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Machine Design

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

Canvas or cotton duck
Balata gum
Rubber
Leather

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Machine Design
The face angle of a bevel gear is equal to

Pitch angle + dedendum angle
Pitch angle - dedendum angle
Pitch angle + addendum angle
Pitch angle - addendum angle

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Machine Design
When two springs are in series (having stiffness K), the equivalent stiffness will be

K/4
K/2
K
2K

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Machine Design
Resilience of a material is important, when it is subjected to

Shock loading
Fatigue
Combined loading
Thermal stresses

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Machine Design
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

Soderberg relation
None of these
Gerber relation
Goodman relation

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Machine Design
The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where φ = Angle of friction)

90° - φ
45° + φ/2
45° - φ
45° - φ/2

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