Consider the following statements:
1. Criticalor whirling speed of the shaft is the speed at which it tends to vibrate violently in the
transverse direction
2. To find the natural frequency of a shaft carrying several loads the energy method gives
approximate results
3. Dunkerley’s method gives accurate results of the natural frequency of a shaft carrying
servral loads
Which of these statements is/are correct?
(a) 1 only (b) 2 and 3 (c) 1 and 3 (d) 1, 2 and 3