engineering recuitment BHEL Engineer Trainee Mock Test 2025 Mechanical Vibrations Undamped Free Vibration Resonance and Whirling
The Smallest and largest natural frequencies of a 'n' degree freedom system are ω1 and ωn respectively. The approximate natural frequency estimated by Rayleigh’s and Dankerley’s methods is ωr and ωd respectively. Which of the following statements is true?
1
ωr < ω1 and ωd < ω1
2
ωr < ω1 and ωd > ω1
3
ωr > ω1 and ωd > ω1
4
ωr > ω1 and ωd < ω1