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Machine Design

Machine Design
Shear stress theory is applicable for

All of these
Brittle materials
Elastic materials
Ductile materials

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Machine Design
According to Indian standards, total numbers of tolerance grades are

18
20
12
8

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

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Machine Design
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

2 d
d
2.5 d
1.5 d

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Machine Design
The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Has no effect as regards fatigue strength
Extremely hazardous
Cheapest method
Best method

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Machine Design
Antifriction bearings are

Thin lubricated bearings
Hydrodynamic bearings
None of these
Sleeve bearings

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