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Theory of Machine

Theory of Machine
The Hooke's joint consists of:

Three forks
Four forks
One fork
Two forks

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Theory of Machine
In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be

Unaffected of sensitivity
More sensitive
Less sensitive
Isochronous

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Theory of Machine
When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be

Unstable
None of these
Stable
Isochronous

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Theory of Machine
Governor is used in automobile to

Decrease the variation of speed
Maximize the fuel economy
Limit the vehicle speed
Maintain constant engine speed

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Theory of Machine
The velocity of sliding of meshing gear teeth is(Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)

(ω₁ + ω₂)/y
(ω₁/ω₂) y
(ω₁ × ω₂) y
(ω₁ + ω₂) y

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Theory of Machine
The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is

Equal to 1
Equal to 2
Greater than 2
Less than 2

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