40 TOP FURNACE TECHNOLOGY Online Test – Multiple Choice Questions and Answers

1. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a

2. 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

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

4. Which of the following is a periodic furnace?

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

6. Which of the following is a directly fired intermittant furnace ?

7. Dampers are located

8. Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing ?

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

10. Which furnace employs natural draft ?