A single-winding single-phase motor has ___

Electrical Engineering MCQ Electrical Machines MCQ
1

A single-winding single-phase motor has

A. low starting torque.
B. zero starting torque.
C. high starting torque.
D. starting torque equal to full-load torque.

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Answer: B

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The answer is B. zero starting torque.

A single-winding single-phase motor has a low starting torque because the magnetic field produced by the stator winding is not rotating. This means that there is no torque to start the motor rotating.

To overcome this problem, single-winding single-phase motors often have a centrifugal switch that connects a starting winding in parallel with the stator winding when the motor reaches a certain speed. The starting winding creates a rotating magnetic field that helps to start the motor rotating.

Here are some additional details about single-winding single-phase motors:

  • They are the most common type of single-phase motor.
  • They are used in a wide variety of applications, including fans, pumps, and appliances.
  • They are relatively inexpensive and easy to maintain.

Here are some of the advantages of single-winding single-phase motors:

  • They are simple to design and build.
  • They are relatively inexpensive.
  • They are easy to maintain.

Here are some of the disadvantages of single-winding single-phase motors:

  • They have low starting torque.
  • They can be noisy.
  • They can be inefficient.