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Power Systems

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

 RMS
 peak value
 any of the above
 average

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Power Systems
A load centre is at an equidistant from the two thermal generating stations G1 and G2. The fuel cost characteristics of the generating stations are given by F1 = a + bP1 + cP²1 F2 = a + b P2 + 2cP²2 Where P1 and P2 are the generation in MW of G1 and G2, respectively. For most economic generation to meet 300 MW of load, P1 and P2 respectively, are

 200, 100
 100, 200
 150, 150
 175, 125

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Power Systems
A power system consists of 300 buses out of which 20 buses are generator buses, 25 buses are the ones with reactive power support buses and 15 buses are ones with fixed shunt capacitors. All the other buses are load buses. It is proposed to perform a load flow analysis for the system using Newton-Raphson Jacobian matrix is

 554×554
 553×553
 540×540
 555×555

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Power Systems
Transmission lines are transposed to reduce

 skin effect
 interference with neighbouring communication lines
 proximity effect
 ferranti effect

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Power Systems
If the breakdown voltage of the insulator is high, the thickness of the insulator is

None of these
 less
 high
 it does not related to breakdown voltage

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Power Systems
Which of the following transformer is used in sub station for operating a protective relay?

 auto transformer
 distribution transformer
 capacitor voltage transformer
All of these

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