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Theory of Machine

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

28
30
8
15

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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

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

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Theory of Machine
A Hartnell governor is a

Spring loaded governor
Dead weight governor
Inertia governor
Pendulum type governor

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Theory of Machine
The driving and driven shafts connected by a Hooke's joint will have equal speeds, if

tanθ = ± cosα
cosθ = sinα
cotθ = cosα
sinθ = ± tanα

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Theory of Machine
The advantage of the piston valve over the slide valve is that in the former case

The pressure developed being high provides tight sealing
Both wear and power absorbed are low
Wear is less
Power absorbed is less

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Theory of Machine
When a point at the end of a link moves with constant angular velocity, its acceleration will have

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

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