The gauss siedel load flow method has following disadvantages, tick the incorrect statement

High volatage DC (HVDC) transmission is mainly used for

A. Bulk power transmission over very long distance.

B. Interconnecting two systems with the same nominal frequency.

C. Eliminating reactive power requirement in the operation.

D. Minimizing harmonic at the converter stations.

Keeping in view the cost and overall effectiveness the following circuit breaker is besy suited for the capacitor bank switching

The insulation strength of an EHV transmission line is mainly governed by

A. Load Power Factor
B. Switching Over Voltage
C. Harmonics
D. Corona

Answer : B. Switching Over Voltage

The insulation resistance of a 20 km long underground cable is 8 mega ohm, insulation resisatance for similar cable of 10 km is

For thiven base voltage and base volt amperes, the per unit impedance value of this element is x. The per unit impedance value of this element when the volatage and volt amperes bases are both doubled is

The surge impedence of a 400 km overhead transmission line is 400 ohms. For a 200 km length of the same line, the surge impedance will be