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Machine Design

Machine Design
Shear stress theory is applicable for

Elastic materials
All of these
Brittle materials
Ductile materials

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Machine Design
According to Indian standards, total numbers of tolerance grades are

20
12
18
8

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Machine Design
The centre distance between two meshing involute gears is equal to

Sum of base circle radii/cosφ
Sum of pitch circle radii/cosφ
Difference of base circle radii/cosφ
Difference of pitch circle radii/cosφ

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Machine Design
The included angle for the V-belt is usually

10°-20°
30°-40°
40°-60°
60°-80°

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Machine Design
The dedendum is the radial distance from the

Pitch circle to the bottom of a tooth
Pitch circle to the top of a tooth
Addendum circle to the clearance circle
Top of a tooth to the bottom of a tooth

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Machine Design
In designing a key, it is assumed that the distribution of forces along the length of key

Is uniform throughout
Varies exponentially, being less at the torque-input end
Varies exponentially, being more at the torque-input end
Varies linearly

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