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SarkariResultOutBMS · 2024

Previous Year Question

In which of the multi-terminal direct current (MTDC) systems, the reversal of power without using mechanical switch is possible?
  1. SeriesTDC system
  2. ParallelTDC system
  3. RadialTDC system
  4. MeshTDC system

Correct answer: A

Explanation

In a series-connected MTDC arrangement the same DC current flows through the terminals, and power reversal at a terminal can be achieved by reversing its DC voltage polarity while current direction is maintained. This permits electrical power reversal without a mechanical DC switching operation, as identified in option A.

Formula

Pdc=Vdc Id; reverse Vdc polarity with Id direction maintained → reverse power

Step-by-step solution

Power Reversal in MTDC explanatory diagram

Correct Answer

A — Series MTDC system

Concept and Reasoning

In a series-connected MTDC arrangement the same DC current flows through the terminals, and power reversal at a terminal can be achieved by reversing its DC voltage polarity while current direction is maintained. This permits electrical power reversal without a mechanical DC switching operation, as identified in option A.

Calculation / Key Relation

Pdc=Vdc Id

reverse Vdc polarity with Id direction maintained → reverse power

Exam Takeaway

Series MTDC power control is naturally associated with terminal voltage polarity.

Common Mistake

Do not assume all MTDC configurations reverse power in the same way.

Common mistake

Do not assume all MTDC configurations reverse power in the same way.

Exam tip

Series MTDC power control is naturally associated with terminal voltage polarity.

Quick method

Series MTDC power control is naturally associated with terminal voltage polarity.