Engineering Mechanics
The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

2D/(d₁ - d₂)
2D/(d₁ + d₂)
D/(d₁ + d₂)
D/(d₁ - d₂)

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Engineering Mechanics
Which of the following statement is incorrect?

The ratio of the limiting friction to the normal reaction is called coefficient of friction
A force acting in the opposite direction to the motion of the body is called force of friction
A machine whose efficiency is 100% is known as an ideal machine
The velocity ratio of a machine is the ratio of load lifted to the effort applied

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