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Theory of Machine

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

D₁.D₂
D₂/D₁
D₁
D₁/D₂

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Theory of Machine
A system in dynamic balance implies that

There will absolutely no wear of bearings
There is no critical speed in the system
The system is also statically balanced
The system is critically damped

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Theory of Machine
A spring controlled governor is said to be isochronous when the controlling force

Decreases as the radius of rotation increases
Increases as the radius of rotation decreases
Remain constant for all radii of rotation
Increases as the radius of rotation increases

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Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

Bearing centre line coincides with the axis
Resonance is caused due to the heavy mass of the rotor
The system is unbalanced
The shafts are rotating at very high speeds

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Theory of Machine
The lead screw of a lathe with nut forms a

Screw pair
Sliding pair
Rolling pair
Turning pair

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Theory of Machine
When a point moves along a straight line, its acceleration will have

Radial component only
Tangential component only
Coriolis component only
Radial and tangential components both

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