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Q.9 In vibration isolation, which one of the following statements is NOT correct regarding Transmissibility (T)?

1. (A) T is nearly unity at small excitation frequencies
2. (B) T can be always reduced by using higher damping at any excitation frequency
3. (C) T is unity at the frequency ratio of √2
4. (D) T is infinity at resonance for undamped systems

Correct answer: (B) T can be always reduced by using higher damping at any excitation frequency

Solution

Option B is incorrect because while increasing damping can reduce transmissibility, it does not guarantee a reduction at all excitation frequencies, especially in certain conditions where damping may not effectively mitigate resonance effects.

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