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Machine Design

Machine Design
Which of the following property is essential for spring materials?

Stiffness
Ductility
Plasticity
Resilience

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Machine Design
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

Increase the key length
Increase the key width
Decrease the key length
Increase the key depth

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

Higher
Same
Lower
None of these

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Machine Design
In unilateral system of tolerance, the tolerance is allowed on

One side of the nominal size
Both sides of the nominal size
One side of the actual size
Both sides of the actual size

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Machine Design
The pitch of threads on a Jock nut in comparison to pitch of nut is

Very fine
Finer
Coarser
Same

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Machine Design
If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

138 d
168 d
151 d
124 d

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