GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER - V(OLD)- EXAMINATION - WINTER 2017
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Subject Code: 152503 Date:08/11/17Subject Name: Design of M/c Elements - I
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define: 07
Stress concentration, Fatigue Failure, Endurance limit, Size factor, Notch sensitivity, Surface finish factor.
(b) A cantilever beam of cold drawn steel 40C8 (Su = 600 N/mm² and Sy = 380 07 N/mm²) is shown in fig below. The force P acting at the free end varies from -50 N to +150 N. the expected reliability is 90% and the factor of safety is 2. The notch sensitivity factor at the fillet is 0.9. Determine the diameter ‘d’ of the beam at the fillet cross section.
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