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Theory of Machine

Theory of Machine
The critical speed of a shaft depends upon its

Stiffness
Mass
Mass and stiffness
Stiffness and eccentricity

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

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

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Theory of Machine
The frictional torque transmitted by a disc or plate clutch is same as that of

Flat collar bearing
Truncated conical pivot bearing
Conical pivot bearing
Flat pivot bearing

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Theory of Machine
In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

0.8
0.4
0.2
0.6

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Theory of Machine
The danger of breakage and vibration is maximum

Above the critical speed
None of these
Below the critical speed
Near the critical speed

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Theory of Machine
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Simple pendulum
Compound pendulum
Second's pendulum
Torsional pendulum

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