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Theory of Machine

Theory of Machine
If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the

1
1.5
0.5
2

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Theory of Machine
Transmission angle is the angle between

Output link and fixed link
Input link and fixed link
Input link and coupler
Output link and coupler

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Theory of Machine
Governor is used in automobile to

Maximize the fuel economy
Limit the vehicle speed
Maintain constant engine speed
Decrease the variation of speed

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Theory of Machine
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)

(1/2π). √(q/I)
2π. √(q/I)
1/2π
2π qI

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Theory of Machine
Transmission of power from the engine to the rear axle of an automobile is by means of

Worm and wheel method
Compound gears
Crown gear
Hooke's joint

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Theory of Machine
A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

W CE / CS
W CE / 2CS
2 W CE / CS
W CS / 2CE

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