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Machine Design

Machine Design
The included angle for the British Association thread is

55°
47.3°
29°
60°

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Machine Design
The piston rod of a steam engine is usually connected to the cross-head by means of

Cotter joint
Knuckle joint
Universal joint
Bolted joint

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Machine Design
In order to remove internal stresses produced by hardening the steel, the process usually adopted is

Normalizing
Annealing
Tempering
Spheroidizing

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given by Where m = mass of belt per meter (kg/m) v = belt velocity (m/s) f = coefficient of friction a = angle of wrap (radians)

P1 / P2 = eᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα
P1 / P2 = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα

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Machine Design
The resultant axial load on a bolt depends upon

Relative elastic yielding of the bolt and the connected members
Initial tension due to tightening of the bolt
All of these
External load applied

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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
2 τ
τ/2

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