Machine Design
Which of the following spring is used in mechanical wrist watch?

Torsion spring
Belleville spring
Spiral spring
Helical compression spring

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Machine Design
A compound belt drive is used when

Shafts are arranged parallel and rotate in the same directions
None of these
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions

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