251. The surge impedance of 50 miles long underground cable is 50 ohm. For a 25 miles length it will be ________ ohms

1. 1. 5.05

   
   
   

   2. 0.05

   
   
   

   3. 0.5

   
   
   

   4. 50

   
   
   

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   NA

   Correct Option: D

   NA

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252. A cable has following characteristics:
     L = 0.201 µH/m and C = 196.2 p/F/m.
     The velocity of wave propagation through the cable is ________ m/s

1. 1. 1592.4

   
   
   

   2. 15924

   
   
   

   3. 159.24

   
   
   

   4. 15.924

   
   
   

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   NA

   Correct Option: C

   NA

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253. A 60 Hz, 320 km lossless line has sending end voltage 1.0 p.u. The receiving end voltage on onload is _________ p.u.

1. 1. 1.088

   
   
   

   2. 1088

   
   
   

   3. 10.88

   
   
   

   4. 108.8

   
   
   

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   NA

   Correct Option: A

   NA

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254. An overhead line having a surge impedance of 400 Ω is connected in sereis with an underground cable having a surge impedance of 100 Ω. If a source of 50 kV travels from the line end towards the line-cable junctions, the value of the transmitted volt age wave at the junction is ________ kV

1. 1. 20

   
   
   

   2. 0.20

   
   
   

   3. 0.002

   
   
   

   4. 200

   
   
   

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   NA

   Correct Option: A

   NA

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255. The insulation resistance of a cable of length 10 km is 1 MΩ. For a length of 100 km of the same cable, the insulation resistance will be _______MΩ

1. 1. 1.01

   
   
   

   2. 10

   
   
   

   3. 1

   
   
   

   4. 0.1

   
   
   

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   NA

   Correct Option: D

   NA

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