M

Mr. Dubey • 53.50K Points
Coach 

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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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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