MCQs

If the conductor diameter decreases, the inductance of the line: Decreases Increases Remains the same Correct answer: 2. Increases

If the supply frequency increases, the skin effect: Decreases Increases Remains the same Correct answer: 2. Increases

The longer the cross arm: The lesser the string efficiency The more is the string efficiency The string efficiency remains unchanged Correct answer: 2. The more is the string efficiency

An insulator breakdown by puncture: Can be repaired easily Needs skilled craft for repairing Results in permanent damage Any of above Correct answer: 3. Results in permanent damage

A 100% string efficiency indicates: Potential difference of n-1 discs = P.D of nth disc Potential difference of nth + n-1 disc = P.D of all other discs Potential across each disc is the different Potential across each disc is the same Correct answer: 4. Potential across each disc is the same

Stringing chart is plotted between: Corona and voltage Sag and ice Sag, temperature and tension Voltage, length and cost of lines Correct answer: 3. Sag, temperature and tension

Increasing conductor spacing will _______ corona: Reduce Increase Have no impact on Correct answer: 1. Reduce

Stranded conductor has ________ corona as compared to solid conductor: More Less Same Correct answer: 1. More

In the stormy weather corona occurs at: More voltage Less voltage Same voltage as in normal Correct answer: 2. Less voltage Explanation: In a stormy weather, the number of ions are more than normal weather and the corona occurs at much less voltage