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Theory of Machine

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

28
30
15
8

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Theory of Machine
When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Force-closed pair
Higher pair
Lower pair
Self-closed pair

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

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Theory of Machine
If ‘D₁’ and ‘D₂’ be the diameters of driver and driven pulleys, then belt speed is proportional to

D₁
D₂/D₁
D₁.D₂
D₁/D₂

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Theory of Machine
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to

Reduce slip
Reduce vibration
Ensure uniform loading
Ensure proper alignment

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Theory of Machine
The cam and follower is an example of

Lower pair
Sliding pair
Rolling pair
Higher pair

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