Related Questions

Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace?
A Increase in calorific value of the fuel
B Increase in flame temperature
C Reduction in scale losses
D Saving in fuel consumption
Use of preheated air for combustion of fuel in the furnace, increases the
A Scale losses of the furnace stock
B Calorific value of the fuel
C Flame temperature
D None of these
Operation of blast furnace stove is based on the principles of a __________ furnace.
A Regenerative
B Recuperative
C Both A and B
D Neither A nor B
Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature?
A Calorific value of the fuel
B Flame temperature achieved
C Speed of combustion of fuel
D Heat transfer rate to the stock in the furnace
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because
A The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
B It reduces its calorific value tremendously
C It reduces its flame temperature tremendously
D There are chances of explosion during preheating
Advantages of use of preheated combustion air are
A Saving in fuel consumption
B Reduction in scale losses
C Increase in flame temperature
D All of the above
__________ furnace is not an electric furnace.
A Arc
B Induction
C Pot
D Resistance
Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
A Increasing the draft in the furnace
B Preheating the fuel gas
C Oxygen enrichment of combustion air
D Preheating the combustion air
Which furnace employs an I.D. fan for the removal of flue gases from the furnace?
A Coke oven
B Blast furnace stoves
C Beehive coke oven
D High pressure boiler
The electric furnace in which heat is produced by a combination of induced current and skin effect is called __________ furnace.
A Arc
B Resistance
C Low frequency induction
D High frequency induction

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