51. The example of regenerative furnace is/are A. Coke oven furnace B. Open heath furnace C. Socking pit D. Both A and B Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
52. The refractory brick which has good thermal shock resistance at high temnperature but cracks on cooling below 400°C is A. magnesite B. chrome C. silica D. fireclay Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
53. Low temperature carbonization A. produces higher quantity of gas than high temperature carbonization B. is mainly for producing the smokeless domestic coke C. produces less quantity of tar than high temperature carbonization D. is meant for the production of 'metallurgical coke' Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
54. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the A. hearth of the blast furnace B. nuclear reactors, missiles & space crafts C. insulation of high temperature furnaces D. roof of electric furnaces Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
55. Which of the following refractory materials is not used in the BOF (LD) working lining? A. Tar bonded dolomite B. Pitch bonded magnesite C. Fired and pitch impregnated magnesite D. Graphite-alumina composite Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
56. Which of the following constituents of coal is the most important in the production of coke? A. ash B. moisture C. Volatiles D. carbon Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
57. M10 index of coke indicates. A. Compressive strength B. hardness C. abrasion resistance D. impact stregth Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
58. Which of the following furnace is used for iron making A. LD furnace B. Electric Arc Furnace C. Open heath furnace D. Blast furnace Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
59. With increase in the porosity, thermal spalling resistance of fireclay brick A. increases B. decreases C. remains same D. may increase or decrease Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
60. What is chemical formula of chromite A. FeCr2O4 B. MgCO3 C. CaCO3 D. 3Al2O3.2SiO2 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
