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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
D₁.D₂
D₁
D₂/D₁

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Theory of Machine
A system in dynamic balance implies that

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

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Theory of Machine
In its simplest form, a cam mechanism consists of following number of links

4
3
2
1

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Theory of Machine
The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

A single plane
Two planes
Four planes
Three planes

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Theory of Machine
A watt's governor can work satisfactorily at speeds from

60 to 80 r.p.m.
100 to 200 r.p.m.
200 to 300 r.p.m.
80 to 100 r.p.m.

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Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.50 mm
2 mm
3.0 mm
2.22 mm

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