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Home⇒ Engineering⇒
Refractory 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. |
Q41 ⇒ Which is the stable form of silica upto 1470°C ? Tridymite [other wrong options] [Discuss in forum] Quartz Cristobalite None of these |
Q42 ⇒ Rate of slag attack on refractories increases with rise in temperature due to the decreased viscosity of slag. [other wrong options] [Discuss in forum] increased thermal conductivity of brick. oxidising condition in the furnace. none of these. |
Q43 ⇒ Porosity of fireclay refractories is __________ percent. 43033 [other wrong options] [Discuss in forum] 42865 25-35 35-50 |
Q44 ⇒ Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the washing action of metal. [other wrong options] [Discuss in forum] corrosion by layer of slag. both (a) & (b). neither (a) nor (b). |
Q45 ⇒ 'Spinel', a refractory mineral is chemically represented as MgAl2O4 [other wrong options] [Discuss in forum] MgAl2O3 MgSO4 MgAl2O3.2H2O |
Q46 ⇒ To resist spalling tendency, a refractory should have all (a), (b) and (c). [other wrong options] [Discuss in forum] greater diffusivity. low specific heat. low thermal co-efficient of expansion. |
Q47 ⇒ Silica bricks have low spalling resistance below 600°C, due to its high co-efficient of expansion upto this temperature. [other wrong options] [Discuss in forum] very high thermal conductivity. high thermal diffusivity. low refractoriness. |
Q48 ⇒ Chrome magnesite is not used in the wear out lining of steel melting furnaces. [other wrong options] [Discuss in forum] inner lining of L.D. converter. aluminium melting furnaces. all (a), and (b) and (c) |
Q49 ⇒ Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns. 2700 [other wrong options] [Discuss in forum] 1800 2200 2400 |
Q50 ⇒ Fusion point of a basic refractory material is reduced by the addition of acid oxides. [other wrong options] [Discuss in forum] increased by the addition of acid oxides. not affected by the addition of acid oxides. always less than 1000°C. |
Q51 ⇒ Magnesite bricks are used in those parts of furnaces, which are required to resist corrosive basic slag. [other wrong options] [Discuss in forum] subjected to temperature fluctuation. subjected to high load. none of these. |
Q52 ⇒ Thermal diffusivity of a refractory brick is high, when its __________ is high. thermal conductivity [other wrong options] [Discuss in forum] density specific heat none of these |
Q53 ⇒ Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C. 270 [other wrong options] [Discuss in forum] 770 570 70 |
Q54 ⇒ Spray test determines the __________ of refractories. resistance to slag penetration [other wrong options] [Discuss in forum] resistance to CO attack RUL permanent linear change |
Q55 ⇒ Which of the following is not an acidic refractory ? Magnesia bricks [other wrong options] [Discuss in forum] Silica bricks Fireclay bricks Bauxite bricks |
Q56 ⇒ High thermal conductivity of a refractory material is not important, when it is to be used in the blast furnace [other wrong options] [Discuss in forum] coke oven regenarators muffle furnace recuperators |
Q57 ⇒ An indication of degree of firing in silica brick is its specific gravity [other wrong options] [Discuss in forum] fusion point RUL none of these |
Q58 ⇒ Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ? Tar bonded dolomite bricks [other wrong options] [Discuss in forum] Fireclay bricks Mullite bricks Magnesite bricks |
Q59 ⇒ Magnesite refractories are used for the construction of those furnaces, which are both (b) and (c) [other wrong options] [Discuss in forum] not required to resist the corrosive action of basic slag. not subjected to fluctuation in temperature. used for raising & maintaining high temperature. |
Q60 ⇒ Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ? L.D. converter [other wrong options] [Discuss in forum] Soaking pits Ceheating furnace Rotary lime kiln |
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