Question Paper: Design of Machine Elements 1 : Question Paper Dec 2014 - Mechanical Engineering (Semester 5) | Visveswaraya Technological University (VTU)
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## Design of Machine Elements 1 - Dec 2014

### Mechanical Engg. (Semester 5)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
1 (a) A 50 mm steel rod supports a 9 kN load and in addition to this a torsional moment of 100 N-m is applied on it as shown in Fig.Q1(a). Determine the maximum tensile and Maximum shear stresses. (10 marks) 1 (b) Briefly discuss three dimensional stress field and stress tensor.(10 marks) 2 (a) A mild steel shaft of 60 mm diameter is subject to bending coefficient of 25× 105 N-mm and torque Mt. If the yield stress in tension is 300 N/mm2, find the maximum value of torque without causing yielding of the shaft according to
i) Maximum shear stress theory of failure and ii) Maximum distortion theory of failure.
Adopt a factor of safely of 1.5
(10 marks)