Which one of the following is not the speed control technique of squirrel cage induction motor?

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2
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  1. frequency control
  2. stator voltage control
  3. stator resistance control
  4. rotor resistance control

Answer (Detailed Solution Below)

Option 4 : rotor resistance control
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  • The rotor conductors of the SCIM is short-circuited by end rings. The rotor connections are not brought out at the outside, it is short-circuited inside of the motor.
  • So that it is not possible to connect external resistances to rotor conductors, thus we don't have control over the speed of induction motor in squirrel cage type.
  • The speed of the induction motor can be controlled by the following methods:
  1. V/f control (or) frequency control
  2. Changing the number of stator poles
  3. Controlling supply voltage
  4. Changing winding resistance by adding rheostat in the stator circuit
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