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The critical speed of a uniform shaft with a rotor at the centre of the span can be reduced by

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1. Geared vibration 2. Damped - free vibration 3. Forced vibration

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The natural frequency of the system is given by

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The critical speed of a uniform shaft with a rotor at the centre of the span can be reduced by

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The amplitude versus time curve of as damped free vibration is shown in the below figure. Curve labeled ‘A’ is

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The equivalent length of the shaft is equal to

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Shown in the figure then the resulting deflection will be given by

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The phase angle between them then the vectors C and D represent respectively.

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Which is the equivalent stiffness

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A damped free vibration is expressed by the general equation

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Match List – I with List – II and select the correct answer using the codes given below the lists

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The critical speed of a rotating shaft depends upon

asked Dec 16, 2017 in tom by chandu (215k points)

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The frequency of oscillations of the block along the axis of the spring is

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The damping ratio of the system is

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When the mass of a critically damped single degree of freedom system is

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The natural frequency is greater than

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The transfer function of the system is

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What will be the frequency when one more similar spring added in series as shown in figure 2?

asked Dec 16, 2017 in tom by chandu (215k points)

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Critical speed of the shaft in the second case is

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The transmissibility of vibrations will be

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