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Machine Design

Machine Design
Which is positive drive?

Timing belt
V belt drive
Crossed belt drive
Flat belt drive

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Machine Design
For a bevel gear having the pitch angle θ, the ratio of formative number of teeth (TE) to actual number of teeth (T) is

1/tanθ
1/sinθ
sinθ cosθ
1/cosθ

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

8F/ πd²
4F/ πd²
6F/ πd²
16F/ 3πd²

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Machine Design
The dedendum is the radial distance from the

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

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Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

W/A
3W/A
2W/A
W/2A

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

p.t.σt
(p - d) t.σt
p.d.σt

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