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Theory of Machine

Theory of Machine
The relative velocity of B with respect to A in a rigid link AB is

Parallel to AB
Along AB
At 45° to AB
Perpendicular to AB

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Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

The shafts are rotating at very high speeds
Resonance is caused due to the heavy mass of the rotor
Bearing centre line coincides with the axis
The system is unbalanced

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Theory of Machine
The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

2
4
3
1

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Theory of Machine
In its simplest form, a cam mechanism consists of following number of links

4
3
2
1

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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)

Equal to unity
Less than unity
Greater than unity
Zero

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Theory of Machine
The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be

To raise the stern and lower the bow
To lower the bow and stern
To raise the bow and lower the stern
To raise the bow and stern

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