Question

If we increase the angular speed of the rotor, the power of it will _________
1. decrease
2. increase
3. first increase then decrease
4. first decrease then increase

Answer 1

Correct Answer - Option 2 : increase

CONCEPT:

• Torque: The twist to an object around a specific axis is called torque. It is the vector product of position vector and force.
  • It is also known as the turning effect.

• The power of the rotor required to transmit energy to apply a torque τ to rotate it with angular velocity ω is

P = τ ω

EXPLANATION:

The power of a rotating rotor is given by

P = τ ω

P ∝ ω 

• So, if we increase the angular speed of the rotor, the power will increase.
• Hence, the correct answer is option 2.