GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
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Seat No.:
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Subject Code:3152911
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-V (NEW) EXAMINATION — WINTER 2020
Subject Name:Theory of Textile Machines
Date:22/01/2021
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Time:10:30 AM TO 12:30 PM
Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| 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 of slip on velocity ratio. | 07 | |
| Q.2 | (a) Define the term for gear profile (i) Pitch circle (ii) Circular pitch, and (iii) addendum | 03 |
| (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 with a cam and follower combination. | 07 | |
| 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 term work done and power. | 03 |
| (b) Explain linear displacement and angular displacement with suitable example. | 04 | |
| (c) Defined coefficient of friction. Explain Static friction and Dynamic friction. Also state laws of solid friction. | 07 | |
| 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 gear use in a speed frame with neat sketch. | 07 | |
| 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 (s) in terms of length of crank (r), connecting arm length (l) and crank angle (?). | 07 | |
| 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: Lift of tappet = 4 inch Distance from the centre of 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. | 07 |
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