Download GTU BE/B.Tech 2018 Winter 4th Sem New 2142105 Heat And Mass Transfer In Metallurgy Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER-1V (NEW) EXAMINATION - WINTER 2018

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Subject Code: 2142105 Date: 01/12/2018

Subject Name: Heat and Mass Transfer in Metallurgy

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. (a) What is heat transfer? Why study of heat transfer is useful in metallurgical processes? 04
2. (b) State Newton’s Law of Viscosity and classifies fluid. 07
3. (c) What do you mean by mass transfer? Explain different modes of mass transfer. 03

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4. (a) Differentiate between free and force convection. 04
5. (b) State Fourier law of heat conduction and derive unit of conductivity. 07
6. (c) Derive general equation of heat conduction in rectangular coordinate system. 07
   OR
7. (a) Derive Hagen-Poiseulle equation for incompressible fluid flowing laminar through pipe. 04

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8. (b) If specific gravity of petrol is 0.65 than calculate its density and specific weight. 07
9. (c) State Fick’s laws of diffusion and define diffusivity. 03
10. (a) Derive differential momentum balance equation. 04
    OR
11. (b) How radiative heat transfer is different than conduction and convection? 07

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12. (c) Water is flowing with velocity 3 m/s in 30 cm diameter pipe which branches into two pipe of diameter 25 cm and 15 cm. Velocity of water in 25 cm diameter pipe is 2.5 m/s. Calculate Discharge in all three pipe and velocity in 15 cm diameter pipe. 03
13. (a) Derive relation for heat transfer between two bodies by radiation. 04
14. (b) Density of iron is 7.8 g/cc. Calculate its specific weight. 07
15. (c) Briefly explain kirkindal effect. 03
16. (a) Derive equation of viscosity measurement by stoke’ method. 04
    

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    OR
17. (b) Explain plank law for radiation. 07
18. (c) Explain Emissivity, Emissive power, gray body and white body. 03
19. (a) Derive generalized mass diffusion equation. 04
20. (b) What is dimensionless analysis? 07

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21. (c) Explain pseudo steady diffusion. 03
22. (a) Explain in terms of Radiation: absorptivity, reflectivity, emissivity and transmissivity. 04
    OR
23. (b) Briefly explain laws of diffusion. 07
24. (c) Give correlations of dimensionless numbers which play important role in natural & forced convections. 03

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25. (a) Derive Bernoulli's equation by using Euler’s equation. 04