With a D.C. generator which of the following regulation is preferred?
A. 100% regulation
B. Infinite regulation
C. 50% regulation
D. 1% regulation
Answer: Option D
Solution (By Examveda Team)
Voltage regulation in a D.C. generator refers to the change in terminal voltage from no-load to full-load, expressed as a percentage of the full-load voltage.A lower percentage of voltage regulation indicates better performance because it means the generator maintains a more constant voltage under varying load conditions.
Option A: 100% regulation
100% regulation would mean that the voltage drops to zero under full load, which is highly undesirable.
Option B: Infinite regulation
Infinite regulation implies a complete loss of voltage under load, which is not practical or acceptable.
Option C: 50% regulation
50% regulation indicates a significant drop in voltage under load, which is also not preferred as it would lead to poor performance.
Option D: 1% regulation
1% regulation is ideal as it indicates very little voltage drop under load, ensuring that the generator provides a stable voltage output.
Conclusion:
Among the given options, 1% regulation is preferred because it reflects the best performance in maintaining a constant voltage.
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In a D.C. generator, **low voltage regulation** is preferred.
### Explanation:
- **Voltage Regulation**: Voltage regulation in a D.C. generator is a measure of how much the terminal voltage changes from no-load to full-load conditions. It is expressed as a percentage and calculated using the formula:
[
ext{Voltage Regulation} = rac{V_{ ext{no-load}} - V_{ ext{full-load}}}{V_{ ext{full-load}}} imes 100%
]
Where:
- ( V_{ ext{no-load}} ) is the terminal voltage when no load is connected.
- ( V_{ ext{full-load}} ) is the terminal voltage when the generator is supplying its full load.
- **Preferred Regulation**: A generator with low voltage regulation has minimal voltage drop when the load increases. This is desirable because it means the generator can maintain a more consistent voltage, which is important for ensuring the stable operation of electrical equipment and systems.
- **Low Regulation (Preferred)**: If a D.C. generator has low voltage regulation, it means that the terminal voltage remains almost constant when the load changes. This stability in voltage is ideal for most applications as it ensures the reliable operation of connected devices.
- **High Regulation (Not Preferred)**: If a D.C. generator has high voltage regulation, the terminal voltage drops significantly under load, which can lead to poor performance of the connected equipment, such as dimming of lights or malfunctioning of motors.
### Conclusion:
For a D.C. generator, **low voltage regulation** is preferred because it ensures that the output voltage remains stable under varying load conditions, which is critical for the reliable operation of electrical systems.
The preferred regulation for a D.C. generator is D. 1% regulation.
Here's why:
* Voltage Regulation: It is the change in terminal voltage from no load to full load, expressed as a percentage of the full load voltage.
* Lower is Better: A lower voltage regulation indicates that the generator maintains a more constant output voltage, even as the load changes. This is essential for many applications, especially those sensitive to voltage fluctuations.
* 1% Regulation: This is a very low regulation value and signifies excellent voltage stability. It's often the desired target for many DC generator applications.
While options A, B, and C might seem like valid choices, they are not as desirable:
* 100% Regulation: This would mean the terminal voltage drops to zero at full load, which is clearly unacceptable.
* Infinite Regulation: This is essentially the same as 100% regulation, indicating a complete voltage drop at full load.
* 50% Regulation: While better than 100%, it's still a significant voltage drop and might not be suitable for many applications.
Therefore, a 1% regulation is the ideal choice for a D.C. generator, ensuring stable and reliable output voltage.