Which one shows the diagrammatic heat balance in a furnace ?

Related Mcqs:

1. 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.

2. 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

3. 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

4. Heat balance of furnace provides means of determining the_________________?

   A. Thermal efficiency of the process
   B. Sources of heat losses
   C. Scope of reduction of heat losses
   D. All A., B. and C.

5. 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

6. 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

7. 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

8. Rate of heat release in a furnace, which is the measure of heat intensity, is defined as_________________?

   A. kcal/hr/m3 combustion space
   B. kcal/m3 combustion space
   C. kcal/hr
   D. None of these

9. 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.

10. While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about _____________ °C?

    A. 2000
    B. 3000
    C. 4500
    D. 6000