Furnace Technology MCQs with answers Page - 12

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A

Admin • 802.91K Points
Coach

Q. In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by

  • (A) Conduction
  • (B) Convection
  • (C) Radiation
  • (D) Can not be predicted

A

Admin • 802.91K Points
Coach

Q. The reason for excessive clinker formation in gas producers is the

  • (A) Use of coal/coke containing a high % of fines and ash
  • (B) Use of fuel having too low an ash fusion temperature
  • (C) Development of hot spots in the fuel bed and an abnormally high rate of gasification
  • (D) All of the above

A

Admin • 802.91K Points
Coach

Q. In a muffle furnace, the muffle

  • (A) Retards the heat transfer
  • (B) Assists in temperature equalisation in the charge
  • (C) Permits the use of controlled atmosphere for the protection of stock
  • (D) All of the above

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Admin • 802.91K Points
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Q. Example of an indirectly heated furnace is

  • (A) Hood annealing furnace
  • (B) Muffle furnace
  • (C) Both A and B
  • (D) Neither A nor B

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Admin • 802.91K Points
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Q. The advantages of firing pulverised coal in the furnace lies in the fact that, it

  • (A) Permits the use of high ash content coal
  • (B) Permits the use of low fusion point ash coal
  • (C) Accelerates the burning rate and economises on fuel consumption
  • (D) All of the above

A

Admin • 802.91K Points
Coach

Q. Artificial draught produced by a fan in the furnace can be controlled by the

  • (A) Speed of the fan
  • (B) Damper
  • (C) Variation in the pitch of fan blades
  • (D) All of the above

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Admin • 802.91K Points
Coach

Q. Heat transfer rate to the stock/charge in the furnace does not depend upon the

  • (A) Thickness of the stock
  • (B) Use of waste heat recovery equipments
  • (C) Size of the furance
  • (D) Emissivity of the refactory walls

A

Admin • 802.91K Points
Coach

Q. Heat transfer rate to the charge/stock in a furnace does not depend upon the

  • (A) Initial temperature of the charged stock
  • (B) Emissivity of refractory walls
  • (C) Flue gas temperature
  • (D) Type of fuels viz solid, liquid or gaseous

A

Admin • 802.91K Points
Coach

Q. Which of the following is not an additive for flue gases from furnace to reduce its dew-point?

  • (A) Ammonia
  • (B) Fine dolomite
  • (C) Alkaline powders
  • (D) None of these

A

Admin • 802.91K Points
Coach

Q. In low or standard frequency induction furnace, heat is produced by the

  • (A) Combination of induced current and skin effect
  • (B) Induction and resistance
  • (C) Current flow through a heating element
  • (D) None of these

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