GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Name: Mass Transfer Operation - II
Time: 02:30 PM TO 05:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019
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Subject Code: 2160501 Date: 04/12/2019Subject Name: Mass Transfer Operation - II
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARKS | |
| Q.1 | |
| (a) List assumptions of McCabe-Thiele method and its limitations. | 03 |
| (b) Write short note on adsorbents with their characteristics. Also state few industrial applications of adsorption. | 04 |
| (c) A mixture of 45 mol% Benzene and remaining Toluene is continuously fractioned in a tower. Feed is liquid at its boiling point and is introduced at 5 kmol/s rate. This gives 98 % benzene in distillate and 98 % toluene in bottoms. Find amount of Distillate and Bottoms. Find minimum reflux ratio and number of plates when total reflux is used. Equilibrium data in mole fraction is given as: | 07 |
| x | 1 | 0.78 | 0.58 | 0.4 | 0.26 | 0.13 | 0.017 |
| y | 1 | 0.9 | 0.78 | 0.63 | 0.49 | 0.26 | 0.039 |
| Q.2 | |
| (a) Explain constant pressure equilibria with neat sketch. | 03 |
| (b) With neat sketch, explain drum dryer. | 04 |
| (c) Carry out material balance for feed tray and derive equation for q line. How feed condition affects the q line? Draw and explain. | 07 |
| OR | |
| (c) Give detailed classification of cooling towers and discuss about any one in detail with neat sketch. | 07 |
| Q.3 | |
| (a) Briefly explain freeze drying. | 03 |
| (b) Discuss about various types of adsorption. | 04 |
| (c) Define saturated humidity, Humid heat and humid volume. A gas (B)-benzene (A) mixture is saturated at 1 std atm, 50 C. Calculate the absolute humidity if B is (a) nitrogen and (b) carbon dioxide. Vapor pressure of benzene at 50°C is given as 0.362 std atm. | 07 |
| OR | |
| Q.3 | |
| (a) Compare forced draft and induced draft cooling tower. | 03 |
| (b) Derive Rayleigh’s equation for simple distillation. | 04 |
| (c) Write Freundlich equation and explain. Write material balance for a single stage adsorption and apply Freundlich equation in it. | 07 |
| Q.4 | |
| (a) Define reflux ratio. Explain total and minimum reflux. How reflux ratio affects the number of stages. | 03 |
| (b) Discuss about the factors which affects the drying. How is drying different than evaporation? | 04 |
| (c) Explain Extractive distillation by citing proper example. Also write requirements of solvent to be used in distillation. | 07 |
| OR | |
| (b) Explain ideality and Raoult’s law. Also discuss about positive deviation. | 04 |
| (c) Derive equation for Adiabatic Saturation Curve. | 07 |
| Q.5 | |
| (a) Briefly explain adsorption hysteresis. | 03 |
| (b) Write brief note on Pressure Swing Adsorption (PSA). | 04 |
| (c) A commercial dryer requires 6 hr to dry the moist material from 32 % to 8 % moisture on wet basis. The critical moisture content is 16 % (wet) and equilibrium moisture content is 0.05 kg moisture/kg dry solid. How much excess time is required to dry material from 37 % to 7 %, if the drying conditions remains the same. | 07 |
| OR | |
| Q.5 | |
| (a) Discuss about range and approach with reference to cooling tower. | 03 |
| (b) Discuss the principle of Ion Exchange and its application. | 04 |
| (c) Derive equation for time required in constant and falling rate drying. | 07 |
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