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Theory of Machine

Theory of Machine
The velocity of the belt for maximum power is (where m = Mass of the belt in kg per meter length)

√(T/3m)
(T.g)/3
√(3m/T)
T/3

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

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

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Theory of Machine
When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than

1
2
0.5
0.25

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Theory of Machine
The factor which affects the critical speed of a shaft is

Span of shaft
Eccentricity
Diameter of disc
All of the listed here

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Theory of Machine
The component of the acceleration, parallel to the velocity of the particle, at the given instant is called

Tangential component
None of these
Radial component
Coriolis component

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Theory of Machine
In considering friction of a V-thread, the virtual coefficient of friction (μ₁) is given by

μ₁ = μ/cos β
μ₁ = μ/sin β
μ₁ = μ cos β
μ₁ = μ sin β

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