Fuels and Combustion

421.Which of the following has the highest calorific value (kcal/Nm3)?

  1. Carburetted water gas
  2. Gobar gas
  3. Natural gas
  4. LPG

Correct answer: (D)
LPG

422.Which of the following has the highest calorific value?

  1. Lignite
  2. Sub-bituminous coal
  3. Anthracite
  4. Peat

Correct answer: (C)
Anthracite

423.Which of the following has the highest flame speed?

  1. CO
  2. H2
  3. CH4
  4. C2H6

Correct answer: (B)
H2

424.Which of the following has the highest flame velocity?

  1. H2
  2. CO
  3. CH4
  4. C2H6

Correct answer: (A)
H2

425.Which of the following has the highest gross calorific value?

  1. Blast furnace gas
  2. Coke oven gas
  3. Carburetted water gas
  4. Oil refinery gas

Correct answer: (D)
Oil refinery gas

426.Which of the following has the highest heat of combustion?

  1. H2
  2. CO
  3. CH4
  4. C2H6

Correct answer: (D)
C2H6

427.Which of the following has the highest theoretical flame temperature?

  1. Blast furnace gas
  2. Hydrogen
  3. Acetylene
  4. Coke oven gas

Correct answer: (C)
Acetylene

428.Which of the following has the least calorific value (kcal/Nm3)?

  1. Blast furnace gas
  2. Coke oven gas
  3. Sewage gas
  4. Natural gas

Correct answer: (A)
Blast furnace gas

429.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

Correct answer: (B)
Caking index

430.Which of the following is a poisonous fuel gas?

  1. Coke oven gas
  2. Blast furnace gas
  3. Natural gas
  4. None of these

Correct answer: (B)
Blast furnace gas

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