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What is the condition for maximum power transfer theorem in DC circuits?

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in Electric Drives by (99.8k points)
What is the condition for maximum power transfer theorem in DC circuits?

(a) RL=2Rth

(b) RL≠Rth

(c) RL≫Rth

(d) RL=Rth

This question was posed to me during an interview.

My doubt is from Regenerative Braking of DC Series Motors topic in section Braking of DC Motors & Induction Motors of Electric Drives

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Right choice is (d) RL=Rth

Best explanation: The condition for maximum power transfer theorem is load should be variable and RL=Rth. During maximum power transfer condition voltage across load becomes half of Thevenin voltage and efficiency becomes 50 %.

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