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Power Systems

Power Systems
Attenuation occurs due to

 resistance
 both 1 and 3
 inductance
 conductance

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Power Systems
For variable heads of near about but less than 30 m, which type of turbines is used hydro power plant

 None of above.
  Kaplan.
 Francis.
 Pelton.

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Power Systems
Surge impedance loading of a 3-phase, 400 kV transmission line is 400 Ω. The surge impedance loading is

 800 MW
 200 MW
 1600 MW
 400 MW

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 5 + j 7 A
 1 + j 4 A
 1 + j 2 A
 -2 - j 1 A

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Power Systems
In a 3-phase transmission line, each phase is supported by 3 insulated discs, maximum voltage of each disc is 20 kV. Find the operating voltage of the transmission line per phase if efficiency of string is 80.6%.

 83.76 kV
 20 kV
 48.36 kV
 52.84 kV

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Power Systems
Which of the following contributes to the Rankine cycle efficiency improvement in a thermal power plant

 Reheat of steam an intermediate stages.
 Use of steam for heating of boiler feed water.
 Use of high pressure.
All of these

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