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Machine Design

Machine Design
The included angle for the British Association thread is

55°
29°
60°
47.3°

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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
2 τ
τ
4 τ

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Machine Design
The cross-section of the arm of a bell crank lever is

Elliptical
Rectangular
I-section
Any one of these

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Machine Design
Shaft coupling is used in machinery to

Introduce mechanical flexibility
All of these
Reduce the transmission of shock loads
Introduce protection against over loads

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Machine Design
In a steam engine, the valve rod is connected to an eccentric rod by means of

Knuckle joint
Universal joint
Cotter joint
Flange coupling

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Machine Design
A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called

Plasticity
Malleability
Elasticity
Ductility

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