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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. |
Q81 ⇒ Which of the following variables affects the furnace capacity ? All (a), (b) and (c). [other wrong options] [Discuss in forum] Temperature of flue gas. Thermal conductivity of stock. Thickness of heating stock. |
Q82 ⇒ __________ atmosphere is maintained inside an iron blast furnace. Reducing [other wrong options] [Discuss in forum] Oxidising Inert Decarburising |
Q83 ⇒ Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C. 650 [other wrong options] [Discuss in forum] 250 850 1000 |
Q84 ⇒ The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent. 40 [other wrong options] [Discuss in forum] 15 70 85 |
Q85 ⇒ To reduce the stack loss, heat recovery from flue gas can be done by all (a), (b) and (c). [other wrong options] [Discuss in forum] preheating of cold stock. preheating of combustion air. steam generation in waste heat boilers. |
Q86 ⇒ Heat transfer rate to the stock/charge in the furnace does not depend upon the use of waste heat recovery equipments. [other wrong options] [Discuss in forum] emissivity of the refactory walls. size of the furance. thickness of the stock. |
Q87 ⇒ An example of shaft furnace is the blast furnace [other wrong options] [Discuss in forum] L.D. converter glass melting tank soaking pit |
Q88 ⇒ In low or standard frequency induction furnace, heat is produced by the induction and resistance. [other wrong options] [Discuss in forum] combination of induced current and skin effect. current flow through a heating element. none of these. |
Q89 ⇒ 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 Sankey diagram [other wrong options] [Discuss in forum] Ostwald chart Cox chart none of these |
Q90 ⇒ Protective gas used in the annealing furnace for steel coil comprises of 95% N2 + 5% H2 [other wrong options] [Discuss in forum] 5% H2 + 9% N2 100% CO 100 %H2 |
Q91 ⇒ Regenerators are normally provided in the all (a), (b) and (c). [other wrong options] [Discuss in forum] glass melting furnace. open hearth furnace. by product coke ovens. |
Q92 ⇒ Heat balance of furnace provides means of determining the all (a), (b) and (c). [other wrong options] [Discuss in forum] thermal efficiency of the process. sources of heat losses. scope of reduction of heat losses. |
Q93 ⇒ Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is of both (a) and (b) [other wrong options] [Discuss in forum] low emissivity high thermal conductivity neither (a) nor (b) |
Q94 ⇒ Reducing atmosphere is maintained in a blast furnace [other wrong options] [Discuss in forum] calcination kiln soaking pit L.D. converter |
Q95 ⇒ In order to maintain a reducing atmosphere in a furnace, it should have CO in flue gas [other wrong options] [Discuss in forum] no O2 in flue gas high excess air none of these |
Q96 ⇒ The heating capacity of continuous reheating furnace depends upon the all (a), (b) and (c). [other wrong options] [Discuss in forum] hearth area and furnace temperature. emissivity of the stock. ratio of wall surface to stock surface. |
Q97 ⇒ The purpose of controlling the furnace atmosphere is to prevent surface attack by either of the above [other wrong options] [Discuss in forum] oxidation/scaling decarburising sulphur penetration |
Q98 ⇒ Furnace aerodynamics is related to the __________ in the furnace. movement of gases [other wrong options] [Discuss in forum] measurement of flue gas volume temperature control pressure adjustment |
Q99 ⇒ In reverberatory furnace, charge is heated mainly by radiation of heat from the roof of the combustion chamber. [other wrong options] [Discuss in forum] conduction. natural convection. none of these. |
Q100 ⇒ Overfire burning in a furnace is a phenomenon characterised by burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air. [other wrong options] [Discuss in forum] supply of excess fuel. supply of excess air. none of these. |
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