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MCQs

Total Questions : 2441 | Page 20 of 245 pages
Question 191. High excess air in combustion of fuels results in
  1.    Increased fuel consumption
  2.    Incomplete combustion
  3.    Smoky flame
  4.    None of these
 Discuss Question
Answer: Option A. -> Increased fuel consumption
Question 192. Combustion of pulverised fuel
  1.    Requires larger combustion chamber than rich gaseous fuel
  2.    In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
  3.    Suppresses the discharge of fine dust and grit into atmosphere
  4.    All of the above
 Discuss Question
Answer: Option A. -> Requires larger combustion chamber than rich gaseous fuel
Question 193. The internal energy of the combustion products is __________ compared to that of reactants.
  1.    More
  2.    Less
  3.    Equal
  4.    More or less ; (depends on the state of fuel.)
 Discuss Question
Answer: Option B. -> Less
Question 194. For every 10% increase in the excess air; the fuel consumption increases by __________ percent.
  1.    0.1
  2.    2
  3.    5
  4.    10
 Discuss Question
Answer: Option A. -> 0.1
Question 195. Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about____°C.
  1.    70
  2.    85
  3.    105
  4.    145
 Discuss Question
Answer: Option C. -> 105
Question 196. Fixed carbon in coal is defined as
  1.    That present in volatile matters
  2.    The total quantity of carbon present in the coal
  3.    Hundred minus the percentage of volatile matter, ash and moisture
  4.    The one which is present in the residue after combustion
 Discuss Question
Answer: Option C. -> Hundred minus the percentage of volatile matter, ash and moisture
Question 197. The most matured coal out of the following is
  1.    Lignite
  2.    Semi-anthracite
  3.    Sub-bituminous
  4.    Bituminous
 Discuss Question
Answer: Option B. -> Semi-anthracite
Question 198. Yield of charcoal in high temperature carbonisation of wood is about __________ percent.
  1.    10
  2.    25
  3.    50
  4.    75
 Discuss Question
Answer: Option B. -> 25
Question 199. While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at
  1.    Dankuni (West Bengal)
  2.    Dhanbad
  3.    Singreni (AP.)
  4.    Raniganj
 Discuss Question
Answer: Option A. -> Dankuni (West Bengal)
Question 200. 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
 Discuss Question
Answer: Option A. -> Shallow and small piles

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