10000ME401122002 Pages: 3

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Regular and Supplementary Examination December 2021 (2015 scheme)

Max. Marks: 100

b)
௦)

b)

b)

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

(i) Use of approved design data book is permitted
(ii) Missing data if any may be suitably assumed
PART A
Answer any two full questions, each carries 15 marks.
Distinguish between codes and standards.
What is the significance of preferred numbers?

Determine the thickness (t) of the steel bracket loaded as shown in Fig. 1 (dimensions

in mm) taking allowable normal stress as 90 MPa.

120
111183

(Fig. 1)

Explain the theories of failure: 1) Maximum normal stress theory and ii) Haigh’s
theory

A mild steel shaft having yield stress as 230 MPa is subjected to the following
stresses: 0, = 120 MPa, ©}, = —60 MPaand ‏پیر‎ = 36 MPa. Find the factor of safety
using von Mise’s theory of failure and Guest’s theory of failure.

A beam of square section (70 mm x 70 mm) is simply supported over a span of 250
mm. If a mass of 50 kg is dropped from a height of 25 mm onto the beam, determine
the impact (shock) factor.

A shaft stepped down from 60 mm to 40 mm diameter, as shown in Fig. 2, with a
fillet radius of 8 mm rotates at 2000 rpm. Find the safe power that can be transmitted

by this shaft limiting the shear stress to 60 MPa due to torque M;. Take stress

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Duration: 3 Hours

Marks
(3)
(3)
(9)

(5)

(10)

(5)

(10)