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Machine Design

Machine Design
The product of the diametral pitch and circular pitch is equal to

1
π × number of teeth
1/π
π

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

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Increasing the length of bar
All of these
Decreasing the cross-sectional area of the bar
Decreasing the modulus of elasticity of the bar

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Machine Design
Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

Twice
Sixteen times
Four times
Eight times

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Machine Design
The centre distance between two meshing involute gears is equal to

Difference of pitch circle radii/cosφ
Difference of base circle radii/cosφ
Sum of base circle radii/cosφ
Sum of pitch circle radii/cosφ

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Machine Design
The resilience of a bolt may be increased by

Increasing its shank diameter
Decreasing its shank diameter
Increasing its length
Decreasing its length

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