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Power Systems

Power Systems
For flat voltage profile system, voltage regulation is

 0%
 100%
 any of the above
 50%

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Power Systems
The surge impedance of a 400 km long overhead transmission line is 420 Ω. For a 200 km length of the same line, the surge impedance will be

 210 Ω
 400 Ω
 420 Ω
 840 Ω

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Power Systems
What is the correct expression for the electrical power developed by

  ( 0.763 / 75 ) × WQHη.
 75 × 0.736 × WQHη.
 ( 75 / 0.736 ) × WQHη.
 ( 7 / 75 ) × WQHη.

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Power Systems
A steam power generation has an overall efficiency of 20 %. 0.6 Kg of coal is burnt per kWh of electrical energy generated. Calculated the calorific value of fuel

 7562 KCal / Kg.
 7000 KCal / Kg.
  7166.67 KCal / Kg.
 7268.45 KCal / Kg.

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Power Systems
Power system network has a total power of 5000 MW at 50 Hz supplying to the different consumers. Frequency is varying at 1.5% per change of 2% load. Assume R =0.004 Hz/MW. Find the steady state frequency deviation if a sudden loss of 200 MW occur due to tripping of one of the transmission line?

 0.48 Hz
 0.52 Hz
 50 Hz
 -0.52 Hz

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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?

 0.8 lead
 0.6 lead
 0.8 lag
 0.6 lag

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