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Machine Design

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

12
8
18
20

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Machine Design
According to maximum normal stress theory, the maximum normal stress in the shaft is

σ + √(σ² × 4τ²)
(1/2) × [σ + √(σ² × 4τ²)]
(1/2) × √(σ² × 4τ²)
√(σ² × 4τ²)

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Machine Design
The pipe joint mostly used for pipes carrying water at low pressures is

Nipple joint
Union joint
Spigot and socket joint
Socket joint

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

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Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

0.75/(0.75 + √v)
6/(6 + v)
3/(3 + v)
4.5/(4.5 + v)

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Machine Design
The expansion joint is mostly used for pipes which carry steam at __________ pressures.

None of these
High
Low
Medium

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