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:-

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

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will stop.
 The motor will run in reverse direction.
 The motor will run much faster in the same direction.
 The motor will run at its normal speed in the same direction as before.

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