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Machine Design

Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

Same
None of these
Less
More

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Machine Design
Idler pulley is used for

For applying tension
Increasing velocity ratio
All of these
Changing the direction of motion of belt

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Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

45°
67.5°
22.5°
90°

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Machine Design
In order to obtain bolt of uniform strength

Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Increase shank diameter
Tighten die bolt properly
Increase its length

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

P1 - P2
⅟₂ × (P1 + P2)
[⅟₂ × (P1 + P2)] + Pc
P1 + P2

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Machine Design
The size of a cam depends upon

Pitch curve
Base circle
Prime circle
Pitch circle

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