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.
Related Mcqs:
- 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 - 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 - 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. - Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?
A. Economiser
B. Regenerator
C. Ceramic recuperator
D. Waste heat boiler - An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called ____________ furnace?
A. Resistance
B. Arc
C. Low frequency induction
D. None of these - 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 - Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?
A. Ammonia
B. Fine dolomite
C. Alkaline powders
D. None of these - Scaling of furnace stock is reduced by _______________ in flue gas?
A. CO
B. H2
C. High CO/CO2
D. All A., B. & C. - In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the__________________?
A. Ostwald chart
B. Cox chart
C. Sankey diagram
D. None of these
