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Machine Design

Machine Design
According to Indian standards, total numbers of fundamental deviations are

15
10
20
25

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

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Machine Design
An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the

Tip of the gear and flank of pinion
Flanks of both gear and pinion
Tip of both gear and pinion
Tip of the pinion and flank of gear

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

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

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Machine Design
The fatigue life of a part can be improved by

Polishing
Electroplating
Coating
Shot peening

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Machine Design
The rolling contact bearings are known as

Thick lubricated bearings
Antifriction bearings
Plastic bearings
Thin lubricated bearings

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