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Machine Design

Machine Design
If two springs are in parallel then their overall stiffness will be

Half
None of these
Same
Double

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Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is less than crushing strength
None of these
Shear strength is equal to crushing strength
Shear strength is greater than crushing strength

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Machine Design
When spring index increases, the value of Wahl's stress factor

Increases linearly
Increases exponentially
Decreases linearly
Remains same

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.5
3.5
3.0
2.8

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Machine Design
If a bearing is designated by the number 305, it means that the bearing is of

Medium series whose bore is 25 mm
Light series whose bore is 5 mm
Medium series whose bore is 5 mm
Light series whose bore is 25 mm

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Machine Design
In thrust bearings, the load acts

Parallel to the axis of rotation
Perpendicular to the axis of rotation
In any direction
Along the axis of rotation

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