Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem Old 131902 Machine Design And Industrial Drafting Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2018
Subject Code:131902 Date:28/11/2018
Subject Name:Machine Design & Industrial Drafting
Time:10:30 AM TO 01:30 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)
Classify the different types of load & Explain each In brief.
04
(b)
Differentiate between (with neat sketch):
1) Crushing and Compressive stresses
2) Torsional and Transverse shear stress
04
(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
Q.2 (a)
Classify the different types of riveted joints? Explain the terms with the sketches- Pitch,
Margin, Transverse pitch, Diagonal pitch. Show by neat sketches the various failure of
rivet joint.
07
(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.
The rods and pin are made of plain carbon steel 30C8. The permissible stresses
are ?t = ?c = 80 MPa and ? = 40MPa
07
Q.3 (a) Draw a neat sketch of a protected type flange coupling and write the design
procedure with the design equation for different failure criteria.
07
(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
Differentiate between simple and compound lever.
07
(b)
What is keyway? How is its effect considered in shaft design? Derive strength equations
of sunk key based on shear and compression failures.
07
Q.4 (a)
Compare the weight, strength and rigidity of a hollow shaft of same external diameter as
that of solid shaft. Both the shafts are made of same material. Assume that the diameter
ratio for the hollow shaft as 0.6.
07
(b)
Attempt the following (i) What do you understand by self-locking and overhauling of
screw? (ii) Show that the efficiency of self-locking screws is less than 50 %
07
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
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.
07
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
the recommended tolerance grade
07
OR
Q.5 (a)
Explain following AutoCAD command: (1) Offsetting (2) Trimming (3) Chamfering (4)
Rectangle (5) Ellipse (6) Arc (7) Polygon
07
(b)
What is fit? Explain different types of fits with applications.
07
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This post was last modified on 20 February 2020