Question

Choose the correct statements about forced vibration:

• A. There is a presence of external periodic force.
• B. The frequency of vibration is equal to the frequency of the applied force.
• C. The amplitude of vibration does not depend on the frequency of the applied force.
• D. The frequency of vibration changes with a change in frequency of the applied force.

Answer 1

Answer: (A), (B), (D)

The correct options are
A There is a presence of external periodic force.
B The frequency of vibration is equal to the frequency of the applied force.
D The frequency of vibration changes with a change in frequency of the applied force.

The vibrations of a body which take place under the influence of an external periodic force acting on it, are called the forced vibrations. When the external periodic force is applied to the vibrating body, the body gradually acquires the frequency of the applied periodic force. The frequency of vibration of the body depends on the frequency of the source.