Which type of method is known as resistance Start Motor?

The correct answer is option 2):(Split phase motor )

Concept:

Split Phase Induction Motor:

• The Split Phase Motor is also known as a Resistance Start Motor. It has a single cage rotor, and its stator has two windings known as main winding and starting winding.
• Both the windings are displaced 90 degrees in space.
• The main winding has very low resistance and a high inductive reactance whereas the starting winding has high resistance and low inductive reactance.

• A resistor is connected in series with the auxiliary winding. The current in the two windings is not equal as a result the rotating field is not uniform.
• Hence, the starting torque is small, of the order of 1.5 to 2 times of the start, running torque. At the start of the motor both the windings are connected in parallel.