Mechanical Engineering Questions

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1. What are the differences between true stress, engineering stress, proof stress.
2. What do you men by factor of safety and what is its significance
3. What do you mean by Young’s modulus, modulus of rigidity and bulk modulus.
4. What do you mean by resilience.
5. What is pure torsion and what do you mean by flexural igidity.
6. What is the difference between endurance limit stree and endurance strength.
7. What do you understand by efficiency of riveted joint.
8. What is caulking and fullering in riveted joint.
9. What do you mean by stress conc. Factor and what are the methods to reduce stress conc.
10. Why stress conc. Is more serious in brittle materials. 11. What do you mean by fatigue .
12. Springs are subjected to which type of streses.
13. What are the difference between through bolt, tap bolt and stud.
14. What is check nut and what is the function of washer.
15. Cotter and knuckle joints take which type of load and where they are used.
16. What are the difference types of couplings and what is their function.
17. What is the function of key and which type of stress they are subjected to?
18. Generally shafts are subjected to which type of stress.
19. What are the difference types of mechanical drives and which is the best for different situations.
20. What is the function of a bush why it is phosphor bronze.
21. What are difference types of threads and which threads are used for power transmission and why.
22. Why the pulley arms are elliptical in cross section and it is made up of cast iron.
23. Why it is required to change the all V belt if one of them is broken.
24. Why V belts transmit more power than flat belts.
25. What is the meaning of 6*37 or 6*7 in a rope drive.
26. What do you mean by pinion sprocket and wheel sprocket and which one is used for driving shaft.
27. What is the function of flywheel and why its material is cast iron.
28. Why the leaf springs are laminated as reducing length.
29. What is the function of clutch and is the difference between uniform wear and uniform pressure.
30. Now a days which type of clutches are used in automobiles. 31. Why disc brake is more efficient than mechanical brake.
32. What is the function of bearings and what are the different types.
33. What is bearing characteristics number and bearing modulus.
34. What is the significance of the digits of a rolling contact bearing number 6304?
35. Which type of gear drive is used for perpendicular transmission of power?
36. Why helical gears transmit more power than spur gears.
37. What do you mean by different terms like back lash, pressure angle, circular pitch in a gear drive.
38. Why involute tooth profile is better than cycloid tooth profile?
39. What is interference in gear drive and how to avoid it?
40. What do you mean by law of gearing