Question: 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…

Question: Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C. [A]. 50 [B]. 100 [C]. 150 [D]. 250 Answer: Option C Explanation: No answer description available for this question.

Question: Large tonnage of refractory bricks are dried in a [A]. shaft furnace [B]. rotary hearth furnace [C]. tunnel kiln [D]. muffle furnace Answer: Option C Explanation: No answer description available for this question.

Question: Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C. [A]. 250 [B]. 650 [C]. 850 [D]. 1000 Answer: Option B Explanation: No answer description available for this question.

Question: 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 Answer: Option B Explanation: No answer…

Question: Heat transfer rate to the charge/stock in a furnace does not depend upon the [A]. type of fuels viz solid, liquid or gaseous. [B]. flue gas temperature. [C]. emissivity of refractory walls. [D]. initial temperature of the charged stock.…

Question: In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of [A]. use of non-preheated combustion air. [B]. use of pulverised solid fuels. [C]. imperfect mixing of fuel &…

Question: 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 Answer: Option B Explanation: No answer description available for…

Question: __________ is an indirectly heated furnace. [A]. Open hearth furnace [B]. Muffle furnace [C]. Soaking pit [D]. Reheating furnace Answer: Option B Explanation: No answer description available for this question.

Question: An improved and fuel efficient version of the pusher type reheating furnace is the __________ furnace. [A]. walking beam [B]. shaft [C]. tunnel [D]. rotary hearth Answer: Option A Explanation: No answer description available for this question.