1.

The axes of the two shafts are intersecting and are at 25° to each other. These two shafts are connected by Hook’s joint. At which position of the drives shaft velocity ratio will be maximum?(a) 90°, 270°(b) 0°, 180°(c) 180°, 270°(d) 90°, 180°This question was addressed to me in semester exam.I would like to ask this question from Universal Joints and Differential topic in section Chassis & Transmission System of Automobile Engineering

Answer»

Correct answer is (B) 0°, 180°

To explain I would say: (ωB / ωA) = (cos α) / (1 – cos^2θ sin^2α) where A = driving SHAFT and B = driven shaft and α is the angle between shaftA and shaft B. θ is the angle through which the shaft A rotates. Velocity ratio is maximum when θ = nπ where N = 1, 2, 3, …… i.e. θ = θ° or 180°.


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