Theory of Machine
A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is

5,367 r.p.m.
12,000 r.p.m.
9,360 r.p.m.
6,000 r.p.m.

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Theory of Machine
Oldham's coupling is the

Second inversion of double slider crank chain
Third inversion of double slider crank chain
Third inversion of slider crank chain
Second inversion of single slider crank chain

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Theory of Machine
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?

The centre of the disc has centrifugal acceleration
The point on the disc making contact with the plane surface has zero acceleration
All points of the disc have the same velocity
The centre of the disc has zero acceleration

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