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Theory of Machine

Theory of Machine
Cam size depends upon

Pitch circle
Prime circle
Outer circle
Base circle

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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
Line or point contact
Surface contact
None of these

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Theory of Machine
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

ω² × OQ tanθ
ω² × OQ sinθ
ω² × OQ
ω² × OQ cosθ

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

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Theory of Machine
The unbalanced primary forces in a reciprocating engine are

Not balanced
Balanced partially
Balanced completely
Balanced by secondary forces

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Theory of Machine
When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be

ω²r. (n + 1)/n
ω²r. n/(n + 1)
ω²r. n/(n - 1)
ω²r. (n - 1)/n

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