Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 5th Sem New 2150502 Mechanical Operation Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2150502 Date: 20/06/2019
Subject Name:Mechanical Operation
Time: 02:30 PM TO 05:00 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) Define (1) Mesh number (2) Angle of nip (3) Work index 03
(b) Define sphericity. Find the sphericity of ideal cylinder. 04
(c) Write principle of comminution. Explain various laws of size reduction in
detail.
07
Q.2 (a) What rotational speed in RPM would you recommend for a ball mill of 1200
mm in diameter charged with 75mm balls?
03
(b) Derive the equation for screen effectiveness. 04
(c) Explain and differentiate open and closed circuit operation for size reduction
of solid with neat schematic diagram.
07
OR
(c) Give classification of size reduction equipments. 07
Q.3 (a) List various application of fluidization in chemical industry. 03
(b) A certain set of crushing rolls of 1000 mm diameter by 375 mm width of
face. They are set so that the crushing surfaces are 12 mm apart at the
narrowest point. The angle of nip is 30
o
. What is the maximum permissible
size of feed?
04
(c) Define critical speed of the ball mill. Explain in detail the construction and
working of the Ball mill with neat figure and the industrial application.
07
OR
Q.3 (a) Discuss the different criteria?s for selection of conveyers. 03
(b) What will be the power required to crush 150 tones per hour of limestone if
80% of the feed passes 2 inch screen and 80% of the product passes a 1/8
inch screen? Work index of limestone = 12.74.
04
(c) What is fluidization? Discuss the conditions for fluidization. 07
Q.4 (a) What are filter aids and filter media? 03
(b) With neat diagram explain about grizzlies. 04
(c) Explain in detail plate and frame filter press with its neat diagram and
advantages.
07
OR
Q.4 (a) Explain construction and working of the cyclone separator. 03
(b) Explain sink and float method. 04
(c) What is the differential settling method? Explain in detail the working of
batch sedimentation with application.
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? SUMMER 2019
Subject Code: 2150502 Date: 20/06/2019
Subject Name:Mechanical Operation
Time: 02:30 PM TO 05:00 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) Define (1) Mesh number (2) Angle of nip (3) Work index 03
(b) Define sphericity. Find the sphericity of ideal cylinder. 04
(c) Write principle of comminution. Explain various laws of size reduction in
detail.
07
Q.2 (a) What rotational speed in RPM would you recommend for a ball mill of 1200
mm in diameter charged with 75mm balls?
03
(b) Derive the equation for screen effectiveness. 04
(c) Explain and differentiate open and closed circuit operation for size reduction
of solid with neat schematic diagram.
07
OR
(c) Give classification of size reduction equipments. 07
Q.3 (a) List various application of fluidization in chemical industry. 03
(b) A certain set of crushing rolls of 1000 mm diameter by 375 mm width of
face. They are set so that the crushing surfaces are 12 mm apart at the
narrowest point. The angle of nip is 30
o
. What is the maximum permissible
size of feed?
04
(c) Define critical speed of the ball mill. Explain in detail the construction and
working of the Ball mill with neat figure and the industrial application.
07
OR
Q.3 (a) Discuss the different criteria?s for selection of conveyers. 03
(b) What will be the power required to crush 150 tones per hour of limestone if
80% of the feed passes 2 inch screen and 80% of the product passes a 1/8
inch screen? Work index of limestone = 12.74.
04
(c) What is fluidization? Discuss the conditions for fluidization. 07
Q.4 (a) What are filter aids and filter media? 03
(b) With neat diagram explain about grizzlies. 04
(c) Explain in detail plate and frame filter press with its neat diagram and
advantages.
07
OR
Q.4 (a) Explain construction and working of the cyclone separator. 03
(b) Explain sink and float method. 04
(c) What is the differential settling method? Explain in detail the working of
batch sedimentation with application.
07
2
Q.5 (a) Explain screw conveyer in brief with its industrial applications. 03
(b) Differentiate between clarifier and classifier along with their working
principle.
04
(c) Describe the different mixing equipments used for solid mixing in brief. 07
OR
Q.5 (a) What are the preventive measures for reducing swirling in agitated tanks? 03
(b) Explain method for calculation of power consumption for agitator. 04
(c) A silty soil containing 14% moisture was mixed in a large Muller mixer with
10.0 weight percent of a tracer consisting of dextrose and picric acid. After 3
minutes of mixing, 12 random samples were taken from the mix and
analyzed calorimetrically for tracer materials. The measured concentrations
in the samples were, in weight percent tracer, 10.24, 9.30, 7.94, 10.24, 11.08,
10.03, 11.91, 9.72, 9.20, 10.76, 10.97 and 10.55.Calculate the mixing index
07
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This post was last modified on 20 February 2020