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Machine Design 1: Design of Shaft | Keys | Coupling
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Machine Design 1: Design of Shaft | Keys | Coupling
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25 Questions

1. When the shaft is subjected to pure torsional moment, the torsional stress is given by?
2. The main advantage of sunk key is that it is a _____ drive.
3. The region of safety for biaxial stresses is of which shape in the case of maximum distortion energy theorem.
4. Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm². The diameter of shaft and width of key can be taken as 40mm and 10mm respectively.
5. Oldham coupling i used to connect two shafts having intersecting axes.
6. If yielding strength=400N/mm², the find the permissible shear stress according to ASME standards.
7. Among maximum shear stress theory and distortion energy theory, which gives the higher value shear yield strength?
8. According to ASME code, maximum allowable shear stress is taken as X% of yield strength or Y% of ultimate strength.
9. Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5’ and take G=79300N/mm².
10. The shaft is always stepped with ________ diameter at the middle portion and __________ diameter at the shaft ends.
11. In distortion energy theorem, if a unit cube is subjected to biaxial stress, then S(yt) is given by which of the following?
12. Counter shaft is a secondary shaft.
13. Flexible shafts have ___ rigidity in torsion making them flexible.
14. Involute splines have stub teeth with a pressure angle of ___
15. ______ is used for a shaft that supports rotating elements like wheels, drums or rope sleaves.
16. The strength of hollow shaft is more than the strength of solid shaft of same weight.
17. Flexible shafts have ______ rigidity in bending moment.
18. Is it necessary for an axle to be ______ with respect to rotating element?
19. Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned.
20. Distortion energy theorem is not recommended for ductile materials.
21. Shafts are subjected to ______ forces.
22. Axle is frequently used in torque transmission.
23. Splines are keys.
24. A coupling is a mechanical device that temporarily joins two rotating shafts to each other.
25. The stiffness of solid shaft is more than the stiffness of hollow shaft with same weight.

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