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APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SEVENTH SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019

Course Code: ME401
Course Name: DESIGN OF MACHINE ELEMENTS - I

Max. Marks: 100 Duration: 3 Hours
Use of approved design data book is permitted
PARTA
Answer any two full questions, each carries 15 marks. Marks
Explain the steps involved in the design process. (2)
What is factor of safety? What are the factors affecting factor of safety? (4)
What are the endurance strength modification factors? (3)

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Explain the effect of stress concentration on ductile and brittle materials மாமனா... (6)
static and variable loading.
Explain impact factor. (2)
A 50 mm diameter steel shaft with a 20 mm transverse hole is simultaneously (13)
subjected to a bending stress which varies from + 100 MPa to — 70 MPa. and a
torsional stress which varies from + 80 MPa to -50 MPa. Find the factor of
safety for infinite life assuming the following properties. Ultimate strength in
tension 800MPa, Yield strength 550MPa. Surface correction factor = 0.85, size
factor =0.85 and Notch sensitivity factor = 0.9. Use maximum distortion energy
theory.
How will you design a component made of steel subjected to variable load fora (4)
finite life?
A carbon steel rod of circular cross section is subjected to a bending moment (11)
which varies from 300 Nm to 500 Nm and an axial load which varies from 6
KN to 9 KN .Determine the diameter of the rod for a factor of safety of 3.Take
605 600 MPa, ൭5400 MPa
PART ‏تا‎

Answer any two full questions, each carries 15 marks.
What is the tensile stress area of screw thread? (2)
Determine the safe tensile load for M12,M20 and M30 coarse grade bolts, (3)
assuming a safe tensile stress of 43 MPa.

A plate as shown in figure below is subjected to an eccentric force (P) of 15 KN (10)

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