Download GTU BE/B.Tech 2018 Winter 3rd Sem New 2132102 Metallurgical Thermodynamics Question Paper

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Seat No.: Enrolment No.

GUJARAT TECHNOLOGICAL UNIVERSITY

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BE - SEMESTER-III (New) EXAMINATION — WINTER 2018

Subject Code: 2132102 Date: 01/12/2018

Subject Name: Metallurgical Thermodynamics

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

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1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Explain basic terms in thermodynamics: 03

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1. Isolated system,
2. Closed system,
3. Open System.

(b) What is the significance of the first law of thermodynamics? 04

(c) What is Free Energy? Explain the concept of Gibb’s Free Energy. 07

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Q.2 (a) Multiple Choice Questions: 03

1. In the Ellingham diagram, AG vs. T plot for 2C+O2 -> 2CO with a negative gradient intersects the plot of 2Fe + 3O2 -> Fe2O3 with a positive gradient at 700 degree C. This implies that
   1. It is feasible to oxidize iron using C at a temperature above 700 degree C
   2. It is feasible to reduce Fe2O3 using C at a temperature below 700 degree C
   3. It is feasible to sinter iron powder with C packing at a temperature below 700 degree C
   4. It is feasible to sinter iron powder with C packing at a temperature above 700 degree C

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2. With regard to enthalpy, which one of the following is true?
   1. Enthalpy is the total heat content
   2. H=E+PV
   3. dH=dq+ VdP
   4. All of the above

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3. Which one of the following sentences is true?
   1. A reaction is feasible if AG is positive
   2. A reaction is feasible if AG is zero
   3. A reaction is feasible if AG is negative
   4. Can’t predict the feasibility of reaction from AG

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(b) Compare and contrast Extensive properties and Intensive properties. 04

(c) Compare and contrast Hess’ law and Kirchhoff’s law. 07

OR

(c) Explain reversible and irreversible processes. 07

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Q.3 (a) Explain Quasi-static process. 03

(b) Explain the temperature composition diagram for the binary alloy system. 04

(c) Define and explain the terms specific heat at constant pressure (Cp) and specific heat at constant volume (Cv) and derive the thermodynamics relationship between them. 07

OR

Q.3 (a) What are the objectives of thermodynamics and give applications of thermodynamics. 03

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(b) Write a short note on Sievert’s law. 04

(c) State & derive Maxwell’s equation from the combined statement of the first & second law. 07

Q.4 (a) State zeroth law of thermodynamics and give its importance. 03

(b) State & define the second law of thermodynamics & its significance. 04

(c) Explain the thermodynamic solution and differentiate between ideal and non-ideal solutions. 07

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OR

Q.4 (a) Write a short note on Van’t Hoff equation 03

(b) What is equilibrium? Explain different types of equilibrium. 04

(c) State & explain the Ellingham diagram for various metal oxides? 07

Q.5 (a) What are the functions of slag? 03

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(b) Explain the concept of basicity index. 04

(c) Briefly explain the thermodynamics of Slag — Metal reaction. 07

OR

Q.5 (a) Explain Phase, component & Degrees of Freedom? 03

(b) What is Gibb’s phase rule? Explain the importance of the phase rule. Derive Gibb’s phase rule 04

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(c) Explain Raoult’s law and Henry’s law. 07

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