Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3152911 Theory Of Textile Machines Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3152911 Date:22/01/2021
Subject Name:Theory of Textile Machines
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1 (a) State advantages of V belt drives.
03
(b) Give classification gear. Also state advantages of gear drive.
04
(c) Discuss different types of belts used in textile industries. Explain the effect
07
of slip on velocity ratio.
Q.2 (a) Define the term for gear profile (i) Pitch circle (ii) Circular pitch, and (iii)
03
addendum
(b) Derive the velocity ratio for open belt drive.
04
(c) What is gear train? Describe various types of gear trains with clear diagram.
07
Q.3 (a) What is the basic difference between clutch and brake?
03
(b) Describe working of a band and block brake with clear diagram.
04
(c) What is cam? Discuss the various types of motion that can be transmitted
07
with a cam and follower combination.
Q.4 (a) Suggest some lubrication processes to improve bearing life.
03
(b) Classify ball and roller bearings and mention the uses of each in textile.
04
(c) List out type of clutch. Explain cone clutch with clear diagram.
07
Q.5 (a) Define tern work done and power.
03
(b) Explain linear displacement and angular displacement with suitable
04
example.
(c) Defined coefficient of friction. Explain Static friction and Dynamic friction.
07
Also state laws of solid friction.
Q.6 (a) Define term: acceleration and retardation.
03
(b) Derived the relation between force, time and momentum.
04
(c) What is use of differential gear in speed frame? Describe the differential
07
gear use in a speed frame with neat sketch.
Q.7 (a) What is centre of gravity? State importance of centre of gravity in textile.
03
(b) What are the reasons for excessive vibration in textile machines?
04
(c) For crank beat up mechanism, derive an expression for displacement of sley
07
(s) in terms of length of crank (r), connecting arm length (l) and crank angle
().
Q.8 (a) What is roller eccentricity and roller vibration in drafting?
03
(b) Explain the working of the differential gear train in a speed frame.
04
(c) Draw shedding tappet for plain weave considering following particulars:
07
Lift of tappet = 4 inch
1
Distance from the centre of driving shaft to the nearest point of contact with
the treadle bowl = 2 inch
Dwell of tappet = 1/3 of pick
Diameter of treadle bowl = 2 inch
Also Write down the step followed to draw the shedding tappet.
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This post was last modified on 04 March 2021