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Machine Design

Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

More
Less
Same
None of these

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

4μ sinθ/(θ + sinθ)
μ sinθ/(2θ + sin 2θ)
4μ sinθ/(2θ + sin 2θ)
2μ sinθ/(θ + sinθ)

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Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

Double
One-third
One-half
One-fourth

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Machine Design
An alien bolt is

Same as stud
Used in high speed components
Provided with hexagonal depression in head
Self locking bolt

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kt - 1)/ (Kf - 1)
(Kf - 1)/ (Kt - 1)
(Kf + 1)/ (Kt + 1)
(Kt + 1)/ (Kf + 1)

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Machine Design
The arms of the pulleys for flat belt drive have

All the three characteristics
Major axis in plane of rotation
Major axis twice the minor axis
Elliptical cross-section

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