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Total Questions : 2441 | Page 7 of 245 pages
Question 61. Dry air requirement for burning 1 Nm³ of CO to CO₂ may be around __________ Nm³.
  1.    2.4
  2.    1.75
  3.    0.87
  4.    11.4
 Discuss Question
Answer: Option A. -> 2.4
Question 62. With increase in moisture content of coal, its
  1.    Calorific value increases sometimes
  2.    Bulk density always decreases
  3.    Clinkering tendency during combustion increases
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 63. Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if
  1.    It contains large amount of volatile matter
  2.    It is stored in tall heaps
  3.    Smaller fines are stored in large quantity
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 64. Pick out the wrong statement.
  1.    Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal
  2.    Ammonia is recovered in the form of ammonium sulphate in direct process of by-product recovery
  3.    A high swelling index number of coking coal indicates poor caking properties of coal
  4.    Wash oil is used for scrubbing benzol from coke oven gas
 Discuss Question
Answer: Option C. -> A high swelling index number of coking coal indicates poor caking properties of coal
Question 65. Gray King Assay and Swelling Index of a coal is a measure of its
  1.    Swelling characteristics
  2.    Abradability
  3.    Agglutinating properties
  4.    Resistance to impact breakage
 Discuss Question
Answer: Option A. -> Swelling characteristics
Question 66. Caking index of a coal is a measure of its
  1.    Abradability
  2.    Reactivity
  3.    Agglutinating (binding) properties
  4.    Porosity
 Discuss Question
Answer: Option C. -> Agglutinating (binding) properties
Question 67. Micum Index of a coke is a measure of its
  1.    Reactivity
  2.    Porosity
  3.    Bulk density
  4.    Hardness & strength
 Discuss Question
Answer: Option D. -> Hardness & strength
Question 68. Weathering of coal during storage causes
  1.    Reduction in coal size
  2.    Increase in its friability
  3.    Decrease in its caking capacity
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 69. Low temperature oxidation of coal is accelerated by the
  1.    Storage in large heaps
  2.    Storage in compressed piles
  3.    Absence of porous or friable particles
  4.    All of the above
 Discuss Question
Answer: Option A. -> Storage in large heaps
Question 70. Washing of coal is done to reduce the
  1.    Inherent impurities
  2.    Adhering impurities
  3.    Mineral matter
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C

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