The heating capacity of muffle furnace depends on the_________________?

Related Mcqs:

1. The heating capacity of muffle furnace depends on the____________________?

   A. Surface area & emissivity of the stock
   B. Properties of the muffle wall (temperature, area, and emissivity)
   C. Both A. & B.
   D. Neither A. nor B.

2. The main function of a muffle in the muffle furnace is to__________________?

   A. Protect the charge from the effects of the products of combustion
   B. Smooth out temperature inequalities on the combustion side of the muffle wall
   C. Both A. & B.
   D. Neither A. nor B.

3. In a muffle furnace, the muffle_________________?

   A. Retards the heat transfer
   B. Assists in temperature equalisation in the charge
   C. Permits the use of controlled atmosphere for the protection of stock
   D. All A., B. and C.

4. Specific heating capacity of a furnace is expressed as_____________________?

   A. Weight heated/hr
   B. Weight heated/furnace volume
   C. Weight heated/hr/furnace volume
   D. None of these

5. 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.

6. The rate of scaling of furnace stock depends upon the_________________?

   A. Temperature
   B. Time
   C. Nature of atmosphere
   D. All A., B. and C.

7. 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

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. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?

   A. 10-15
   B. 25-30
   C. 45-50
   D. 65-70

10. 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