B.TECH - Semester 7 design of machine elements 2 Question Paper 2020 (sep)
Practice authentic previous year university questions for better exam preparation.
Sample Questions
- 705 DESIGN OF MACHINE ELEMENTS II (M) Time : 3 HoursMax. Marks : 100 > Design Data hand book permitted. > Assume missing data suitably. Answer all questions. Each question carries 4 marks.
- Derive an expression for beam strength of a gear tooth.
- Explain the mode of failure in worm gearing.
- Differentiate between hydrodynamic lubrication and squeeze film lubrication.
- Explain the considerations given in the design of pistons for IC engines.
- Compare the stress distribution in thin and thick walled pressure vessels. $$ (5 \times 4=20 \text { Marks }) $$ PART - B Answer any one full question from each module. Each questions carries 20 marks.
- Design a $20^{\circ}$ involute worm gear for transmitting 11.25 kW . The center distance between worm and worm wheel shafts is 0.25 m and the speed reduction is $10.5: 1$. The worm shaft is rotating at 1200 rpm . (20)
- Design a bevel gear drive between two shafts whose axes are at right angles Speed of pinion shaft is $240 \mathrm{rev} / \mathrm{min}$ and that of the gear shaft is $120 \mathrm{rev} / \mathrm{min}$. Pinion is to have 21 teeth of involute profile wit...
- Design a journal bearing for a centrifugal pump running at 1440 rpm . Diameter of the journal is 10 cm and the load on each bearing is 2000 kg . Also calculate the minimum oil film thickness.
- A single-row deep groove ball bearing is subjected to a radial force of 8 kN and a thrust force of 3 kN . The shaft rotates at 1200 rpm . The expected life $L_{10 \mathrm{~h}}$ of the bearing is 20000 hours. The minimum acceptable diameter of the sha...
- Design a center crank shaft for a single cylinder vertical engine using the following data: | Cylinder bore | $=125 \mathrm{~mm}$ | | :--- | :--- | | $\mathrm{I} / \mathrm{r}$ ratio | $=4.5$ | | Maximum gas pressure | $=2.5 \mathrm{MPa}$ | | Stroke ...
- Design an aluminium alloy piston for single acting four stroke engine from the following data : | Piston diameter | $=90 \mathrm{~mm}$ | | :--- | :--- | | Speed | $=1500 \mathrm{rev} / \mathrm{min}$ | | Length of stroke | $=99 \mathrm{~mm}$ | | Mean...
- Design a centrifugal clutch for a belt drive from a shunt wound dc motor. The clutch is to be incorporated in the motor pulley and full spring control is required. The following data are specified. | Power $(25 \%$ over load to be allowed $)$ | $=15...
- (a) A thick walled closed end cylinder has internal and external diameters as 200 mm and 800 mm . The cylinder is subjected to an internal fluid pressure of 150 MPa . If $\mathrm{E}=72 \mathrm{GPa}$ and $\mu=033$, determine the principal stresses and...
- (b) Derive the expression for power lost in friction in a conical pivot.