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Power Systems

Power Systems
If the load is short circuited, then reflection coefficient of voltage is

 -2
 1
 0
 -1

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Power Systems
Which of the following is/are the methods of improving transient stability?

 Dynamic breaking
All of these
 Fast acting excitation control
 Fast acting governing system

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Power Systems
The charging reactance of 50 km transmission line is 1500 Ω. What is the charging reactance for 100 km length of line?

 1000 Ω
 1500 Ω
 3000 Ω
 750 Ω

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Power Systems
Highest pressure generating pump inside the thermal plant is

 high pressure heater
All of these
 low pressure heater
 boiler feed pump

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Power Systems
Lightning arresters are used to protect electrical equipment against

  over voltages due to indirect lightning stroke.
 power frequency of over voltages.
 over currents due to lightning stroke.
 direct strokes of lightning.

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Power Systems
Counter poise is used for

 more surge impedance
 proper discharging of lighting surges
 less surge impedance
 reduce losses

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