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Power Systems

Power Systems
Normally Z bus matrix is a

 full matrix
 sparse matrix
 unit matrix
 null matrix

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Power Systems
For transmission line which one of the following relation is true?

 AD - BC = 0
 AD - BC = -1
 AD + BC = 0
 AD - BC = 1

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Power Systems
If we increase the spacing between the phase conductors, the line capacitance

None of these
 increases
 remains unaffected
 decreases

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Power Systems
Which of the following matrix is used for load flow studies?

 Z bus matrix
 null matrix
 Unit matrix
 Y bus matrix

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Power Systems
The neutral of 10 MVA, 11 kV alternator is earthed through a resistance of 5 ohms. The fault ready is set to operate at 0.75 A. The current transformers have a ratio of 1000/5. What is the percentage of the alternator winding is protected?

 11.8%
 85%
 88.2%
 15%

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Power Systems
In case of failure of prime mover of the generator, which type of relay is used?

 impedance relay
 distance relays
 reverse power relay
 offset mho relay

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