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Power Systems

Power Systems
Find the propagation constant, if impedance is 10Ω and admittance is 10 â„§?

 5
 10
 100
 1

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Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

 4.28 pu
 7.25 pu
 3.75 pu
 2.5 pu

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, the symmetrical breaking capacity is 2000 MVA, 3 secs. Then the making capacity is

 5200 MVA.
  5000 MVA.
  5100 MVA.
 5500 MVA.

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Power Systems
For a lossy transmission line, the characteristic impedance does not depend on

 The conductivity of conductors.
 The permittivity of the dielectric separating the conductor.
 The operating frequency of the line.
 The load terminating the line.

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Power Systems
Surge impedance loading can be increased by

 both 1 and 2
 increasing of voltage level
 increasing of inductance value
 increasing of capacitance value

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Power Systems
If R = 84 ohm/Km, G = 10-6 mho/Km, H = 0.01 H/Km, C = 0.061 μ F/Km and frequency = 1000 Hz, then what is the value of propagation constant of the transmission line

 None of them.
 0.018 per Km.
 0.01 + j 0.02 per Km.
 0.09 + j 0.018 per Km.

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