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Machine Design

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

(p - d) σt
p.t.σt
p.d.σt
(p - d) t.σt

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Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Cold working
Grinding and lapping surface
Hot working
Shot peening

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

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Machine Design
A screw will be self locking, if

Efficiency of screw is 100%
Friction angle is equal to helix angle
Friction angle is more than helix angle
Friction angle is less than helix angle

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Machine Design
Which of the following welded joint is designed for shear strength?

Butt welded joint
Transverse fillet welded joint
All of these
Parallel fillet welded joint

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Machine Design
Crushing resistance required to crush the rivet per pitch length is

n.d.t.σc
p.d.σc
p.t.σc
(p - d) t.σc

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