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Machine Design

Machine Design
According to Indian standards, total numbers of fundamental deviations are

25
15
20
10

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Machine Design
Resistance to fatigue of a material is measured by

Young's modulus
Endurance limit
Coefficient of elasticity
Elastic limit

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Machine Design
Basic hole is one

Whose upper deviation is zero
Whose lower deviation is zero
Whose lower as well as upper deviations are zero
Does not exist

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Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Pitch circle diameter × sinφ
Addendum circle diameter × cosφ
Pitch circle diameter × cosφ
Clearance circle diameter × cosφ

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Machine Design
The backlash for spur gears depends upon

Pitch line velocity
Module
Tooth profile
Both module and pitch line velocity

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Machine Design
Deep groove ball bearings are used for

Radial load at high speed
Small angular displacement of shafts
Heavy thrust load only
Combined thrust and radial loads at high speed

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