GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
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Seat No.:
GUJARAT TECHNOLOGICAL UNIVERSITY
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SEMESTER- III (New) EXAMINATION — WINTER 2019
Subject Code: 3133507 Date: 28/11/2019
Subject Name: Basics of Unit Operations (BUO)
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 | (a) Define specific surface area, surface mean diameter and volume mean diameter for particles. | 03 |
|---|---|---|
| (b) Differentiate Jaw crusher and Gyratory crusher. | 04 | |
| (c) Explain the working and construction of a rotary drum filter with diagram. | 07 | |
| Q.2 | (a) Define various purposes of agitation. | 03 |
| (b) Derive method for calculation of power consumption for agitator | 04 | |
| (c) What will be the power required to crush 500 tons per hour of limestone if 80% of the feed passes 150 mm screen and 80% of the product a 2.125 mm screen? Work index of limestone is 12.74. | 07 | |
| OR | ||
| (c) Define agitation and mixing. Enlist different types of flow pattern induced in an Agitated vessel (liquid). | 07 | |
| Q.3 | (a) Explain the power requirement for a crushing mill by Rittinger’s power laws with expressions. | 03 |
| (b) Explain the working and construction of a ball' mill with a neat sketch. | 04 | |
| (c) Explain about Hydro cyclone | 07 | |
| OR | ||
| Q.3 | (a) Discuss about sink and float method: | 03 |
| (b) What are the uses of filter aid and- filter media? | 04 | |
| (c) Explain the principle, construction and working of a roll crusher with a neat sketch. | 07 | |
| Q.4 | (a) Differentiate clarifier and-classifier. | 03 |
| (b) Discuss pros and cons of filter press. | 04 | |
| (c) With the help of neat sketch explain different types of impellers for agitation of liquids along with application. | 07 | |
| OR | ||
| Q.4 | (a) What rotational speed in RPM would you recommend for a ball mill of 1200 mm in diameter charged with 75mm balls? | 03 |
| (b) Explain about critical speed of ball mill | 04 | |
| (c) Write short notes on “Scale up in agitator design” | 07 | |
| Q.5 | (a) Classify comminuting equipment. | 03 |
| (b) Discuss different laws used for size reduction. | 04 | |
| (c) Explain construction, working and applications of cyclone separator with diagram. | 07 | |
| OR | ||
| Q.5 | (a) Write short note on static mixers. | 03 |
| (b) Describe various methods for swirling prevention | 04 | |
| (c) Explain the working and construction of a jaw crusher with sketch | 07 |
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