Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an__________________?

Related Mcqs:

1. 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

2. In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by__________________?

   A. Conduction
   B. Convection
   C. Radiation
   D. Cannot be predicted

3. 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

4. If the flame is produced under the hearth and then sweeps up into the heating chamber, this is called a/an ______________ furnace?

   A. Sidefired
   B. Underfired
   C. Covered
   D. Recirculating

5. Maximum heat transfer in high temperature furnaces is by____________________?

   A. Conduction
   B. Convection
   C. Radiation
   D. Either A., B. or C.; depends on the type of furnace

6. 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

7. 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

8. 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.

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.