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Power Systems

Power Systems
If all the sequence voltages at the fault point in a power system are equal, then the fault point is a

 LG
 LLG
 LLL
 LL

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Power Systems
Mho relay is used for protection of

  medium lines.
  short lines.
  none of these.
  long lines.

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Power Systems
The Y bus matrix of 100 bus interconnected system is 90% sparse. Hence the number of transmission lines in the system must be

 900
 500
 250
 450

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Power Systems
The inductance of single phase two wire line is given by

 4×10-7× ln(r'/d) H/m
 0.4×10-7× ln(d/r') H/m
 0.4×10-7× ln(r'/d) H/m
 4×10-7× ln(d/r') H/m

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Power Systems
Lightning arresters are made up of which material?

 silver
 copper
 any of the above
 silicon oxide

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Power Systems
Based on the discharge, Kaplan turbine will discharge

 1000 lpm
 >10000 lpm

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