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Machine Design

Machine Design
Which of the following material has the maximum ductility?

Aluminium
Copper
Zinc
Mild steel

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Machine Design
The ratio of driving tensions in V-belt drives is __________ flat belt drives.

sin α times less than
sin α times more than
Equal to
cosec α times more than

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Machine Design
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to(Where, Pc = tension in belt due to centrifugal force)

3 Pc
1 Pc
2 Pc
Pc/3

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Machine Design
When two springs are in series (having stiffness K), the equivalent stiffness will be

K
K/4
K/2
2K

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Machine Design
In leaf springs, the longest leaf is known as

Lower leaf
Master leaf
Upper leaf
None of these

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Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is less than crushing strength
None of these
Shear strength is equal to crushing strength
Shear strength is greater than crushing strength

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