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Machine Design

Machine Design
A locking device extensively used in automobile industry is a

Sawn nut
Castle nut
Ring nut
Jam nut

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Machine Design
Wahl's stress factor __________ very rapidly as the spring index decreases.

Remain same
Decreases
None of these
Increases

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

None of these
Higher
Lower
Same

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ/2
τ
2 τ
4 τ

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Machine Design
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________.

Less than unity
Equal to 1
Greater than unity
None of these

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Machine Design
Wire ropes as compared to cotton ropes

Are lighter in weight
Can withstand shock loads
Offer silent operation
All of these

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