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Stray/Rotational Losses

Stray losses in a DC motor are sum of:
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Answer & Explanation
Correct AnswerB. Core and Mechanical losses

Quick Explanation

In the conventional DC-machine loss grouping used in this question, stray/rotational losses comprise the iron (core) loss plus mechanical losses such as friction and windage. Hence option B is correct.

Formula / Key Relation

Rotational (stray) losses ≈ core loss + mechanical loss
Stray/Rotational Losses explanatory diagram

Detailed Explanation

Correct Answer

B — Core and Mechanical losses

Explanation

In the conventional DC-machine loss grouping used in this question, stray/rotational losses comprise the iron (core) loss plus mechanical losses such as friction and windage. Hence option B is correct.

Key Concept

Stray/Rotational Losses

Formula

Rotational (stray) losses ≈ core loss + mechanical loss

Exam Point

Rotational loss = iron/core + friction & windage.

Quick Trick

Rotational loss = iron/core + friction & windage.

Exam Tip

Rotational loss = iron/core + friction & windage.

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