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

Belleville spring
Torsion spring
Helical compression spring
Spiral spring

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Machine Design
A bolt of M 24 × 2 means that

The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
The pitch of the thread is 24 mm and depth is 2 mm
Cross-sectional area of the threads is 24 mm²

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Machine Design
An open belt drive is used when

Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the same directions
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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Machine Design
In hydrostatic bearings

Grease is used for lubrication
The Oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant

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