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Power Systems

Power Systems
Fault calculations using computer are usually done by

 Y bus method
 Z bus method
 either 1 or 2
None of these

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Power Systems
Taking the density of water to be 1000 kg/m³, how much power would be developed by a hydro electric generator unit, assume 100% efficiency, with 1 m head and 1 m³/s discharge?

 9.81 kW
 19.60 kW
 4.45 kW
 2.90 kW

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Power Systems
The per unit impedance Z(pu) is given by

 ZΩ* (MVA)b*100/(KV)²b
 ZΩ* (kVA)b/(KV)²b
 ZΩ* (MVA)b/((KV)²b *100)
 ZΩ* (MVA)b/(KV)²b

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Power Systems
A 1-phase transmission line has an impedance (4 + 3j ) Ω. Find the power factor of the load for zero voltage regulation?

 0.6 lead
 0.8 lag
 0.6 lag
 0.8 lead

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Power Systems
Which of the following represents the transmission line positive sequence reactance

 Xm - Xs
 Xs - Xm
 Xs +2 Xm
 2Xs + Xm

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Power Systems
Find the number of insulator discs required in string insulator, if operating voltage is 220 kV and maximum voltage of each disc is 11 kV?

 10
 13
 21
 20

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