How much phase angle is made between main winding and starting winding in capacitor start single phase induction motor? 

The correct answer is option 2):(90 degree )

Concept:

• ​A capacitor-start motor is a single-phase induction motor that employs a capacitor in the auxiliary winding circuit to produce a greater phase difference between the current in the main and the auxiliary windings.
• The figure below shows the connection diagram of a capacitor start motor.

• The capacitor start motor has a cage rotor and has two windings on the stator.
• They are known as the main winding and the auxiliary or the starting winding.
• The two windings are placed 90 degrees apart. A capacitor CS is connected in series with the starting winding.
• A centrifugal switch SC is also connected to the circuit. The phasor diagram of the capacitor start motor is shown below
• 
• I_M is the current in the main winding which is lagging the auxiliary current I_A by 90 degrees as shown in the phasor diagram above.
• The auxiliary current I_A leads the voltage. As the motor approaches its rated speed, the auxiliary winding and the starting capacitor are disconnected automatically by the centrifugal switch provided on the shaft of the motor.