POWER SYSTEMS QUIZ

Counter poise is used for

less surge impedance

more surge impedance

proper discharging of lighting surges

reduce losses

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A 3-phase breaker is rated at 2000 MVA, 33 kV, its making current will be

89.22 kVA.

49 kVA.

70 kVA.

35 kVA.

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If the percentage reactance of an element is 20 % and the full load current is 50 Amp, the short circuit current will be

300 Amp.

250 Amp.

350 Amp.

200 Amp.

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For accurate load flow calculations on large power systems, the best method is

Decoupled method

G-S method

All of these

N-R method

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Which statement is not correct for the transmission line parameter R, L, G and C

The line parameter R,L,G and C are uniformly distributed along the entire length of the line C.

At high frequencies at which most of communication system operate the internal inductance of the conductor is neglected.

G = I/R. R is the AC resistance per unit length of conductor C.

For each line, the conductors are characterized by σ c, μ c, εo = ε c and the homog

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The per unit impedance Z(pu) is given by

ZΩ* (MVA)b/((KV)²b *100)

ZΩ* (MVA)b/(KV)²b

ZΩ* (kVA)b/(KV)²b

ZΩ* (MVA)b*100/(KV)²b

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A power station supplies the peak load of 50 MW, 40 MW and 70 MW to three localities. The annual load factor is 0.50 p.u. and the diversity factor of the load at the station is 1.55 the maximum demand on the station and average load respectively will be

53 MW.

51.61 MW.

57.5 MW.

52 MW.

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In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is

0.075 pu.

0.200 pu.

3.000 pu.

0.125 pu.

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A generating station which has a high investment cost and low operating cost is usually operated as a

Minimum load station.

None of above.

Peak load station.

Base load station.

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If a fault occurs on any feeder, the fault current is

none of these.

equal to unsectional bus bar.

much higher than with unsectional bus bar.

much lower than with unsectional bus bar.

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