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Machine Design

Machine Design
Belt slip may occur due to

All of these
Heavy load
Loose belt
Driving pulley too small

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Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

0.35 to 0.45%
0.40 to 0.60%
0.20 to 0.40%
None of these

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Machine Design
The power transmitted by the belt drive can be increased by

Increasing the initial tension in the belt
All of these
Increasing wrap angle by using idler pulley
Dressing the belt to increase the coefficient of friction

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Machine Design
The algebraic difference between the maximum limit and the basic size is called

Upper deviation
Actual deviation
Lower deviation
Mean deviation

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

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Machine Design
The square threads are usually found on

Railway carriage couplings
Screw cutting lathes
Feed mechanism of machine tools
Spindles of bench vices

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