Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted
Both open belt drive and crossed belt drive is recommended
Open belt drive is recommended

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Theory of Machine
The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r₁ = Minimum radius of the cam, r₂ = Radius of the roller follower, and θ = Angle turned by the cam from the beginning of the follower displacement)

(r₁ - r₂) [(1 - cosθ)/cosθ]
(r₁ + r₂) [(1 - cosθ)/cosθ]
(r₁ - r₂) (1 - cosθ)
(r₁ + r₂) (1 + cosθ)

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Theory of Machine
Which of the following statement is correct as regard to the difference between a machine and a structure?

The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
All of these
The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work

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