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Machine Design

Machine Design
The groove angle of pulleys for V-belt is

More than 400
420 to 450
300 to 320
340 to 360

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

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

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

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Machine Design
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

15 times
20 times
10 times
5 times

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Machine Design
A hot short metal is

Brittle under all conditions
Brittle when cold
Brittle when hot
Ductile at high temperature

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Machine Design
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

4
10
8
6

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