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Machine Design

Machine Design
For tight leakage joints, following type of thread is best suited

Buttress
Metric
NPT (national pipe threads).
Square

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

l/√2
2 l
l
l/2

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

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

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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
Lower
Higher
Same

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Machine Design
The material generally used for aircraft components is

Mild steel
High speed steel
Stainless steel
Aluminium

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Machine Design
In levers, leverage is the ratio of

Load arm to the effort arm
Effort arm to the load arm
Load lifted to the effort applied
Mechanical advantage to the velocity ratio

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