Q. Electrical braking of any variety becomes less effective as

  • (A) speed increases
  • (B) speed decreases
  • (C) independent of speed
  • (D) depends on supply voltage
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✅ Correct Answer: (B) speed decreases
Explanation: braking torque of the dc machine is given by n (ka2/rb). here, braking torque is directly proportional to the speed of the motor, so as the speed decreases the efficiency of electrical brakes which is dependent on braking torque decreases.

Published by Mr. Dubey ⭐ 104.84K Points at 17-Sep-2023 11:28 am in Electrical Drives and Controls (EDC)

Explanation by: Mr. Dubey
braking torque of the dc machine is given by n (ka2/rb). here, braking torque is directly proportional to the speed of the motor, so as the speed decreases the efficiency of electrical brakes which is dependent on braking torque decreases.

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