When would a machine operating as motor may go into regenerative braking mode?

Q.  A machine operating as motor may go into regenerative braking mode if its speed becomes
- Published on 21 Oct 15

a. Sufficiently high to make back emf greater than supply voltage
b. Sufficiently low to make back emf greater than supply voltage
c. Sufficiently high to make back emf half of the supply voltage
d. Sufficiently low to make back emf half of the supply voltage

ANSWER: Sufficiently high to make back emf greater than supply voltage

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