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Machine Design

Machine Design
The stress in the threaded part of the bolt will be __________ as compared to the shank.

Lower
Higher
Same
None of these

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd⁴/ 8D²n
Gd⁴/ 8D3n
Gd⁴/ 4D3n
Gd3/ 8D3n

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Machine Design
The shock absorbing capacity of a bolt may be increased by

Tightening the bolt properly
Making the shank diameter equal to core diameter of thread
Increasing its shank diameter
Decreasing its shank diameter

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Machine Design
The function of a washer is to

Provide bearing area
Absorb shocks and vibrations
Provide smooth surface in place of rough surface
Provide cushioning effect

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Machine Design
I.S. specifies following total number of grades of tolerances

16
22
20
18

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Machine Design
A screw is said to be a self locking screw, if its efficiency is

Less than 50%
Equal to 50%
More than 50%
None of these

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