11. The surge impedance of a 400 km long overhead transmission line is 400 ohms. For a 200 km length of the same line, the impedance will be _______ Ω

1. 1. 0.4

   
   
   

   2. 400

   
   
   

   3. 0.04

   
   
   

   4. 40

   
   
   

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   NA

   Correct Option: B

   NA

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12. If a line is 100% series compensated, it may result into series resonance at power frequency of _______ Hz

1. 1. 5.0

   
   
   

   2. 0.5

   
   
   

   3. 50

   
   
   

   4. 0.05

   
   
   

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   NA

   Correct Option: C

   NA

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13. The concept of an electrically short, medium, and long line is primarily based on the

1. 1. nominal voltage of the line

   
   
   

   2. physical length of the line

   
   
   

   3. wavelength of the line

   
   
   

   4. power transmitted over the line

   
   
   

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   Short line less than 80 kms
   Medium line 80 to 160 kms
   Long line 160 kms.

   Correct Option: B

   Short line less than 80 kms
   Medium line 80 to 160 kms
   Long line 160 kms.

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14. A dc distribution system is shown in Figure with load currents as marde. The two ends of the feeder are fed by voltage sources such that VP – VQ = 3V. The value of the voltage VP for a minimum voltage of 220 V at any point along the feeder is _____ V
    

1. 1. 220.0

   
   
   

   2. 0.020

   
   
   

   3. 22.0

   
   
   

   4. 2.02

   
   
   

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   NA

   Correct Option: A

   NA

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15. The per cent age resistance and per cent age react ance of a 10 kVA, 400 V/200 V, 3-phase transformer are 2% and 10% respectively. If the const ant losses in t he machine are 1%, the maximum possible percentage efficiency of the transformer is __________

1. 1. 96.85

   
   
   

   2. 9.685

   
   
   

   3. 968.5

   
   
   

   4. 0.9685

   
   
   

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   NA

   Correct Option: A

   NA

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