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Power Systems

Power Systems
Breaking current is a ------------------ value?

 maximum
 RMS
 any of the above
 average

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Power Systems
In a 3-phase transmission line, each phase is supported by 3 insulated discs, maximum voltage of each disc is 20 kV. Find the operating voltage of the transmission line per phase if efficiency of string is 80.6%.

 52.84 kV
 48.36 kV
 83.76 kV
 20 kV

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Power Systems
Which one of the following relays has the capability of anticipating the possible major fault in a transformer?

 Over fluxing relay
 Over current relay
 Buchholz relay
 Differential relay

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Power Systems
In a two plant system, the load is connected to plant number 2. The loss coefficients are

 B11,B22,B12 are non zeros
 B11,B22 are non zero,B12 = 0
 B11,B12 are non zero ,B22 = 0
 B11 is non zero,B22 = B12 = 0

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Power Systems
A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator?

 10
 1000
 0.1
 0.001

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Power Systems
If the conductor diameter decreases, inductance of the line,

None of these
 remains unaffected
 decreases
 increases

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