engineering recuitment BHEL Engineer Trainee Mock Test 2025 Mechanical Vibrations Forced Vibration Transmissibility and Magnification Factor
"The ratio of the amplitude of the steady-state response to the static deflection is known as Magnification Factor". With respect to the above definition, which of the following statements is incorrect. [Take r as the ratio of forced frequency to natural frequency (ω/ωn)].
1
At resonance, the Magnification factor is a function of one variable only.
2
Magnification factor is infinite at resonance with ξ = 0
3
For given ξ, the maximum value of Magnification factor is at \(r_{opt}=\sqrt{1-2\xi^2}\;\)
4
For given ξ, the maximum value of Magnification factor is at \(r_{opt}=\sqrt{1-2\xi}\;\)