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Theory of Machine

Theory of Machine
The size of cam depends upon

Pitch circle
Base circle
Pitch curve
Prime circle

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Theory of Machine
Shaft revolving in a bearing is the following type of pair

Higher pair
Lower pair
Spherical pair
Cylindrical pair

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Theory of Machine
The frictional torque transmitted by a cone clutch is same as that of

Conical pivot bearing
Flat pivot bearing
Truncated conical pivot bearing
Flat collar bearing

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Theory of Machine
The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by

ω². (r₁ r₂). (1 - cos² θ)
ω². (r₁ - r₂). (1 - sin² θ)
ω². (r₁ + r₂). (1 + cos² θ)
ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0. If the roots of this equation are real, then the system will be

Under damped
Without vibrations
Critically damped
Over-damped

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Theory of Machine
In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)

(r₁ + r₂) (x/y)
(r₁ + r₂) (y/x)
(r₁ - r₂) (y/x)
(r₁ - r₂) (x/y)

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