Consider the following statements: 1. Critical or 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 several loads. Which of these statements is/are correct?

Consider the following statements: 1. Critical or whir

1.	Consider the following statements: 1. Critical or 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 several loads. Which of these statements is/are correct?
A.	1 only
B.	2 and 3
C.	1 and 3
D.	1, 2 and 3
Answer» B. 2 and 3

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