The most practical way of obtaining a uniform distribution of series connected SCRs is toa)connect a resistor of value R in series with each of the series connected SCRsb)connect a resistor of value R in parallel with each of the series connected SCRsc)connect a resistor of value R in series with one of the series connected SCRsd)connect a resistor of value R in parallel with one of the series connected SCRsCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Explanation:
In series connected Silicon Controlled Rectifiers (SCRs), it is important to ensure a uniform distribution of voltage across the SCRs. This is necessary to prevent one SCR from taking a higher voltage than the others, which can lead to uneven operation and possible failure.

Option B: Connect a resistor of value R in parallel with each of the series connected SCRs.

Reasoning:
By connecting a resistor in parallel with each of the series connected SCRs, we can ensure a uniform distribution of voltage across the SCRs. This is because the resistor will provide a parallel path for current flow, allowing each SCR to share the voltage equally.

When the SCRs are connected in series, the total voltage across them is divided equally among them. However, due to manufacturing tolerances and other factors, the forward voltage drop across each SCR may not be exactly the same. This can result in unequal voltage distribution.

By connecting a resistor in parallel with each SCR, the voltage drop across the resistor will be proportional to the current flowing through it. This will help equalize the voltage across the SCRs by diverting extra voltage across the SCR with a lower forward voltage drop.

Advantages of connecting a resistor in parallel:
1. Uniform voltage distribution: The resistor helps equalize the voltage across the SCRs, ensuring their uniform operation.
2. Protection against overvoltage: In case one SCR fails or conducts excessive current, the resistor can limit the voltage across it, protecting the other SCRs in the series.
3. Cost-effective solution: Connecting a resistor in parallel is a simple and cost-effective way to achieve uniform voltage distribution in series connected SCRs.

Conclusion:
Connecting a resistor of value R in parallel with each of the series connected SCRs is the most practical way to obtain a uniform distribution of voltage across the SCRs. This approach ensures proper operation and reliability of the series connected SCRs.

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