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Machine Design

Machine Design
Taper usually provided on cotter is

1 in 24
1 in 10
1 in 40
1 in 5

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Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

None of these
Thrice
Half
Twice

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

P1 + P2
[(√P1 + √P2)/2]²
[⅟₂ × (P1 + P2)] + Pc
⅟₂× (P1 + P2)

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (b/3a)]
σ [1 + (b/2a)]
σ [1 + (3a/b)]
σ [1 + (2a/b)]

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Machine Design
In standard taper roller bearings, the angle of taper of outer raceway is

5°
25°
15°
8°

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Machine Design
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

Double
One-fourth
One-half
Same

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