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Theory of Machine

Theory of Machine
A cam mechanism imparts following motion

All of these
Rotating
Oscillating
Reciprocating

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

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Theory of Machine
When the sleeve of a Porter governor moves downwards, the governor speed

First increases and then decreases
Increases
Remain unaffected
Decreases

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

G².I₂
I₂/G
G.I₂
I₂/G²

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Theory of Machine
A cam with a roller follower would constitute following type of pair

Higher pair
Open pair
Close pair
Lower pair

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Theory of Machine
In a disc clutch, if there are n₁ number of discs on the driving shaft and n₂ number of discs on the driven shaft, then the number of pairs of contact surfaces will be

n₁ + n₂
n₁ + n₂ - 2
n₁ + n₂ + 1
n₁ + n₂ - 1

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