Related Questions

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
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
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
In a furnace operation, which is not preheated?
A Solid fuels
B Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
C Both A and B
D Neither A nor B
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
A Increase
B Decrease
C Increase or decrease depending on the fuel type
D Not change
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
Combustion of fuel in a furnace with oxygen enriched air results in higher
A Flue gas volume
B Flame temperature
C Fuel consumption
D Stack loss
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
Deficiency of combustion air during combustion of a gaseous fuel
A Lengthens the flame
B Causes heat loss of fuel by its partial combustion
C Both A & B
D Shortens the flame
An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace.
A Walking beam
B Shaft
C Tunnel
D Rotary hearth

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