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In a D.C. generator the critical resistance can be increased by
- a)increasing its field resistance
- b)decreasing its field resistance
- c)increasing its speed
- d)decreasing its speed
Correct answer is option 'C'. Can you explain this answer?
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In a D.C. generator the critical resistance can be increased bya)incre...
Increasing the critical resistance in a D.C. generator
Increasing the critical resistance in a D.C. generator can be achieved by increasing its speed.
Explanation:
What is critical resistance?
Critical resistance is the minimum external resistance required to be connected to the armature circuit of a D.C. generator to obtain maximum power output.
Effect of speed on critical resistance:
- The critical resistance of a D.C. generator is directly proportional to the speed of the generator.
- As the speed of the generator is increased, the critical resistance also increases.
- This is because at higher speeds, the back EMF of the generator increases, which in turn requires a higher external resistance in the armature circuit to maintain the same level of current.
Increasing speed vs. increasing field resistance:
- While increasing the field resistance can also affect the critical resistance to some extent, the primary factor that significantly influences the critical resistance is the speed of the generator.
- Increasing the field resistance mainly adjusts the voltage regulation of the generator, while increasing the speed directly impacts the critical resistance.
Therefore, in a D.C. generator, the critical resistance can be increased by increasing its speed rather than by changing its field resistance.
Increasing the critical resistance in a D.C. generator can be achieved by increasing its speed.
Explanation:
What is critical resistance?
Critical resistance is the minimum external resistance required to be connected to the armature circuit of a D.C. generator to obtain maximum power output.
Effect of speed on critical resistance:
- The critical resistance of a D.C. generator is directly proportional to the speed of the generator.
- As the speed of the generator is increased, the critical resistance also increases.
- This is because at higher speeds, the back EMF of the generator increases, which in turn requires a higher external resistance in the armature circuit to maintain the same level of current.
Increasing speed vs. increasing field resistance:
- While increasing the field resistance can also affect the critical resistance to some extent, the primary factor that significantly influences the critical resistance is the speed of the generator.
- Increasing the field resistance mainly adjusts the voltage regulation of the generator, while increasing the speed directly impacts the critical resistance.
Therefore, in a D.C. generator, the critical resistance can be increased by increasing its speed rather than by changing its field resistance.
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In a D.C. generator the critical resistance can be increased bya)increasing its field resistanceb)decreasing its field resistancec)increasing its speedd)decreasing its speedCorrect answer is option 'C'. Can you explain this answer?
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