Subject Code: 131902
GUJARAT TECHNOLOGICAL UNIVERSITY
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BE - SEMESTER-III (OLD) EXAMINATION — WINTER 2018
Date: 28/11/2018
Subject Name: Machine Design & Industrial Drafting
Time: 10:30 AM TO 01:30 PM
Instructions:
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- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Total Marks: 70
Q.1 (a) Classify the different types of load & Explain each In brief. 04
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(b) Differentiate between (with neat sketch): 04
- Crushing and Compressive stresses
- Torsional and Transverse shear stress
(c) Define factor of safety and state the important factors affecting the factor of safety 03
(d) State the difference between shaft, axle and spindle. 03
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Q.2 (a) Classify the different types of riveted joints? Explain the terms with the sketches- Pitch, 07 Margin, Transverse pitch, Diagonal pitch. Show by neat sketches the various failure of rivet joint.
(b) Explain the design process for socket and spigot cotter join 07
OR
(b) Design a knuckle joint to connect two rods subjected to tensile force of 50 KN. 07 The rods and pin are made of plain carbon steel 30C8. The permissible stresses are 6= 6. = 80 MPa and t = 40MPa
Q.3 (a) Draw a neat sketch of a protected type flange coupling and write the design 07 procedure with the design equation for different failure criteria.
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(b) Briefly explain general procedure for lever design with necessary cross section. 07
OR
Q.3 (a) Define following: (1) Arm of lever, (2) Leverage, (3) Displacement ratio and 07 Differentiate between simple and compound lever.
(b) What is keyway? How is its effect considered in shaft design? Derive strength equations (07 of sunk key based on shear and compression failures.
Q.4 (a) Compare the weight, strength-and rigidity of a hollow shaft of same external diameter as 07 that of solid shaft. Both the shafts are made of same material. Assume that the diameter ratio for the hollow shaft as 0.6.
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(b) Attempt the following (i) What do you understand by self-locking and overhauling of (07 screw? (i1) Show that the efficiency of self-locking screws is less than 50 %
OR
Q.4 (a) Derive an equation for torque required to raise (lift) load by square threaded screw. 07
(b) Find the diameter of a solid steel shaft to transmit 20 kW at 200 r.p.m. The ultimate shear 07 stress for the steel may be taken as 360 MPa and a factor of safety as 8.
If a hollow shaft is to be used in place of the solid shaft, find the inside and outside diameter considering the ratio of inside to outside diameters as 0.5.
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Q.5 (a) Classify and explain the types of welded joints with neat sketches and weld symbols 07
(b) What is magnitude of tolerance? Give the list of 6 manufacturing methods along with 07 the recommended tolerance grade
OR
Q.5 (a) Explain following AutoCAD command: (1) Offsetting (2) Trimming (3) Chamfering (4) 07 Rectangle (5) Ellipse (6) Arc (7) Polygon
(b) What is fit? Explain different types of fits with applications. 07
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