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Machine Design

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

All of these
Compression
Tension
Shear

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Machine Design
The dynamic tooth load is due to

Inaccuracies of tooth spacing
Deflections of teeth under load
All of these
Irregularities in tooth profiles

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Machine Design
The suitable material for belt used in flour mill is

Canvas or cotton duck
Rubber
Leather
Balata gum

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Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

Double
One-fourth
One-third
One-half

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd⁴/ 8D²n
Gd⁴/ 8D3n
Gd3/ 8D3n
Gd⁴/ 4D3n

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Machine Design
The draw of cotter should not be more than

12 mm
8 mm
6 mm
3 mm

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