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Machine Design

Machine Design
According to Indian standards, total numbers of tolerance grades are

12
18
20
8

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

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

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Machine Design
Which is positive drive?

Timing belt
Crossed belt drive
Flat belt drive
V belt drive

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Machine Design
Stress concentration in static loading is more serious in

Depends on other factors
Brittle materials
Ductile materials
Equally serious in both cases

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Machine Design
The expression 0.175 - 0.841/T is the Lewis form factor for

20° stub system
None of these
20° full depth involute system
14½° composite and full depth involute system

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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)

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

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