Lakshya Education MCQs

Question: The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent.
Options:
A.50
B.65
C.85
D.99
Answer: Option C

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Question 1. The heating capacity of continuous reheating furnace depends upon the
  1.    Hearth area and furnace temperature
  2.    Emissivity of the stock
  3.    Ratio of wall surface to stock surface
  4.    All of the above
Answer: Option D
Question 2. Means for giving direction to the circulation of gases in furnaces are
  1.    Fans
  2.    Arrangement of heating stock in the furnaces
  3.    Location of outlet ports and heating & combustion devices
  4.    All of the above
Answer: Option D
Question 3. If fuel and air are mixed ahead of the burner, it is called a/an __________ burner.
  1.    Premix
  2.    Outside mixing type
  3.    Rotary
  4.    Diffusion
Answer: Option A
Question 4. Hearth furnaces are not used for
  1.    Roasting
  2.    Melting
  3.    Reheating
  4.    None of these
Answer: Option D
Question 5. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
  1.    < 2
  2.    < 5
  3.    < 8
  4.    < 10
Answer: Option A
Question 6. 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
Answer: Option B

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