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Theory of Machine

Theory of Machine
The critical speed of a shaft depends upon its

Mass
Stiffness
Mass and stiffness
Stiffness and eccentricity

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Theory of Machine
In gramophones for adjusting the speed of the turntable, the following type of governor is commonly employed

Pickering governor
Inertia governor
Wilson Hartnell governor
Hartung governor

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Theory of Machine
The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve)

m/(m + M)
M/(m + M)
(m + M)/m
(m + M)/M

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Theory of Machine
When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

Hunt
Stable
Unstable
Isochronous

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

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

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Theory of Machine
When two links are connected by a pin joint, their instantaneous center lies

At the center of curvature
At the center of circle
At the pin joint
On their point of contact

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MORE MCQ ON Theory of Machine

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