Recent questions tagged voltages

1 answer 14 views

Thyristor can be protected from over voltages by using

asked May 8, 2018 in Power Electronics by Shimroz123
1 answer 22 views

A minimum clearance of 6.3 m to ground is required for overhead lines when operating voltages are :  (A) less than 66 kV (B) lie between 66 kV and 110 kV (C) more than 165 kV (D) lie between 110 kV and 165 kV

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 32 views

The voltages across various discs of suspension insulators having identical discs are different due to:  (A) Surface leakage currents  (B) Series capacitance of lines  (C) Shunt capacitance to ground  (D) Series and shunt capacitances

asked Apr 29, 2018 in Electric Power Transmission by Shimroz123
2 answers 95 views

The sending end and receiving end voltages of a three-phase transmission line are 10 kV/ph and 9.5 kV/ph, respectively. If the resistance drop is 150 V/ph and receiving end power factor is 0.8, the sending end power factor is (A) 0.745 lagging (B) 0.775 lagging (C) 0.8 lagging (D) 0.85 lagging

asked Apr 28, 2018 in Power system by Shimroz123
2 answers 58 views

Why transmission voltages are high?

asked Dec 16, 2017 in Extra high voltage transmission by Quiz
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