Q. In watches and gramophones, which spring is most commonly used (Solved)
1. Flat spiral spring
2. torsion helical spring
3. conical helical spring
4. none of the above
5. Cast steel
- a. Flat spiral spring
1. Flat spiral spring
2. torsion helical spring
3. conical helical spring
4. none of the above
5. Cast steel