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Machine Design

Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

Compression
Tension
Shear
All of these

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Machine Design
A locking device extensively used in marine type connecting rod ends is a

Jam nut
Castle nut
Ring nut
Sawn nut

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Machine Design
In the assembly of pulley, key and shaft

Pulley is made the weakest
Key is made the strongest
All the three are designed for equal strength
Key is made the weakest

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Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/4
d/2
d/8
d/6

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Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Depends on heat treatment carried out
Increases markedly
Remain same
Decreases markedly

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Machine Design
The form factor of a helical gear __________ with the increase in the helix angle.

Increases
Remains constant
Decreases
None of these

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