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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. |
Q61 ⇒ Heat transfer rate to the charge/stock in a furnace does not depend upon the type of fuels viz solid, liquid or gaseous. [other wrong options] [Discuss in forum] flue gas temperature. emissivity of refractory walls. initial temperature of the charged stock. |
Q62 ⇒ Which of the following is not an additive for flue gases from furnace to reduce its dew-point? None of these [other wrong options] [Discuss in forum] Ammonia Fine dolomite Alkaline powders |
Q63 ⇒ Combustion of fuel in a furnace with oxygen enriched air results in higher flame temperature [other wrong options] [Discuss in forum] flue gas volume fuel consumption stack loss |
Q64 ⇒ __________ is an indirectly heated furnace. Muffle furnace [other wrong options] [Discuss in forum] Open hearth furnace Soaking pit Reheating furnace |
Q65 ⇒ Circulation of gases in furnace is caused by the all (a), (b) and (c). [other wrong options] [Discuss in forum] change in volume during a change of temperature. difference in density between hot and cold gases. furnace pressure in conjunction with draft in flues. |
Q66 ⇒ Use of pulverised coal in boilers provides better combustion [other wrong options] [Discuss in forum] higher calorific value smokeless burning less erosion on furnace wall. |
Q67 ⇒ Which one is not an induced draught furnace? Blast furnace stove [other wrong options] [Discuss in forum] Sintering furnace High pressure boiler None of these |
Q68 ⇒ Which of the following furnaces will have maximum thermal efficiency ? Boiler furnace [other wrong options] [Discuss in forum] Soaking pits Walking beam reheating furnace Rotary kilns |
Q69 ⇒ Which of the following is not a recuperative furnace ? Coke oven. [other wrong options] [Discuss in forum] Soaking pit Reheating furnace Steamboiler |
Q70 ⇒ Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent. 25-30 [other wrong options] [Discuss in forum] 43023 45-50 65-70 |
Q71 ⇒ Decarburisation of steel all (a), (b) and (c). [other wrong options] [Discuss in forum] is the removal of carbon from iron carbide (Fe3C). affects its crystalline structure. is favoured by CO2. |
Q72 ⇒ Design of waste heat boiler for recovery of waste heat from furnace gases depends upon the dust concentration & nature of dust in waste gas. [other wrong options] [Discuss in forum] quantity & temperature of waste gas. corrosive nature of the waste gas. all (a), (b) and (c). |
Q73 ⇒ Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an all (a), (b) and (c) [other wrong options] [Discuss in forum] economiser steam superheater air preheater |
Q74 ⇒ The main function of a muffle in the muffle furnace is to both (a) & (b) [other wrong options] [Discuss in forum] protect the charge from the effects of the products of combustion. smooth out temperature inequalities on the combustion side of the muffle wall. neither (a) nor (b) |
Q75 ⇒ Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ? Regenerator. [other wrong options] [Discuss in forum] Economiser. Ceramic recuperator. Waste heat boiler. |
Q76 ⇒ In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of combustion of coal by supplying it around the burner. [other wrong options] [Discuss in forum] transportation of coal. drying of coal. preheating the primary air. |
Q77 ⇒ The advantages of firing pulverised coal in the furnace lies in the fact that, it accelerates the burning rate and economises on fuel consumption. [other wrong options] [Discuss in forum] permits the use of high ash content coal. permits the use of low fusion point ash coal. all (a), (b) and (c). |
Q78 ⇒ Oxygen enrichment of combustion air does not result in increase of the oxygen in the flue gas. [other wrong options] [Discuss in forum] flame temperature. stack loss. heat transfer rate in the furnace. |
Q79 ⇒ Unit of furnace loading is ton stock/hr/m2 hearth area [other wrong options] [Discuss in forum] ton stock/hr ton stock/m2 hearth area both (b) and (c) |
Q80 ⇒ Which of the following advantages is not associated with the use of preheated air for combustion of a fuel in the furnace ? Increase in calorific value of the fuel. [other wrong options] [Discuss in forum] Increase in flame temperature. Reduction in scale losses. Saving in fuel consumption. |
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