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Consider the following statements In a dc machine, iron loss occurs in
1. armature core
2. yoke
3. pole cores
4. pole shoes
Which of these statements are correct
1. armature core
2. yoke
3. pole cores
4. pole shoes
Which of these statements are correct
- a)1 and 2
- b)1 and 4
- c)1 and 3
- d)2 and 3
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
Consider the following statements In a dc machine, iron loss occurs in...
Understanding Iron Loss in DC Machines
Iron loss, also known as core loss, in a DC machine primarily occurs due to the magnetic properties of iron components. It is crucial to identify where these losses take place to enhance efficiency and performance.
Components Where Iron Loss Occurs
- Armature Core: The armature core is subjected to alternating magnetic fields during operation, leading to hysteresis and eddy current losses. Therefore, iron loss occurs in the armature core.
- Yoke: The yoke serves as a magnetic return path. While it is made of iron, it typically does not undergo significant changes in magnetization and thus does not contribute significantly to iron losses.
- Pole Cores: Similar to the armature core, pole cores also experience magnetic flux changes. However, their contribution to iron loss is minimal compared to the armature core due to fixed magnetization.
- Pole Shoes: Pole shoes are designed to provide a larger surface area for the magnetic field and aid in reducing reluctance. They can experience iron losses, but they are more efficient in reducing losses compared to the armature core.
Correct Answer Explanation
The correct option is B (1 and 4). This is because:
- The armature core (1) indeed experiences iron losses due to its dynamic magnetic field interactions.
- Pole shoes (4) also contribute to iron losses as they are integral to the magnetic circuit and experience some level of flux variation.
Summary
In summary, iron losses in a DC machine occur primarily in the armature core and to some extent in the pole shoes. The yoke and pole cores do not significantly contribute to these losses, making option B the correct choice.
Iron loss, also known as core loss, in a DC machine primarily occurs due to the magnetic properties of iron components. It is crucial to identify where these losses take place to enhance efficiency and performance.
Components Where Iron Loss Occurs
- Armature Core: The armature core is subjected to alternating magnetic fields during operation, leading to hysteresis and eddy current losses. Therefore, iron loss occurs in the armature core.
- Yoke: The yoke serves as a magnetic return path. While it is made of iron, it typically does not undergo significant changes in magnetization and thus does not contribute significantly to iron losses.
- Pole Cores: Similar to the armature core, pole cores also experience magnetic flux changes. However, their contribution to iron loss is minimal compared to the armature core due to fixed magnetization.
- Pole Shoes: Pole shoes are designed to provide a larger surface area for the magnetic field and aid in reducing reluctance. They can experience iron losses, but they are more efficient in reducing losses compared to the armature core.
Correct Answer Explanation
The correct option is B (1 and 4). This is because:
- The armature core (1) indeed experiences iron losses due to its dynamic magnetic field interactions.
- Pole shoes (4) also contribute to iron losses as they are integral to the magnetic circuit and experience some level of flux variation.
Summary
In summary, iron losses in a DC machine occur primarily in the armature core and to some extent in the pole shoes. The yoke and pole cores do not significantly contribute to these losses, making option B the correct choice.
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Consider the following statements In a dc machine, iron loss occurs in1. armature core2. yoke3. pole cores4. pole shoesWhich of these statements are correcta)1 and 2b)1 and 4c)1 and 3d)2 and 3Correct answer is option 'B'. Can you explain this answer?
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