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Higher Study | Mechanical Vibrations | Forced Vibration

There are four samples P, Q, R and S with natural frequencies 64, 96, 128 and 250 Hz respectively. They are mounted on test setups for conducting vibration experiments. If a loud pure note of frequency 144 Hz is produced by some instrument, which of the samples will show the most perceptible induced vibration?
 A mass of 50 kg suspended from one end of a helical spring, the other end being fixed. The stiffness of the spring is 100 N/m. The resistance of air damping is given as 0.1 N/m/s vibrating freely at its natural frequency of 10 rad/s. What will be the magnification factor at resonance of the spring?
When the frequency of the vibrating system becomes equal to the natural frequency of the system, this type of vibration is known as:
Consider the following statements. Transmissibility of vibrations (1) Is more than 1, when ω/ωn < √2  (2) Is less than 1, when ω/ωn > √2  (3) Increases as the damping is increased
When a system is subjected to forced vibrations, then under steady-state conditions
The vibration isolation for a forced vibration system is possible, when:
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