Synchronous Motor MCQ Part 7

Multiple choice questions on Synchronous motor with brief explanatory answers.

Synchronous Motor MCQ Part 7

The pull-out torque of a 3 phase synchronous motor varies as

The pull-out torque of a synchronous motor varies as:

  1. 1/V
  2. Voltage
  3. Square of voltage
  4. Square root of voltage

Correct answer: 2. Voltage

Explanation:

The pull-out torque of a synchronous motor is mathematically defined as:

The steady-state speed of the motor is constant from no load to the maximum torque that the motor can supply: which is called the pull-out
torque.

The maximum or pull-out torque of motor is given by the following relationship:

τ = (3 Vϕ.EA)/(ωm.Xs)

From above equation one can understand that the pull-out torque of motor varies as the voltage.

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