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Machine Design

Machine Design
Ball bearing type screws are found in following application

Steering mechanism
Crane
Screw jack
Aeroplane engines

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Machine Design
Factor of safety for fatigue loading is the ratio of

Young's modulus to the ultimate tensile strength
Elastic limit to the working stress
Elastic limit to the yield point
Endurance limit to the working stress

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Machine Design
The bearings of heavy series have capacity __________ over the medium series.

10 to 20%
40 to 50%
30 to 40%
20 to 30%

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Machine Design
A key made from a cylindrical disc having segmental cross-section, is known as

Flat saddle key
Woodruff key
Gib head key
Feather key

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

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

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Machine Design
A locking device extensively used in automobile industry is a

Castle nut
Jam nut
Sawn nut
Ring nut

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