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Machine Design

Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.2
0.65
0.35
0.5

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Machine Design
Taper usually provided on cotter is

1 in 5
1 in 24
1 in 40
1 in 10

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Machine Design
For hardening alloy steels and high speed steels, they are heated to

1300 to 1500°C
1100 to 1300°C
500 to 600°C
700 to 900°C

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

(p - d) t.σc
n.d.t.σc
p.t.σc
p.d.σc

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Machine Design
Belt slip may occur due to

All of these
Heavy load
Driving pulley too small
Loose belt

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Machine Design
Creep in belt is due to

Material of the pulley
All of these
Material of the belt
Uneven extensions and contractions due to varying tension

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