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Machine Design

Machine Design
Shear stress theory is applicable for

Elastic materials
Ductile materials
All of these
Brittle materials

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Machine Design
A riveted joint is a __________ fastening.

None of these
Temporary
Either A or B
Permanent

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Machine Design
According to Indian standards, total numbers of fundamental deviations are

20
15
25
10

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

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

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Machine Design
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where d = Diameter of bolt hole)

Greater than 30d
Less than 20d
Between 20d and 30d
Equal to inside diameter of pipe

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

3.0
2.8
2.5
3.5

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