AC Three Phase Motor MCQ with Answers

AC Three Phase Motor MCQ with Answers

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

Answer is:

Short chorded winding

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

Answer is:

A stepped former is required

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

Answer is:

8 slots

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

Answer is:

Distributed winding

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

Answer is:

To get high starting torque

7
8
9
10
11
12
13