GATE ME 2014 Set 2 — Question 19
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Theory of Machines & Vibrations → Forced Vibration → Magnification & Transmissibility
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Question
In vibration isolation, which one of the following statements is NOT correct regarding Transmissibility ()?
Correct answer
(B) T can be always reduced by using higher damping at any excitation frequency
Solution
Transmissibility () is given by the formula:where is the frequency ratio and is the damping ratio.
- (A) As , . So is nearly unity at small excitation frequencies. (Correct statement)
- (B) For , increasing the damping ratio actually increases the transmissibility . Therefore, cannot be always reduced by using higher damping. (Incorrect statement)
- (C) At , regardless of the value of . (Correct statement)
- (D) At resonance (), if the system is undamped (), . (Correct statement)
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