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GATE 2015 : Metallurgical Engineering

34 pages, 55 questions, 3 questions with responses, 3 total responses,

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GATE 2015 METALLURGY- MT Q. 1 Q. 25 carry ONE mark each Q.1 Q.2 Consider the following five readings from an experiment: 19, 17, 15, 13, 11. The standard deviation of the readings is________. ( + ) ( ) is a numerical approximation for (A) Q.3 If A and B are matrices, ( (A) Q.4 (C) (B) (B) (D) Which of the following properties is intensive? (B) Gibbs free energy (D) Entropy In an Ellingham diagram, the standard free energy change for the oxidation reaction of a metal M given by: ( ) + 2( ) ( ) , is plotted as a function of temperature. The 2 slope of this line is positive because (A) S0 is positive (C) H0 is positive Q.6 (C) ) = (A) Volume (C) Chemical potential Q.5 (D) (B) S0 is negative (D) H0 is negative In froth flotation, hydrophobic mineral particles ascend with air bubbles preferentially over hydrophilic mineral particles. The figure below shows a schematic of a water droplet placed on the surfaces of two mineral P and Q. Given this information, pick the CORRECT statement from the following: (A) Mineral P ascends with air bubbles preferentially over mineral Q. (B) Mineral Q ascends with air bubbles preferentially over mineral P. (C) Both minerals P and Q ascend with the air bubbles without preference. (D) Both minerals P and Q sink to the bottom. Q.7 Which of the following oxide addition results in polymerization (i.e., network formation) in a silicate slag? (A) CaO MT (B) MgO (C) P2O5 (D) Na2O 1/11

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