Furnace Technology MCQs with answers Page - 13

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A

Admin • 833K Points
Coach

Q. Tunnel kilns are usually used for

  • (A) Roasting of pyrites
  • (B) Melting of glass
  • (C) Drying/tempering of refractories
  • (D) Reheating of slabs

A

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Q. Which of the following is not a directly fired furnace?

  • (A) By-product coke oven
  • (B) Calcination kiln
  • (C) Sintering furnace
  • (D) Open hearth furnace

A

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Q. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a

  • (A) Furnace employing neutral atmosphere
  • (B) Carbon resistance furnace
  • (C) Reducing atmosphere
  • (D) Furnace employing negative pressure

A

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Q. Thermal efficiency of furnaces can be improved by

  • (A) Waste heat recovery from flue gas
  • (B) Minimising heat losses from furnace walls
  • (C) Maintaining proper draught
  • (D) All of the above

A

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Q. Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the

  • (A) Physical nature, ash content and fineness of the coal
  • (B) Amount of excess air supplied and load on the boiler
  • (C) Type of burner and combustion chamber
  • (D) All of the above

A

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Q. Ceramic recuperators compared to metallic recuperators for the same duty

  • (A) Are lighter
  • (B) Occupy more space
  • (C) Are less costly
  • (D) Have higher pressure differential between flue gas & air side

A

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Q. Regenerators compared to the recuperators for the same duty

  • (A) Occupy more space
  • (B) Are less costly
  • (C) Are of smaller size
  • (D) All of the above

A

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Q. Regenerators as compared to recuperators for the same duty

  • (A) Store smaller quantity of waste heat
  • (B) Involve higher initial cost
  • (C) Are lighter & compact
  • (D) All of the above

A

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Q. Regenerators are installed in

  • (A) Coke ovens
  • (B) Open hearth furnace
  • (C) Both A & B
  • (D) Neither A nor B

A

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Q. Use of pulverised coal in boilers provides

  • (A) Higher calorific value
  • (B) Better combustion
  • (C) Smokeless burning
  • (D) Less erosion on furnace wall