Electrical Engineering XYZ MCQs
In a transformer which of the following losses are zero:
- Copper loss
- Rotational loss
- Iron loss
- All of the above
Correct answer: 2. Rotational loss
Explanation: Transformers are static devices, meaning they have no moving parts. Copper losses in transformers occur due to the resistance in the winding when current flows through them. Iron losses (or core losses), consisting of hysteresis and eddy current losses, occur due to the alternating nature of the magnetic field in the core. Rotational losses, on the other hand, are associated with machines that have rotating parts, such as motors and generators. Since a transformer does not involve any mechanical rotation, it does not experience rotational losses. Hence, rotational losses in a transformer are indeed zero.