A. Air supplied and furnace temperature
B. Burner design (thoroughness of mixing versus stratification)
C. Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by
change of direction)
D. All A., B. and C.
Related Mcqs:
- Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?
A. Emissivity of the refractory walls
B. Size of the furnace
C. Use of waste heat recovery equipments
D. Thickness of the stock - Heat transfer rate to the charge/stock in a furnace does not depend upon the________________?
A. Type of fuels viz. solid, liquid or gaseous
B. Flue gas temperature
C. Emissivity of refractory walls
D. Initial temperature of the charged stock - Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C ?
A. 5
B. 60
C. 20
D. 40 - In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the__________________?
A. Rate of firing and emissivity of flame
B. Thermal conductivity of the charge & structural materials of furnace
C. Nature of process; whether batch, continuous or intermittent
D. All A., B. and C. - Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the_________________?
A. Quantity & temperature of waste gas
B. Dust concentration & nature of dust in waste gas
C. Corrosive nature of the waste gas
D. All A., B. and C. - The rate of scaling of furnace stock depends upon the_________________?
A. Temperature
B. Time
C. Nature of atmosphere
D. All A., B. and C. - Size of the combustion chamber of a furnace depends upon the ___________________?
A. Heat release rate of the fuel
B. Preheat temperature of fuel & air
C. Method of mixing the fuel & air
D. All A., B. and C. - Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the__________________?
A. Physical nature, ash content and fineness of the coal
B. Amount of excess air supplied and load on the boiler
C. Type of burner and combustion chamber
D. All A., B. and C. - 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 - 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
