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MCQs

Total Questions : 2441 | Page 240 of 245 pages
Question 2391. During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?
  1.    Incomplete combustion
  2.    Complete combustion
  3.    High oxygen in flue gas
  4.    None of these
 Discuss Question
Answer: Option B. -> Complete combustion
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2392. Ultimate analysis of coal determines its _______________ content?
  1.    Carbon, hydrogen, nitrogen & sulphur
  2.    Carbon, ash, sulphur & nitrogen
  3.    Carbon, sulphur, volatile matter & ash
  4.    Carbon, volatile matter, ash & moisture
 Discuss Question
Answer: Option A. -> Carbon, hydrogen, nitrogen & sulphur
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2393. 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
 Discuss Question
Answer: Option A. -> CO2, O2, CO
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2394. Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its_________________?
  1.    Caking index
  2.    Yield of carbonised products
  3.    Friability & oxygen content
  4.    Calorific value
 Discuss Question
Answer: Option C. -> Friability & oxygen content
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2395. Sometimes water is sprayed during coal charging in the coke oven, which helps in ________________?
  1.    Prevention of clinker formation in the oven
  2.    Controlling the dust nuisance while charging the coal
  3.    Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H2 in the gas (due to the endothermic reaction represented by C
  4.    All A., B. and C.
 Discuss Question
Answer: Option D. -> All A., B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2396. Critical Air Blast (CAB) value of coke is a direct measure of its__________________?
  1.    Reactivity
  2.    Hardness
  3.    Strength
  4.    None of these
 Discuss Question
Answer: Option A. -> Reactivity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2397. A particular coal is said to be free burning when it __________________?
  1.    Burns completely
  2.    Gives smokeless burning
  3.    Shows little or no fusing action
  4.    None of these
 Discuss Question
Answer: Option C. -> Shows little or no fusing action
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2398. Coal tar fuel – 200 (CTF 200) is a mixture of __________________?
  1.    Pitch and creosote oil
  2.    Light oil and pitch
  3.    Anthracene and crecosote oil
  4.    Solar oil and pitch
 Discuss Question
Answer: Option A. -> Pitch and creosote oil
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2399. Combustion of pulverised coal as compared to that of lump coal ________________?
  1.    Develops a non-luminous flame
  2.    Develops a low temperature flame
  3.    Can be done with less excess air
  4.    Provides a lower rate of heat release
 Discuss Question
Answer: Option C. -> Can be done with less excess air
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2400. Calorific value of dry wood may be around ______________ Kcal/kg?
  1.    5
  2.    50
  3.    500
  4.    5000
 Discuss Question
Answer: Option A. -> 5
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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