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SarkariResultOutBMS · 2024

Previous Year Question

Choose the correct option. Statement-1: Ground impedance is negligible in DC transmission system. Statement-2: In DC transmission systems, mono-polar transmission is not possible.
  1. Statement-1 is True, but Statement-2 is False.
  2. Statement-1 is False, but Statement-2 is True.
  3. Both Statements are True.
  4. Both Statements are False.

Correct answer: D

Explanation

Ground or sea return in HVDC has finite impedance and associated electrode effects, so its impedance is not literally zero. Monopolar HVDC transmission is entirely possible and is a standard configuration. Therefore both statements are false, which is option D.

Formula

Monopole: one HV conductor + earth/metallic return where permitted

Step-by-step solution

Monopolar Operation and Earth Path explanatory diagram

Correct Answer

D — Both Statements are False.

Statement-wise Analysis

Statement 1: False

Statement 2: False

Concept and Reasoning

Ground or sea return in HVDC has finite impedance and associated electrode effects, so its impedance is not literally zero. Monopolar HVDC transmission is entirely possible and is a standard configuration. Therefore both statements are false, which is option D.

Calculation / Key Relation

Monopole: one HV conductor + earth/metallic return where permitted

Exam Takeaway

Monopolar HVDC is a standard link type.

Common Mistake

“Small” ground-path impedance is not the same as zero impedance.

Common mistake

“Small” ground-path impedance is not the same as zero impedance.

Exam tip

Monopolar HVDC is a standard link type.

Quick method

Monopolar HVDC is a standard link type.