40 TOP FURNACE TECHNOLOGY Online Test – Multiple Choice Questions and Answers 1. Which of the following is a periodic furnace? Soaking pit Reheating furnace Rotary kiln Tunnel kiln 2. Dampers are located near the top of the chimney after the I.D. fan anywhere after the I.D. fan before the I.D fan 3. Which of the following is a directly fired intermittant furnace ? Walking beam reheating furnace Tunnel kiln Reverberatory furnace Tower furnace 4. In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by convection can not be predicted conduction radiation 5. Which furnace employs natural draft ? Coke oven L.D. converter Boiler Rotary kilns 6. Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a furnace employing negative pressure furnace employing neutral atmosphere carbon resistance furnace reducing atmosphere 7. Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing ? Ash disposal problem Erosion of induced draft fan blades Excessive fly ash discharge from the stack Higher power consumption in its transportation 8. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent 65-70 25-30 10-15 45-50 9. 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 Cox chart Sankey diagram Ostwald chart none of these 10. Which of the following furnaces will have maximum thermal efficiency ? Soaking pits Boiler furnace Walking beam reheating furnace Rotary kilns Loading … Question 1 of 10
