Theory of Machine
In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

There is no such relationship
Greater than sum of other two
Less than sum of other two
Equal to sum of other two

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Theory of Machine
Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is

π (r₁ + r₂) + (r₁ - r₂)²/x + 2x
π (r₁ - r₂) + (r₁ + r₂)²/x + 2x
π (r₁ + r₂) + (r₁ + r₂)²/x + 2x
π (r₁ - r₂) + (r₁ - r₂)²/x + 2x

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

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

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