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MCQs

Total Questions : 2441 | Page 9 of 245 pages
Question 81. Which of the following is the most poisonous gas?
  1.    Coke oven gas
  2.    Producer gas
  3.    Blast furnace gas
  4.    L.D. converter gas
 Discuss Question
Answer: Option D. -> L.D. converter gas
Question 82. Calorific value as determined by bomb calorimeter is the
  1.    Higher calorific value at constant volume
  2.    Gross calorific value at constant pressure
  3.    Lower calorific value at constant pressure
  4.    Net calorific value at constant volume
 Discuss Question
Answer: Option A. -> Higher calorific value at constant volume
Question 83. Efficient burning of anthracite coal requires
  1.    Low preheat of air
  2.    Fine grinding
  3.    High excess air
  4.    All of the above
 Discuss Question
Answer: Option B. -> Fine grinding
Question 84. Washing of coal does not reduce its
  1.    S & P content
  2.    Heating value
  3.    Fusion point of ash
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 85. Nitrogen in coal
  1.    Is present upto 1-2%
  2.    Comes from protein in parent vegetable matter
  3.    Is recovered as ammonia during its carbonisation
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 86. Oxygen required for theoretically complete combustion of 1 Nm³ methane is __________ Nm³.
  1.    2
  2.    4
  3.    6
  4.    1
 Discuss Question
Answer: Option A. -> 2
Question 87. A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the
  1.    Presence of large quantity of hydrogen in the fuel
  2.    Low calorific value of the fuel
  3.    High sulphur content in the fuel
  4.    Lack of thorough mixing of fuel with air
 Discuss Question
Answer: Option D. -> Lack of thorough mixing of fuel with air
Question 88. Coking time in narrow by-product coke ovens is around __________ hours.
  1.    18
  2.    48
  3.    8
  4.    80
 Discuss Question
Answer: Option A. -> 18
Question 89. A travelling grate stoker is meant for the efficient burning of __________ coal.
  1.    Caking
  2.    Pulverised
  3.    Non-caking
  4.    High ash
 Discuss Question
Answer: Option C. -> Non-caking
Question 90. A coal having higher volatile matter content will necessarily have lower
  1.    Ash fusion temperature
  2.    Calorific value
  3.    Ignition temperature
  4.    Caking index
 Discuss Question
Answer: Option C. -> Ignition temperature

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