The electric furnace in which heat is produced by a combination of induced current and skin effect is called _____________ furnace?

Related Mcqs:

1. 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

2. 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

3. _____________ furnace is not an electric furnace?

   A. Arc
   B. Induction
   C. Pot
   D. Resistance

4. 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.

5. 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

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. In low or standard frequency induction furnace, heat is produced by the_______________________?

   A. Combination of induced current and skin effect
   B. Induction and resistance
   C. Current flow through a heating element
   D. None of these

8. Furnace aerodynamics is related to the _____________ in the furnace?

   A. Movement of gases
   B. Measurement of flue gas volume
   C. Temperature control
   D. Pressure adjustment

9. 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

10. 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.