AC THREE PHASE MOTOR - Practice Mode

1) What is the name of 3 phase motor winding, if the coil pitch is less than pole pitch?

Full pitch winding Whole coil winding Long chorded winding Short chorded winding

Correct Answer: Short chorded winding

2) Which is the demerit of 3 phase concentric winding?

More space is required A stepped former is required More difficult to shape the coils uniformly It is not easy to make the end connection

Correct Answer: A stepped former is required

3) Calculate the phase displacement in terms of slots for a 3 phase, 36 slots, 12 coils, 4 pole stator winding?

3 slots 4 slots 6 slots 8 slots

Correct Answer: 8 slots

4) Which type of AC motor winding having the number of coil/pole/phase is more than one arranged in different slots?

Basket winding Concentric winding Distributed winding Concentrated winding

Correct Answer: Distributed winding

5) Why external resistance is included in the rotor circuit at starting through 3 phase slipring induction motor starter?

To get high running torque To get high starting torque To reduce the load current To get increased speed at starting

Correct Answer: To get high starting torque

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