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MCQs

Total Questions : 757 | Page 3 of 76 pages
Question 21. Forced recirculation of furnace gases is practised
  1.    To increase heat transfer by convection
  2.    To ensure uniform temperature
  3.    In furnaces, operating below 750°C
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 22. The amount of combustible escaping uncon-sumed from the furnace, depends upon the
  1.    Air supplied and furnace temperature
  2.    Burner design (thoroughness of mixing versus stratification)
  3.    Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 23. Power required in case of forced draught as compared to induced draught (for the same draught produced) is
  1.    Same
  2.    Less
  3.    More
  4.    Either more or less; depends on the flue gas density
 Discuss Question
Answer: Option B. -> Less
Question 24. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
  1.    Ostwald chart
  2.    Cox chart
  3.    Sankey diagram
  4.    None of these
 Discuss Question
Answer: Option C. -> Sankey diagram
Question 25. Which is the most thermally efficient furnace?
  1.    Reheating furnace
  2.    Reverberatory furnace
  3.    Rotary kilns
  4.    Boiler furnace
 Discuss Question
Answer: Option D. -> Boiler furnace
Question 26. An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.
  1.    Walking beam
  2.    Shaft
  3.    Tunnel
  4.    Rotary hearth
 Discuss Question
Answer: Option A. -> Walking beam
Question 27. Which of the following variables affects the furnace capacity?
  1.    Temperature of flue gas
  2.    Thermal conductivity of stock
  3.    Thickness of heating stock
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 28. Air filtration in a furnace
  1.    Reduces its thermal efficiency
  2.    Is indicated by flame sting out
  3.    Increases the flue gas temperature
  4.    None of these
 Discuss Question
Answer: Option A. -> Reduces its thermal efficiency
Question 29. In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of
  1.    Transportation of coal
  2.    Drying of coal
  3.    Combustion of coal by supplying it around the burner
  4.    Preheating the primary air
 Discuss Question
Answer: Option C. -> Combustion of coal by supplying it around the burner
Question 30. If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an __________ furnace.
  1.    Sidefired
  2.    Underfired
  3.    Covered
  4.    Recirculating
 Discuss Question
Answer: Option B. -> Underfired

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