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Theory of Machine

Theory of Machine
The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.

Same as
More than
Less than
None of these

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Theory of Machine
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

Less than unity
Greater than unity
Zero
Equal to unity

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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
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.22 mm
2 mm
2.50 mm
3.0 mm

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Theory of Machine
The behaviour of gases can be fully determined by

4 laws
2 laws
3 laws
1 law

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Theory of Machine
The secondary unbalanced force is __________ the primary unbalanced force.

Two-third
1/n times
n times
One-half

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