friction and windage losses
magnetic losses
hysteresis and eddy current losses
copper losses
Answer is Right!
Answer is Wrong!
The correct answer is: A. friction and windage losses.
Friction and windage losses are caused by the mechanical friction of the rotating parts of the machine and the air resistance of the rotating parts. These losses are not present in transformers because transformers do not have any rotating parts.
Magnetic losses are caused by the eddy currents and hysteresis losses in the magnetic core of the machine. These losses are present in both rotating machines and transformers.
Copper losses are caused by the resistance of the windings of the machine. These losses are present in both rotating machines and transformers.
Here is a more detailed explanation of each option:
- Friction and windage losses are caused by the mechanical friction of the rotating parts of the machine and the air resistance of the rotating parts. These losses are not present in transformers because transformers do not have any rotating parts.
- Magnetic losses are caused by the eddy currents and hysteresis losses in the magnetic core of the machine. These losses are present in both rotating machines and transformers. Eddy currents are induced currents that flow in the magnetic core of the machine. These currents cause a loss of energy in the form of heat. Hysteresis losses are caused by the magnetic domains in the magnetic core of the machine constantly changing direction as the magnetic field changes. This also causes a loss of energy in the form of heat.
- Copper losses are caused by the resistance of the windings of the machine. These losses are present in both rotating machines and transformers. The resistance of the windings causes a voltage drop across the windings, which causes a loss of power in the form of heat.