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Home⇒ Engineering⇒
Furnace technology
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent. 85 [other wrong options] [Discuss in forum] ![]() ![]() 50 65 99 |
Q2 ⇒ In which of the waste heat recovery equipment, the flow of flue gas and air is alternately reversed after a fixed interval of time ? Regenerator [other wrong options] [Discuss in forum] ![]() ![]() Recuperator Waste heat boiler None of these |
Q3 ⇒ Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/an salt bath furnace. [other wrong options] [Discuss in forum] ![]() ![]() blast furnace. steam boiler. annealing furnace. |
Q4 ⇒ In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by radiation [other wrong options] [Discuss in forum] ![]() ![]() conduction convection can not be predicted. |
Q5 ⇒ Air filtration in a furnace reduces its thermal efficiency. [other wrong options] [Discuss in forum] ![]() ![]() is indicated by flame sting out. increases the flue gas temperature. none of these. |
Q6 ⇒ Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C. 150 [other wrong options] [Discuss in forum] ![]() ![]() 50 100 250 |
Q7 ⇒ In salt bath furnace, heat is transferred to the charge mainly by conduction [other wrong options] [Discuss in forum] ![]() ![]() convection radiation none of these |
Q8 ⇒ Artificial draught produced by a fan in the furnace can be controlled by the all (a), (b) and (c). [other wrong options] [Discuss in forum] ![]() ![]() speed of the fan. damper. variation in the pitch of fan blades. |
Q9 ⇒ An example of recuperative furnace is the soaking pit [other wrong options] [Discuss in forum] ![]() ![]() open hearth furnace coke ovens none of these |
Q10 ⇒ In a furnace operation, which is not preheated ? Both (a) and (b). [other wrong options] [Discuss in forum] ![]() ![]() Solid fuels. Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.). Neither (a) nor (b). |
Q11 ⇒ A refractory wall separating the stock and the source of heat is provided in a muffle furnace [other wrong options] [Discuss in forum] ![]() ![]() updraft kiln continuous furnace none of these |
Q12 ⇒ In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the all (a), (b) and (c) [other wrong options] [Discuss in forum] ![]() ![]() rate of firing and emissivity of flame. thermal conductivity of the charge & structural materials of furnace. nature of process ; whether batch, continuous or intermittant. |
Q13 ⇒ Which furnace employs preheating, heating and soaking zones ? Reheating furnace [other wrong options] [Discuss in forum] ![]() ![]() Soaking pit Open hearth furnace Cupola |
Q14 ⇒ Which of the following is the most suitable for preheating combustion air above 650°C ? Ceramic recuperator [other wrong options] [Discuss in forum] ![]() ![]() Regenerator Metallic recuperator None of these |
Q15 ⇒ Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by all (a), (b) & (c). [other wrong options] [Discuss in forum] ![]() ![]() preheating the combustion air. oxygen enrichment of combustion air. preheating the fuel gas. |
Q16 ⇒ Pulverised fuel fired furnaces employ __________ fuel firing. all (a), (b) and (c) [other wrong options] [Discuss in forum] ![]() ![]() horizontal vertical tangential |
Q17 ⇒ Power required in case of forced draught as compared to induced draught (for the same draught produced) is less [other wrong options] [Discuss in forum] ![]() ![]() same more either more or less; depends on the flue gas density |
Q18 ⇒ Which of the following accentuates clinker-ing troubles on furnace grate burning coal? All (a), (b) and (c). [other wrong options] [Discuss in forum] ![]() ![]() Low reactivity of carbonised residue containing high proportion of iron & sulphur. Low forced draft & fuel bed temperature. Thick firebed and preheated primary air. |
Q19 ⇒ Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a carbon resistance furnace. [other wrong options] [Discuss in forum] ![]() ![]() furnace employing neutral atmosphere. reducing atmosphere. furnace employing negative pressure. |
Q20 ⇒ Rotary kilns are used in the both (a) and (b). [other wrong options] [Discuss in forum] ![]() ![]() calcination of limestone & dolomite. cement manufacture. neither (a) nor (6). |
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