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Theory of Machine

Theory of Machine
The Hooke's joint consists of:

Two forks
Four forks
One fork
Three forks

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Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Body contact
None of these
Line or point contact
Surface contact

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

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Theory of Machine
The motion of a shaft in a circular hole is an example of

Completely constrained motion
Successfully constrained motion
None of these
Incompletely constrained motion

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Theory of Machine
If there are L number of links in a mechanism, then number of possible inversions is equal to

L
L + 1
L + 2
L - 1

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Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

(S₁ + S₂) / h
(S₁ + S₂) / 2h
(S₁ - S₂) / h
(S₁ - S₂) / 2h

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