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Gujarat Technological University

This document contains questions for an exam on Mechanical Operations. It covers topics like size reduction equipment, comminution laws, fluidization types, crushing calculations, screening, classification, mixing, conveying, agitation, and solid-liquid separation processes. The questions test understanding of key concepts in these areas and ability to apply principles to solve related problems. They require explanations of operating mechanisms, comparisons of different techniques, calculations involving process parameters, and more.

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40 views1 page

Gujarat Technological University

This document contains questions for an exam on Mechanical Operations. It covers topics like size reduction equipment, comminution laws, fluidization types, crushing calculations, screening, classification, mixing, conveying, agitation, and solid-liquid separation processes. The questions test understanding of key concepts in these areas and ability to apply principles to solve related problems. They require explanations of operating mechanisms, comparisons of different techniques, calculations involving process parameters, and more.

Uploaded by

Jay PATEL
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Seat No.: ________ Enrolment No.

___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER- V EXAMINATION-SUMMER 2023
Subject Code: 3150502 Date: 27/06/2023
Subject Name: Mechanical Operations
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.
4. Simple and non-programmable scientific calculators are allowed.
MARKS
Q.1 (a) Define (1) Mesh number (2) Angle of nip (3) Work index 03
(b) What the use is of filter aid and filter media? 04
(c) Explain the construction and working of trommels with the help of a neat sketch and enlist 07
various trommels arrangement.

Q.2 (a) Calculate the power required to crush 150 tonnes per hour of limestone if 80% of the feed passes 03
50mm screen and 80% of the product passes a 3.125mm screen? Work index of limestone =
12.74.
(b) Differentiate between open circuit and closed circuit operations. 04
(c) Write principle of comminution. Explain various laws of size reduction in detail. 07

OR
(c) Give classification of various size reduction equipments. 07

Q.3 (a) Give significance of Power no, Reynolds no and Froude no for mixing of liquids. 03
(b) Explain: “For efficient grinding, ball mills must be operated at a speed lessthan the 04
critical speed.”
(c) List different types of industrial conveyers and explain any one in detail. 07
OR
Q.3 (a) What are the various equipments used for storage of solids? Discuss any one. 03
(b) What rotational speed in RPM would you recommend for a ball mill 1100mm in diameter 04
charged with 70 mm balls?
(c) Explain in detail: Types of fluidization. 07

Q.4 (a) Define sphericity. Prove that sphericity of sphere is unity. 03


(b) Differentiate differential and cumulative analysis. 04
(c) A roller crusher has rolls of 200 cm in diameter and 75 cm face width. The crushing roll surfaces 07
are 1.25 cm apart at the narrowest point. The angle of nip 30°. The roll crusher operates at a
speed of 150 rpm. They are used to crush a rock of specific gravity of 2.35. Calculate the
maximum permissible size of feed and the maximum actual capacity in metric tons per hour, if
the actual capacity is 15 % of the theoretical.
OR
Q.4 (a) Give the difference between ideal screen and actual screen. 03
(b) Explain construction and working of the Dorr thickener 04
(c) What is the differential settling method? Explain in detail the working of batch 07
sedimentation with application.

Q.5 (a) Define: electrostatic separation. 03


(b) Discuss Sink and float method 04
(c) Discuss selection criteria of agitator. 07
OR
Q.5 (a) Differentiate between clarifier and classifiers 03
(b) Discuss different method for prevention of swirling and vortex formation in agitated tank. 04
(c) Explain construction and working of continuous rotary vacuum filter. 07

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