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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/6
d/8
d/4
d/2

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Machine Design
The stretching in a belt can be controlled by __________ the stress in the belt.

Both A and B
Increasing
None of these
Reducing

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Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

None of these
Thrice
Half
Twice

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Machine Design
The strength of a riveted joint is equal to

Least value of Pt Ps and Pc
Shearing strength of rivet (Ps)
Tearing strength of plate (Pt)
Crushing strength of rivet (Pc)

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Machine Design
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

π/4 × d² × tτu
πd.t.τu
t.τu
π/4 × d².τu

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Machine Design
The edges of a boiler plate are bevelled to an angle of

45°
80°
60°
30°

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