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Machine Design

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

Metric
NPT (national pipe threads).
Buttress
Square

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Machine Design
The suitable material for belt used in flour mill is

Canvas or cotton duck
Leather
Rubber
Balata gum

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Machine Design
In a butt welded joint, the size of weld is __________ the throat of weld.

Double
Equal to
2 times
0.5 times

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Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

Direct shear stress only
A combination of bending stress and direct shear stress
Bending stress only
A combination of torsional shear stress and bending

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Machine Design
The expansion joint is mostly used for pipes which carry steam at __________ pressures.

None of these
Low
Medium
High

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Machine Design
If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Be independent of ratio of mass of load W to mass of bar (y)
Increase with increase in y
Decrease with decrease in y
Depend on other considerations

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