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Machine Design

Machine Design
The number of slots in a 25 mm castle nut is

6
8
4
2

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

p.d.σt
(p - d) σt
(p - d) t.σt
p.t.σt

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Machine Design
In cylindrical cams, the follower moves

Along the cam axis
In a direction perpendicular to the cam axis
In a direction parallel to the cam axis
In any direction irrespective of cam axis

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Machine Design
The connecting rod bolts are tightened up with initial tension greater than the external load so that

Bolts are weakest elements
Bolts will not loosen during service
The resultant load on the bolt would not be affected by the external cyclic load
Joint may not open up

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Machine Design
Residual stress in materials

Acts when external load is applied
Is independent of external loads
Is always harmful
Becomes zero when external load is removed

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the stress induced in the wire is

Tensile stress
Shear stress
Compressive stress
Bending stress

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