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Machine Design

Machine Design
Which one of the following is a positive drive?

Crossed flat belt drive
Rope drive
V-belt drive
Chain drive

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Machine Design
The constant factor in case of R10 series of preferred numbers is

1.58
1.26
1.12
1.06

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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
In cylindrical cams, the follower moves

In any direction irrespective of cam axis
Along the cam axis
In a direction parallel to the cam axis
In a direction perpendicular to the cam axis

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Machine Design
In a butt welded joint, the size of weld is __________ the throat of weld.

2 times
Equal to
Double
0.5 times

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Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

Shear
All of these
Compression
Tension

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