16. For effective use of a counterpoise wire

1. 1. its leakage resistance should be greater than the surge impedance

   
   
   

   2. its leakage resistance should be less than the surge impedance

   
   
   

   3. its leakage resistance should be equal to the surge impedance

   
   
   

   4. two resistance may have any relation

   
   
   

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1. View Hint View Answer Discuss in Forum

   If surge impedance will be smaller than the leakage resistance, then positive reflections will occur and the potential of the tower will be raised which will result in flash over of the insulator discs and finally a line-to-ground fault will occur.

   Correct Option: B

   If surge impedance will be smaller than the leakage resistance, then positive reflections will occur and the potential of the tower will be raised which will result in flash over of the insulator discs and finally a line-to-ground fault will occur.

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17. The velocity of travelling wave through a cable at relative permittivity 9 is

1. 1. 9 × 10⁸ metre/sec

   
   
   

   2. 3 × 10⁸ metre/sec

   
   
   

   3. 10⁸ metre/sec

   
   
   

   4. 2 × 10⁸ metre/sec

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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18. The main criterion for selection of the size of a distribution for a radial distribution system is

1. 1. voltage drop

   
   
   

   2. corona loss

   
   
   

   3. temperature rise

   
   
   

   4. capital cost

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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19. Buses for load flow studies are classified as (i) the load bus (ii) the generator bus (iii) the slace bus The correct combination of the pair of quantities specified having their usual meaning for different buses is
    Load Bus Generator Slace bus

1. 1. P, |V| P, Q P, δ

   
   
   

   2. P, Q P, |V| |V| ,δ

   
   
   

   3. |V|, Q P, δ P, Q

   
   
   

   4. P, δ Q, |V Q, δ

   
   
   

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1. View Hint View Answer Discuss in Forum

   Load bus = P, Q
   Generator bus = P, |V|
   Slack bus = |V|, δ

   Correct Option: B

   Load bus = P, Q
   Generator bus = P, |V|
   Slack bus = |V|, δ

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20. In a synchronous machine, in case the axis of field flux is in line with the armature flux, the machine is working

1. 1. as synchronous moter

   
   
   

   2. as synchronous generator

   
   
   

   3. as floating machine

   
   
   

   4. the machine will not work

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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