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Machine Design

Machine Design
Guest's theory is used for

Ductile materials
Plastic materials
Elastic materials
Brittle materials

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Machine Design
The efficiency of a riveted joint is equal to

Ps /P
Pt /P
Least of Pt, Ps and Pc/P
Pc /P

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Machine Design
The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

Gd⁴/ 8D3n
Gd⁴/ 4D3n
Gd⁴/ 8D²n
Gd3/ 8D3n

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Machine Design
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

P/√2.s.l
P/2.s.l
2P/s.l
√2P/s.l

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Machine Design
In the assembly of pulley, key and shaft

Key is made the strongest
Key is made the weakest
All the three are designed for equal strength
Pulley is made the weakest

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Machine Design
The property of a material which enables it to resist fracture due to high impact loads is known as

Strength
Toughness
Elasticity
Endurance

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