Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 5th Sem New 2150502 Mechanical Operation Previous Question Paper
Seat No.: ________ Enrolment No.___________
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
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
(b) Differentiate between open circuit and closed circuit
operations.
04
(c) Explain working of a smooth roll crusher. Define angle
of nip.
07
Q.2 (a) Discuss various mechanism of filtration in brief.
03
(b) Explain ?Screen effectiveness and capacity are
opposing factors.?
04
(c) Define agitation and mixing. Enlist different types of
flow pattern induced in an Agitated vessel (liquid).
07
OR
(c) Discuss various laws for crushing . 07
Q.3 (a) Discuss applications of fluidization in chemical
industry.
03
(b)
A pair of rolls is to take a feed equivalent to spheres of 3
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?
04
(c) Discuss mixers for pastes and plastic masses. 07
OR
Q.3 (a) Differentiate clarifier and classifier. 03
(b) Classify the Filtration equipments with examples in each
category.
04
(c) Write a short note on rotary filters with neat diagram. 07
Q.4 (a) Define: (i) angle of nip and (ii) mixing index.(iii) angle
of repose
03
(b) In a ball mill of diameter 2000 mm, 100 mm dia. steel
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?
04
(c) Explain in detail: Types of fluidization. 07
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Seat No.: ________ Enrolment No.___________
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
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
(b) Differentiate between open circuit and closed circuit
operations.
04
(c) Explain working of a smooth roll crusher. Define angle
of nip.
07
Q.2 (a) Discuss various mechanism of filtration in brief.
03
(b) Explain ?Screen effectiveness and capacity are
opposing factors.?
04
(c) Define agitation and mixing. Enlist different types of
flow pattern induced in an Agitated vessel (liquid).
07
OR
(c) Discuss various laws for crushing . 07
Q.3 (a) Discuss applications of fluidization in chemical
industry.
03
(b)
A pair of rolls is to take a feed equivalent to spheres of 3
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?
04
(c) Discuss mixers for pastes and plastic masses. 07
OR
Q.3 (a) Differentiate clarifier and classifier. 03
(b) Classify the Filtration equipments with examples in each
category.
04
(c) Write a short note on rotary filters with neat diagram. 07
Q.4 (a) Define: (i) angle of nip and (ii) mixing index.(iii) angle
of repose
03
(b) In a ball mill of diameter 2000 mm, 100 mm dia. steel
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?
04
(c) Explain in detail: Types of fluidization. 07
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OR
Q.4 (a) Discuss the different criteria?s for selection of conveyers. 03
(b) Draw neat sketch of an agitated vessel and label the
important parts.
04
(c)
An agitated baffle vessel is being used to prepare a
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?
07
Q.5 (a) Write short notes on slurry transport. 03
(b) What is the use of filter aid and filter media? 04
(c)
What are the various methods for prevention of swirling
in an agitated vessel?
07
OR
Q.5 (a) What is power number and its significance? 03
(b)
(c)
Explain : ?For efficient grinding, ball mills must be
operated at a speed less than the critical speed.?
04
With the help of neat sketch explain different types of
impellers for agitation of liquids along with application.
**************
07
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This post was last modified on 20 February 2020