For Induction motors : (A) In regenerative breaking the synchronous speed is greater than rotor speed...

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For Induction motors : (A) In regenerative breaking the synchronous speed is greater than rotor speed...

59) For Induction motors :

(A) In regenerative breaking the synchronous speed is greater than rotor speed
(B) The slip is Negative in regenerative breaking
(C) In regenerative breaking rotor speed is greater than synchronous speed
(D) The slip is positive in regenerative breaking

Choose the correct answer from the options given below :

(1) (A) and (B) only
(2) (A) and (D) only
(3) (B) and (C) only
(4) (C) and (D) only

Answer: C

Evaluating the Statements:

(A) In regenerative braking the synchronous speed is greater than rotor speed (

 $N_{s} > N_{r}$

Incorrect. This is for normal driving, not braking.

(B) The slip is Negative in regenerative braking:
Correct. As we saw above, when

 $N_{r} > N_{s}$

, the math results in a negative slip.

(C) In regenerative braking rotor speed is greater than synchronous speed (

 $N_{r} > N_{s}$

Correct. This is the physical requirement for regeneration to happen.

(D) The slip is positive in regenerative braking:
Incorrect. Positive slip happens during normal driving.

Conclusion:

Statements (B) and (C) are correct.

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