking index
Question 209. Stack heat losses can be minimised by
  1.    Controlling the excess air
  2.    Oxygen enrichment of combustion air
  3.    Using low c.v. fuels
  4.    Maintaining proper draft in the furnace
 Discuss Question
Answer: Option A. -> Controlling the excess air
Question 210. The gas which contributes maximum to the heating value of natural gas is
  1.    CO
  2.    CO₂
  3.    H₂
  4.    CH₄
 Discuss Question
Answer: Option D. -> CH₄

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