Lakshya Education MCQs

Question: An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
C.Low frequency induction
D.None of these
Answer: Option B

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Question 1. The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
  1.    Arc
  2.    Resistance
  3.    Low frequency induction
  4.    High frequency induction
Answer: Option D
Question 2. Calcination of limestone to produce lime is done in a __________ kiln.
  1.    Tunnel
  2.    Rotary
  3.    Vertical shaft
  4.    Both B and C
Answer: Option D
Question 3. Pot furnace which is either regenerative or recupterative, is used in the manufacture of
  1.    Glass
  2.    Stainless steel
  3.    Potteries
  4.    Refractory bricks
Answer: Option A
Question 4. Which of the following is a heat treatment furnace?
  1.    Muffle furnace
  2.    Annealing furnace
  3.    Reheating furnace
  4.    Rotary kiln
Answer: Option B
Question 5. __________ atmosphere is maintained inside an iron blast furnace.
  1.    Oxidising
  2.    Reducing
  3.    Inert
  4.    Decarburising
Answer: Option B
Question 6. The function of an economiser in a boiler is to preheat the
  1.    Feedwater
  2.    Combustion air
  3.    Pulverised coal
  4.    Furnace oil
Answer: Option A

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