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Machine Design

Machine Design
In the levers of __________ type, the mechanical advantage is less than one.

Third
None of these
Second
First

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ
2 τ
4 τ
τ/2

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

2 τ
τ/2
4 τ
τ

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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.τu
π/4 × d² × tτu
t.τu
πd.t.τu

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Machine Design
The shock resistance of steel is increased by adding

Nickel
Cobalt and molybdenum
Nickel and chromium
Chromium

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Machine Design
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

One end fixed and the other end hinged
Both the ends hinged
One end fixed and the other end free
Both the ends fixed

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