Which of the following loss is occurred in Induction Motor but not occurred in Transformer?

Question

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Option C: Rotational (Mechanical) Losses

Explanation & Concepts:
C is correct because induction motors exhibit rotational (mechanical) losses due to rotor motion, which transformers do not have. Transformers operate purely on magnetic principles and do not have moving parts.

Working Principle: Induction motors function by creating a rotating magnetic field in the stator, causing the rotor to rotate. This movement results in mechanical losses due to friction and windage, which are absent in transformers that rely on electromagnetic induction without motion.

Key Points: Induction motors have moving parts which contribute to mechanical losses.; Transformers operate purely on a magnetic basis without physical movement.

Advantages: Efficient torque generation; Simple design without moving parts

Disadvantages: Mechanical wear and tear; Requires maintenance due to moving parts

Applications: Industrial drives; Pumping systems

Additional Info: Mechanical losses in induction motors can lead to decreased efficiency.. Option A is incorrect because both induction motors and transformers experience core losses stemming from magnetizing current.

Answer: C is correct — Induction motors have rotational losses due to the rotor's movement, which are not present in transformers.

Exam Tip: Remember that understanding the physical construction and operational principles helps distinguish between different electrical machines.

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Option A: Iron (Core) Losses

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Option B: Copper (Winding) Losses

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Option D: Stray Losses

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