A typical squirrel cage induction motor will have _______ starting torque with ______ starting current, when started direct-on-line.

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NHPC JE Electrical 5 April 2022 (Shift 1) Official Paper
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  1. 200%; 300%
  2. 600%; 130%
  3. 300%; 200%
  4. 130%; 600%

Answer (Detailed Solution Below)

Option 4 : 130%; 600%
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Starting Performance of squirrel cage Motor:

  • For constant speed service where the starting duty is comparatively light and infrequent, the squirrel cage IM is best suited.
  • Starting performance of the cage motor varies considerably with its design.
  • A typical squirrel cage Induction motor would have 130% starting torque and 600% starting current when started Direct-on-line.
  • A high starting current causes a heavy drop in line voltage and adversely affects the operation of other motors connected on-line. For this reason, it may be required to restrict the starting current of motors.
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