Related Questions

Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value
A (1- moisture content)
B (1 + moisture content)
C 1 + moisture content
D 1 – moisture content
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by
A Preheating the combustion air
B Oxygen enrichment of combustion air
C Preheating the fuel gas
D All of the above
Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
A [

A.

B.

Presence of sulphur in the fuel fired in a furnace
A Contributes to its heating value
B Helps in electrostatic precipitation of ash from flue gases
C Corrodes ducts & air preheater, if the flue gas temperature is low
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
Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises of
A Graphite powder
B Thoria
C Zircon powder
D Beryllium
Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
A Low amount of excess combustion air
B Large quantity of excess combustion air
C Hydrocarbon fuel
D Pulverised coal as fuel

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