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Theory of Machine

Theory of Machine
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

360°
90°
180°
0°

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Theory of Machine
The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is

30195
9/128
44082
44090

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Theory of Machine
A spring controlled governor is said to be unstable when the controlling force

Decreases as the radius of rotation increases
Remains constant for all radii of rotation
Increases as the radius of rotation increases
Increases as the radius of rotation decreases

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Theory of Machine
In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is

0°
180°
90°
270°

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Theory of Machine
Creep in belt drive is due to

Uneven extensions and contractions due to varying tension
Material of the pulley
Larger size of the driver pulley
Material of the belt

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

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

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