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Machine Design

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

n.d.t.σc
p.t.σc
p.d.σc
(p - d) t.σc

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

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Machine Design
Which of the following screw thread is used for power transmission in one direction only?

Acme threads
Square threads
Buttress threads
Multiple threads

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Machine Design
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Crown bevel gears
Internal bevel gears
Mitre gears
Angular bevel gears

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Machine Design
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

3 times more
2 times more
4 times more
Same in both cases

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Machine Design
The maximum shear stress theory is used for

Brittle materials
Plastic materials
Nonferrous materials
Ductile materials

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