SarkariResultOutBMS · 2024

Previous Year Question

Choose the correct option. Statement-1: Voltage instability is more severe at the voltage setting terminal (VST) compared to other terminals irrespective of whether it is rectifier or inverter in HVDC system. Statement-2: Constant AC voltage control at VST improves voltage stability at all terminal including VST without any coordination.

Both statements are True
Statement-1 is True, but Statement-2 is False
Statement-1 is False, but Statement-2 is True
Both statements are False

Correct answer: B

Explanation

Voltage instability in an MTDC/HVDC network is strongly influenced by which terminal regulates DC voltage and by whether that terminal is operating as rectifier or inverter; it is not universally “more severe at the VST irrespective of mode.” The correct truth combination in the source is option B.

Formula

DC-network voltage stability depends on converter control mode and network operating point

Step-by-step solution

Voltage-Setting Terminal explanatory diagram

Correct Answer

B — Statement-1 is True, but Statement-2 is False

Concept and Reasoning

Calculation / Key Relation

DC-network voltage stability depends on converter control mode and network operating point

Exam Takeaway

Statements containing “irrespective of rectifier/inverter operation” deserve careful scrutiny.

Common Mistake

Do not generalize voltage-stability behavior without considering converter operating mode and control characteristic.

Common mistake

Do not generalize voltage-stability behavior without considering converter operating mode and control characteristic.

Exam tip

Statements containing “irrespective of rectifier/inverter operation” deserve careful scrutiny.

Quick method

Statements containing “irrespective of rectifier/inverter operation” deserve careful scrutiny.