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Machine Design

Machine Design
A bench vice has following type of threads

Acme
Metric
Square
Buttress

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Machine Design
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as

M8 - 6d
M6 - 8d
M6
M8

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Machine Design
Crushing resistance required to crush the rivet per pitch length is

p.t.σc
p.d.σc
(p - d) t.σc
n.d.t.σc

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Machine Design
The anti-friction bearings

Can carry both radial and thrust loads
Have high initial cost
Have low starting and low running friction at moderate speeds
All of these

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Machine Design
In Vickers hardness testing, the pyramid indentor apex is

122°
40°
136°
152°

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Machine Design
The ratio of the ultimate stress to the design stress is known as

Strain
Factor of safety
Bulk modulus
Elastic limit

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