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Machine Design

Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.65
0.35
0.5
0.2

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Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Decreases
Remains unchanged
Increases
None of these

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Machine Design
The bending stress in a curved beam is

Maximum at the neutral axis
Zero at the centroidal axis
Zero at the point other than centroidal axis
None of these

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Machine Design
The period during which the cam follower remains at rest, when cam moves, is known as

Constant period
Idle period
Fixed period
Dwell period

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(8WD/ πd3) × K
(WD/ πd3) × K
(2WD/ πd3) × K
(4WD/ πd3) × K

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Machine Design
The suitable material for belt in agricultural machinery is

Balata gum
Leather
Cotton duck
Rubber

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