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Machine Design

Machine Design
The contact ratio for gears is

Less than one
None of these
Greater than one
Zero

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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)

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

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Machine Design
The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Best method
Has no effect as regards fatigue strength
Cheapest method
Extremely hazardous

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Machine Design
A flange coupling is used to connect two shafts

Which are perfectly aligned
Have lateral misalignment
Whose axes intersect at a small angle
Which are not in exact alignment

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Machine Design
The suitable material for belt in agricultural machinery is

Leather
Rubber
Balata gum
Cotton duck

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Machine Design
In order to obtain bolt of uniform strength

Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Tighten die bolt properly
Increase its length
Increase shank diameter

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