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Machine Design

Machine Design
The contact ratio for gears is

None of these
Less than one
Zero
Greater than one

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Machine Design
According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

All of these
0.5 mm up to rivet diameter of 24 mm
2 mm for rivet diameter from 39 mm to 48 mm
1 mm for rivet diameter from 27 mm to 36 mm

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Machine Design
Stress concentration factor is defined as the ratio of

Maximum stress to the endurance limit
Nominal stress to the endurance limit
Nominal stress to the maximum stress
Maximum stress to the nominal stress

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

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

25°
15°
8°
5°

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Machine Design
A machine part subjected to _________ is called a strut.

A tangential force
Any one of these
An axial compressive force
An axial tensile force

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