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Machine Design

Machine Design
The radial distance of a tooth from the pitch circle to the top of the tooth is called

Addendum
Dedendum
Working depth
Clearance

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Machine Design
The taper on cotter varies from

1 in 48 to 1 in 24
1 in 15 to 1 in 10
1 in 32 to 1 in 24
1 in 24 to 1 in 20

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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

τ
τ/2
2 τ
4 τ

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Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

24
14
12
18

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Machine Design
A screw is said to be over hauling screw, if the

Friction angle is more than helix angle
Efficiency of screw is 100%
Friction angle is less than helix angle
Friction angle is equal to helix angle

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Machine Design
The strength of the unriveted plate (P) per pitch length is equal to

(p - d) t.σt
p.t.σt
(p - d) σt
p.d.σt

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