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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER-III EXAMINATION WINTER 2018
Subject Code:X31903 Date: 28/11/2018
Subject Name: Machine Design Industrial Drafting
Time: 10:30 AM TO 01:00 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

What is a stress concentration? Explain various stress relieving methods.
07

Explain following with figure. 1. Bearing stress. 2. Crushing stress.
07
Q.2

Explain general procedure of machine design.
07

Write the design procedure for spigot socket cotter joint.
07
OR

What is keys and write its classification.
07
Q.3

Explain the failure of a riveted joint with neat sketch.
07

What is factor of safety? Describe various factors influencing the value of factor of safety.
07
OR
Q.3

Explain the design of sleeve and cotter joint with neat sketch.
07

Explain: hollow shaft has greater strength and stiffness than solid shaft of equal weight'.
07
Q.4

Explain various types of power screw threads with its advantages and limitations with sketch.
07

Why are square threads preferable to V threads for power transmission? How does the helix angle influence on the efficiency of square threaded screw?
07
OR
Q.4

Explain the types of riveted joints.
07

Explain Oldham Coupling with the help of neat sketch.
07
Q.5

What is fit? State different types of fits with example.
07

Explain following AutoCAD command with example.
Mirror, Trim, Offset, Extend.
07
OR
Q.5

List 2D commands of editing the object in AUTOCAD.
07

List and explain the various co-ordinate systems in AutoCAD
07