B.TECH - Semester 6 design of machine elements Question Paper 2021 (dec)
Practice authentic previous year university questions for better exam preparation.
- Explain the different steps in design process.
- Approved design data handbook permitted.
- Assume missing data, if any suitably.
- Answer all questions from Part A and one full question from each module, from Part B.
- Write short notes on maximum shear stress theory.
- Explain with sketch tolerance, clearance, interference and clearance fit.
- What is meant by Hole basis system and shaft basis system? Which one is preferred and why?
- Why usual notations, obtain a relation for maximum load on the bolt, on a bolted joint under tension.
- What factors are to be considered before selecting the type of welded joint?
- Give stress in a welded butt joint subjected to axial load. ``` P.T.O. ```
- What are the various types of ends for helical compression spring.
- Explain design of shafts on the basis of rigidity.
- Explain the procedure for leaf spring design. ( $10 \times 4=40$ Marks) PART - B
- A steel alloy has an ultimate tensile strength of $615 \mathrm{MN} / \mathrm{m}^{2}$, a yield strength of $410 \mathrm{MN} / \mathrm{m}^{2}$ and an endurance limit of $205 \mathrm{MN} / \mathrm{m}^{2}$ under reversed bending. Sketch a modified Goodmass diagram. Indicate on the sketch and give the ma...
- A machine part of 16 mm diameter is made of alloy steel. It is subjected to a bending moment of 100 Nm , a torque of 50 Nm and an axial pull of 5 KN . Estimate the factor of safety based on maximum normal stress, maximum shear stress and maximum distortion energy theories. Assume yield tensile stren...
- A turn buckle is used to tighten a wire rope. The threads are single right and left hand and square in section. The outside diameter of the screw is 38 mm and the pitch is 8.5 mm . The coefficient of friction between the screws and nuts is 0.15 . What torque on the turn buckle is necessary if the ro...
- Design a muff coupling which is used to connect two steel shafts transmitting 40 kW at 350 rpm . The material for the shaft and key is plain carbon steel for which allowable shear stress and crushing stress may be taken as $40 \mathrm{~N} / \mathrm{mm}^{2}$ and $80 \mathrm{~N} / \mathrm{mm}^{2}$ res...
- Find the diameter of solid shaft to transmit 20 kW at 200 rpm . The ultimate shear stress for the steel may be taken as 360 Mpa and a factor of safety as 8 . If a hollow shaft is to be used in place of solid shaft, find the inside and outside diameter when the ratio of inside to outside diameters is...
- A truck spring has 12 leaves, two of which are full length leaves. The spring supports are 1.05 m apart and the central band is 85 mm wide. The central load is to be 5.4 kN with a permissible stress of $280 \mathrm{~N} / \mathrm{mm}^{2}$. Determine the thickness and width of the steel spring leaves....
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