A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as?

LohaHridoy
  1. Superheater
  2. Air-preheater
  3. Economizer
  4. Injector

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Answer: Option 2

Let'

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Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)?

Answer: Option 1 Fourier's law of heat conduction is k. A. (dT/dx) where Q = Amount of heat flow through the body in unit time, A = Surface area of heat...

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Which furnace employs an I.D. fan for the removal of flue gases from the furnace?

Answer: Option 4 Let'

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The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.?

Answer: Option 4 Let'

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Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace?

Answer: Option 2 Let'

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Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of?

Answer: Option 3 Let'

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Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?

Answer: Option 1 Let'

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

Answer: Option 4 Let'

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In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time?

Answer: Option 2 Let'

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Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?

Answer: Option 1 Let'

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Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

Answer: Option 1 Let'

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