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Which of the following methods can be used to determine the damping of machine element?

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

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Its natural frequency is

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Then at the critical speed, the relative positions of G and S are given by

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When the shaft is rotated a 300 revolutions per minute, it will whirl with a radius of

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

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The lowest critical speed is

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The equivalent length of the shaft is

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A system is shown in the following figure. The bar AB is assumed to be rigid and weightless

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The critical damping coefficient of this system is

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Match List –I (Force transmissibility) with List-II (frequency ratio)

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The dynamic amplitude of the machine will be

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Critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

asked Dec 15, 2017 in tom by chandu (215k points)

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Rotating shafts tends to vibrate violently at whirling speeds because

asked Dec 15, 2017 in tom by chandu (215k points)

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The natural frequency of the system is given by

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The natural frequency of the system will

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If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

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In the two-rotor system shown in the given figure, (I1 < I2), a node of vibration is situated

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With symbols having the usual meanings, the single degree of freedom system,

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Match List I(Forces) with List –II (Mathematical expression)

asked Dec 15, 2017 in tom by chandu (215k points)

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(A) Governor (B) Automobile differential (C) Dynamic Absorber (D) Engine Indicator

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Under logarithmic decrement, the amplitude of successive vibrations are

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