UNIT-1 1. Derive the expression of beam strength of a spur gear tooth. 2. Derive the expression for efficiency of worm wheel drive. 3. What is virtual or formative gear? 4. Describe the law of gearing. Why involute teeth are preferred over cycloidal teeth? What is the reason of interference in gears and how it can be avoided? 5. Using a suitable schematic diagram explain the forces acting on worm gears. Also, define normal pitch, helix angle and efficiency of worm gear drive. 6. Briefly discuss the following: (i) System of gear teeth (ii) Pressure angle 7. Discuss the classification of helical gears. With a neat sketch explain the forces acting on a helical gear and explain. 8. With the help of a sketch, explain how an axial thrus...
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