Related Mcqs:

1. Ceramic recuperators compared to metallic recuperators for the same duty_________________?

   A. Are lighter
   B. Occupy more space
   C. Are less costly
   D. Have higher pressure differential between flue gas & air side

2. Regenerators compared to the recuperators for the same duty__________________?

   A. Occupy more space
   B. Are less costly
   C. Are of smaller size
   D. All A., B. and C.

3. Regenerators are used for waste heat recovery in____________________?

   A. By-product coke ovens
   B. Beehive coke oven
   C. Blast furnace stoves
   D. Soaking pits

4. Regenerators are installed in_______________?

   A. Coke ovens
   B. Open hearth furnace
   C. Both A. & B.
   D. Neither A. nor B.

5. Regenerators are normally provided in the____________________?

   A. Glass melting furnace
   B. Open hearth furnace
   C. By product coke ovens
   D. All A., B. and C.

6. Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above _____________ °C?

   A. 250
   B. 650
   C. 850
   D. 1000

7. Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above _____________ °C, because corrosion prevails at higher temperatures?

   A. 350
   B. 750
   C. 1050
   D. 1250

8. 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

9. Power required in case of forced draught as compared to induced draught (for the same draught produced) is___________________?

   A. Same
   B. Less
   C. More
   D. Either more or less; depends on the flue gas density

10. In a furnace employing forced draught as compared to induced draught______________________?

    A. Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
    B. The fan operates hot and hence blades are liable to corrosion and erosion
    C. Positive pressure exists in the furnace
    D. None of these