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Machine Design

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

Buttress
NPT (national pipe threads).
Metric
Square

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Machine Design
The material used for brake lining should have __________ coefficient of friction.

Moderate
High
Low
None of these

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Machine Design
Lewis equation is applied

To stronger of the pinion or gear
Only to the gear
Only to the pinion
To weaker of the pinion or gear

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Machine Design
The spring mostly used in gramophones is

Conical spring
Volute spring
Flat spiral spring
Helical spring

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

P1 + P2
⅟₂× (P1 + P2)
[⅟₂ × (P1 + P2)] + Pc
[(√P1 + √P2)/2]²

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Machine Design
The edges of a boiler plate are bevelled to an angle of

30°
45°
60°
80°

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