Lakshya Education MCQs

Question: The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
Options:
A.Arc
B.Resistance
C.Low frequency induction
D.High frequency induction
Answer: Option D

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More Questions on This Topic :

Question 1. 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 2. 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 3. Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
  1.    Preheating the combustion air
  2.    Oxygen enrichment of combustion air
  3.    Preheating the fuel gas
  4.    All of the above
Answer: Option D
Question 4. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
  1.    Resistance
  2.    Arc
  3.    Low frequency induction
  4.    None of these
Answer: Option B
Question 5. 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 6. __________ atmosphere is maintained inside an iron blast furnace.
  1.    Oxidising
  2.    Reducing
  3.    Inert
  4.    Decarburising
Answer: Option B

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