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Machine Design

Machine Design
Which is positive drive?

V belt drive
Timing belt
Crossed belt drive
Flat belt drive

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Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

5 to 10
0.5 to 1
1 to 2
3 to 5

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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
4 τ
τ/2
2 τ

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Machine Design
The strength of a riveted joint is equal to

Least value of Pt Ps and Pc
Shearing strength of rivet (Ps)
Tearing strength of plate (Pt)
Crushing strength of rivet (Pc)

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

Malleability
Plasticity
Elasticity
Ductility

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

5 mm
15 mm
10 mm
25 mm

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