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

Helical compression spring
Torsion spring
Spiral spring
Belleville spring

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Machine Design
Cap screws are

Used to prevent relative motion between parts
Provided with detachable caps
Slotted for a screw driver and generally used with a nut
Similar to small size tap bolts except that a greater variety of shapes of heads are available

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