Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

 1, 3 and 4.
 2, 3 and 4.
  1, 2 and 3.
 2 and 4.

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Electrical Machines
The coil spam

 can never be equal to pole pitch.
  may or may not be exactly equal to people pitch.
 must be exactly equal to people pitch.
 none of above.

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