Direction: The following item consists of two statements, one labelled as ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the code given below:

Statement (I): Stability of a power system can be improved by using parallel transmission lines.

Statement (II): Two transmission lines in parallel will increase the impedance between sending end and receiving end compared to single line.

This question was previously asked in
ESE Electrical 2016 Paper 2: Official Paper
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  1. Both Statement I and Statement II are individually true and Statement II is the correct explanation of Statement I
  2. Both Statement I and Statement II are individually true but Statement II is not the correct explanation of Statement I
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true

Answer (Detailed Solution Below)

Option 3 : Statement I is true but Statement II is false
Free
ST 1: UPSC ESE (IES) Civil - Building Materials
20 Qs. 40 Marks 24 Mins

Detailed Solution

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Steady-state stability of a power system is

We can increase the steady-state stability by decreasing the reactance X.

In a double circuit line where two transmission lines are connected in parallel,  the reactance is less than the single line circuit and hence the stability can be improved.

Therefore, Statement I is true but Statement II is false.

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