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Power Systems

Power Systems
The insulation of modern EHV is designed based on

 lightning voltage.
  switching voltage.
 RI.
 corona.

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Power Systems
A 3-phase transmission line operating at Vs = 400 kV and has ABCD parameters A= D = 0.8∠0°, B = 100∠90° Ω, C = 0.5*10-6∠90° â„§. Find the no load receiving end voltage?

 500 kV
 320 kv
 600 kV
 400 kV

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Power Systems
IF the time of operation of a relay for unity TMS is 10 sec then the time of operation for 0.5 TMS is

 20 sec.
  5 sec.
 10 sec.
 none of these.

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Power Systems
The inductance of single phase two wire line is given by

 0.4×10-7× ln(r'/d) H/m
 0.4×10-7× ln(d/r') H/m
 4×10-7× ln(d/r') H/m
 4×10-7× ln(r'/d) H/m

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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

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

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Power Systems
The draw back of NR method as compare to Gauss-Seidel method is/are?

 large number of iterations
 both 1 and 2
None of these
 large requirement of computer memory

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