Fuels and Combustion

371.The reaction, C + CO2 ↔ 2CO, taking place during coal gasification is called the _________ reaction.

  1. Neumann reversal
  2. Shift conversion
  3. Boudouard
  4. Reduction

Correct answer: (C)
Boudouard

372.The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

  1. CO2, O2, CO
  2. CO, O2, CO2
  3. CO2, CO, O2
  4. O2, CO2, CO

Correct answer: (A)
CO2, O2, CO

373.The shift conversion reaction taking place during water gas manufacture is given by

  1. C + H2O ↔ CO + H2
  2. C + 2H2O ↔ CO2 + 2H2
  3. CO + H2O ↔ CO2 + H2
  4. None of these

Correct answer: (C)
CO + H2O ↔ CO2 + H2

374.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

Correct answer: (B)
350 to 450

375.The weathering index of a coal

  1. Gives an idea of the fusion temperature of ash
  2. Is related to its calorific value
  3. Is a measure of its size stability, when stored & exposed to weather
  4. Is a measure of its caking tendency

Correct answer: (C)
Is a measure of its size stability, when stored & exposed to weather

376.Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in

  1. Air
  2. Oxygen
  3. Either (A) or (B)
  4. Either (A) or (B) without gain or loss of heat

Correct answer: (D)
Either (A) or (B) without gain or loss of heat

377.To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

  1. Shallow and small piles
  2. Fine sizes without the presence of any lump
  3. Closed space without any ventilation facility
  4. Large heaps with small surface to volume ratio

Correct answer: (A)
Shallow and small piles

378.Tolerable concentration of toxic carbon monoxide in atmospheric air is about _________ ppm.

  1. 50
  2. 1000
  3. 5000
  4. 10000

Correct answer: (A)
50

379.Too much of excess air in combustion results in high

  1. Fuel consumption for the same heat load
  2. Stack gas temperature
  3. Percentage of oxygen in flue gases
  4. All (A), (B) and (C)

Correct answer: (D)
All (A), (B) and (C)

380.Traces of tar fog present in the coke oven gas is removed by

  1. Cyclone separator
  2. Wet packed scrubber
  3. Electrostatic precipitator
  4. Washing with monoethanolamine

Correct answer: (C)
Electrostatic precipitator

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