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Machine Design

Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

Compression
Tension
Shear
All of these

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Machine Design
The process extensively used for making bolts and nuts is

Extrusion
Hot piercing
Cold heading
Cold peening

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Machine Design
The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.

Heavier
Lighter
None of these
Moderate

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

More than 50%
Less than 50%
None of these
Equal to 50%

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

45° + φ/2
45° - φ/2
90° - φ
45° - φ

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

4 τ
2 τ
τ
τ/2

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