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MCQs

Total Questions : 757 | Page 76 of 76 pages
Question 751. Fuel economy in an industrial furnace operation cannot be achieved by the use of__________________?
  1.    Stoichiometric combustion air
  2.    Non-preheated combustion air
  3.    Combustion air not enriched with oxygen
  4.    Recuperators
 Discuss Question
Answer: Option A. -> Stoichiometric combustion air
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 752. Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?
  1.    Ammonia
  2.    Fine dolomite
  3.    Alkaline powders
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 753. Which furnace employs preheating, heating and soaking zones ?
  1.    Soaking pit
  2.    Reheating furnace
  3.    Open hearth furnace
  4.    Cupola
 Discuss Question
Answer: Option B. -> Reheating furnace
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 754. Ostwald charts are meant for__________________?
  1.    Computing the excess/deficiency of combustion air
  2.    Calculation of flue gas temperature
  3.    Computation of flue gas analysis
  4.    None of these
 Discuss Question
Answer: Option A. -> Computing the excess/deficiency of combustion air
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 755. The function of an economiser in a boiler is to preheat the _____________________?
  1.    Feedwater
  2.    Combustion air
  3.    Pulverised coal
  4.    Furnace oil
 Discuss Question
Answer: Option A. -> Feedwater
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 756. Pick out the wrong statement ?
  1.    Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
  2.    Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures
  3.    Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 757. Which of the following furnaces will have maximum thermal efficiency ?
  1.    Soaking pits
  2.    Walking beam reheating furnace
  3.    Boiler furnace
  4.    Rotary kilns
 Discuss Question
Answer: Option C. -> Boiler furnace
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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