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

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

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Theory of Machine
The inversion of a mechanism is

Obtained by fixing different links in a kinematic chain
Changing of a higher pair to a lower pair
Obtained by reversing the input and output motion
Turning its upside down

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Theory of Machine
The velocity of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead center, and n = Ratio of length of connecting rod to the radius of crank)

ω²r [sin θ + (sin 2θ/n)]
ω²r [cos θ + (cos 2θ/n)]
ωr [cos θ + (cos 2θ/n)]
ωr [sin θ + (sin 2θ/n)]

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

The algebraic sum of the secondary forces must be equal to zero
None of these
Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero

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