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Seat No.: Enrolment No.
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018
Subject Code:2150502 Date:11/12/2018
Subject Name:Mechanical Operation
Time: 10:30 AM TO 01:00 PM Total Marks: 70
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Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Classify comminuting equipment. 03
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(b) Differentiate between open circuit and closed circuit 04 operations.(c) Explain working of a smooth roll crusher. Define angle 07 of nip.
Q.2 (a) Discuss various mechanism of filtration in brief. 03
(b) Explain “Screen effectiveness and capacity are 04 opposing factors.”
(c) Define agitation and mixing. Enlist different types of 07 flow pattern induced in an Agitated vessel (liquid).
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OR
(c) Discuss various laws for crushing . 07
Q.3 (a) Discuss applications of ‘fluidization in chemical 03 industry.
(b) A pair of rolls is to take-a feed equivalent to spheres of 3 04 cm in diameter and.crush them to spheres having 1 cm diameter. If the'coefficient of friction is 0.29, what would be the diameter of rolls?
(c) Discuss mixers for pastes and plastic masses. 07
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OR
Q.3 (a) Differentiate clarifier and classifier. 03
(b) Classify the Filtration equipments with examples in each 04 category.
(c) Write a short note on rotary filters with neat diagram. 07
Q4 (a) Define: (i) angle of nip and (ii) mixing index.(iii) angle 03 of repose
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(b) In a ball mill of diameter 2000 mm, 100 mm dia. steel 04 balls are being used for grinding. Presently, for the material being ground, the mill is run at 15 rpm. At what speed will the mill have to be run if the 100 mm balls are replaced by 50 mm balls, all the other conditions remaining the same?(c) Explain in detail: Types of fluidization. 07
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OR
Q4 (a) Discuss the different criteria’s for selection of conveyers. 03
(b) Draw neat sketch of an agitated vessel and label the 04 important parts.
(c) An agitated baffle vessel is being used to prepare a 07 uniform solution of viscosity 2 cP, running the agitator at 100 rpm, so as to obtain a Reynolds number of 50,000. If the contents of the vessel are replaced by a solution of viscosity 4 cP, and the agitator rpm is increased to 200, by how much will the power requirement change?
Q.5 (a) Write short notes on slurry transport. 03
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(b) What is the use of filter aid and filter media? 04(c) What are the various methods for prevention of swirling 07 in an agitated vessel?
OR
Q.5 (a) What is power number and its significance? 03
(b) Explain : “For efficient grinding, ball mills must be 04 operated at a speed less than the critical speed.”
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(c) With the help of neat sketch explain different types of 07 impellers for agitation of liquids along with application.This download link is referred from the post: GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
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