Power Systems
A 3-phase transmission line has its conductors at the corners of an equilateral triangle with side 3m. The diameter of each conductor is 1.63 cm. The inductance of the line per phase per km is

 1.043 mH
 1.093 mH
 1.232 mH
 1.182 mH

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Power Systems
In hydroelectric power plants

  operating cost is low and initial cost is high.
 both operating and initial cost are high.
 both operating and initial cost are low.
 operating cost is high and initial cost is low.

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Power Systems
Per unit of any quantity is defined as

 base value of quantity /actual value of quantity in same units
 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in different units
 actual value of quantity /base value of quantity in same units

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