Thermal efficiency of a limestone calcination rotary kiln may be around ______________ percent?

Related Mcqs:

1. The thermal efficiency of an air/fuel gas preheating recuperator may be as high as _____________ percent?

   A. 50
   B. 65
   C. 85
   D. 99

2. Thermal efficiency of an open hearth furnace may be about _____________ percent?

   A. 5
   B. 20
   C. 50
   D. 80

3. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about _____________ percent?

   A. 20
   B. 40
   C. 60
   D. 80

4. Maximum thermal efficiency of boiler may be about _____________ percent?

   A. 10
   B. 25
   C. 65
   D. 90

5. The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about ____________ percent?

   A. 15
   B. 40
   C. 70
   D. 85

6. 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

7. Cement Kiln is a___________________?

   A. Rotary Kiln
   B. Tunnel Kiln
   C. Natural draft furnace
   D. Batch furnace

8. Thermal efficiency of furnaces can be improved by____________________?

   A. Waste heat recovery from flue gas
   B. Minimising heat losses from furnace walls
   C. Maintaining proper draught
   D. All A., B. and C.

9. Which of the following furnaces will have maximum thermal efficiency ?

   A. Soaking pits
   B. Walking beam reheating furnace
   C. Boiler furnace
   D. Rotary kilns

10. Rotary kilns are used in the____________________?

    A. Calcination of limestone & dolomite
    B. Cement manufacture
    C. Both A. and B.
    D. Neither A. nor B.