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GATE Previous Year Questions: Gear Terminology, Machine Design Video Lecture - Mechanical Engineering

FAQs on GATE Previous Year Questions: Gear Terminology, Machine Design Video Lecture - Mechanical Engineering

1. What are some commonly used gear terminologies in machine design?
Ans. Some commonly used gear terminologies in machine design include pitch circle, addendum, dedendum, backlash, pressure angle, and module. The pitch circle is an imaginary circle that represents the theoretical point of contact between two gears. Addendum is the radial distance between the pitch circle and the top of the gear tooth. Dedendum is the radial distance between the pitch circle and the bottom of the gear tooth. Backlash is the clearance between mating gear teeth when they are not in contact. Pressure angle is the angle between the line of action and a line tangent to the pitch circle. Module is the ratio of the pitch circle diameter to the number of teeth on the gear.
2. What is the purpose of gear terminology in machine design?
Ans. Gear terminology is essential in machine design as it helps in accurately defining and specifying the dimensions, profiles, and positioning of gears. By using specific gear terminologies, engineers and designers can communicate effectively and ensure the proper functioning of gear systems. It allows for a standardized approach to gear design and manufacturing, ensuring compatibility and interchangeability of gears in different machines and systems.
3. How does the pressure angle affect gear design?
Ans. The pressure angle is a crucial parameter in gear design as it determines the efficiency, load-carrying capacity, and smoothness of gear operation. A smaller pressure angle results in a higher load-carrying capacity and better power transmission efficiency. However, it also leads to higher stresses and increased wear. On the other hand, a larger pressure angle reduces the load-carrying capacity and efficiency but provides smoother operation and less wear. The choice of pressure angle depends on the specific application and the trade-offs between these factors.
4. What is the significance of backlash in gear systems?
Ans. Backlash is the clearance between mating gear teeth when they are not in contact. It is an important consideration in gear design as it affects the accuracy, precision, and smoothness of gear operation. A minimal amount of backlash is necessary to prevent interference and ensure proper engagement of gear teeth. However, excessive backlash can lead to play, vibration, noise, and reduced positioning accuracy. Designers need to carefully consider the required amount of backlash based on the specific application and the desired balance between smoothness and precision.
5. What is the purpose of module in gear design?
Ans. Module is a gear terminology that represents the ratio of the pitch circle diameter to the number of teeth on the gear. It is a critical parameter in gear design as it determines the size, strength, and performance characteristics of gears. By specifying a particular module, designers can ensure compatibility and interchangeability of gears within a system. It allows for standardized gear production, as gears with the same module can be manufactured using standardized cutting tools and processes. The choice of module depends on factors such as load requirements, available space, and manufacturing capabilities.
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