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Machine Design

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

High
None of these
Low
Moderate

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Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

Axially downwards
Axially upwards or downwards
None of these
Axially upwards

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Machine Design
The strength of the unriveted plate (P) per pitch length is equal to

(p - d) t.σt
(p - d) σt
p.t.σt
p.d.σt

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Machine Design
In the levers of first type, the mechanical advantage is ________ one.

More than
Less than
None of these
Equal to

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Machine Design
When a hole of diameter ‘d’ is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where τu = Ultimate shear strength of the material of the plate)

π/4 × d² × tτu
π/4 × d².τu
πd.t.τu
t.τu

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Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.4
0.33
0.5
0.55

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