Theory of Machine
In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

n₁ + n₂
n₁ + n₂ + 1
n₁ + n₂ - 2
n₁ + n₂ - 1

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Theory of Machine
A rigid body, under the action of external forces, can be replaced by two masses placed at a fixed distance apart. The two masses form an equivalent dynamical system, if

The sum of the two masses is equal to the total mass of body
The sum of mass moment of inertia of the masses about their center of gravity is equal to the mass moment of inertia of the body
The center of gravity of the two masses coincides with that of the body
All of these

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Theory of Machine
Which of the following statement is correct for involute gears?

A convex flank is always in contact with concave flank.
The pressure angle is constant throughout the teeth engagement.
The variation in centre distance of shafts increases radial force.
The interference is inherently absent.

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