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Machine Design

Machine Design
The material used for brake lining should have __________ coefficient of friction.

None of these
Moderate
High
Low

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Machine Design
Maximum principal stress theory is applicable for

Ductile materials
Brittle materials
Elastic materials
All of these

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Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

6/ (6 + v)
0.75/ (0.75 + √v)
4.5/ (4.5 + v)
3/ (3 + v)

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Machine Design
A key made from a cylindrical disc having segmental cross-section, is known as

Woodruff key
Flat saddle key
Feather key
Gib head key

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Machine Design
The groove angle of pulleys for V-belt is

300 to 320
420 to 450
340 to 360
More than 400

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Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A combination of bending stress and direct shear stress
Bending stress only
A combination of torsional shear stress and bending
Direct shear stress only

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