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Theory of Machine

Theory of Machine
The minimum force required to slide a body of weight W on a rough horizontal plane is

W sinθ
W cosecθ
W cosθ
W tanθ

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Theory of Machine
A kinematic chain requires at least

5 links and 4 turning pairs
4 links and 4 turning pairs
2 links and 3 turning pairs
3 links and 4 turning pairs

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Theory of Machine
In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is

12
32
25
16

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Theory of Machine
In an open pair, the two elements of a pair

Are not held together mechanically
Have a line or point contact when in motion
Are kept in contact by the action of external forces, when in motion
Have a surface contact when in motion

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Theory of Machine
The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called

None of these
Radial component
Tangential component
Coriolis component

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Theory of Machine
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Clearance between journal and bearing
Radius of journal
Magnitude of the forces on journal
Angular velocity of journal

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