Which of the following statements is/are true? Due to corona

A. interference increases
B. power loss increases
C. charging current increases
D. all of the above

Answer: D. all of the above

Explanation:
The phenomenon of ionization of surrounding air around the conductor due to which luminous glow with hissing noise is rise is known as the corona effect. 

Air acts as a dielectric medium between the transmission lines. In other words, it is an insulator between the current-carrying conductors.

Corona is the electrical discharge of atmospheric air. 

If the operating voltage is more than the dielectric strength of atmospheric air, air molecules are ionized and start accumulating on the conductor surfaces producing corona.
The effects of corona are
1. Interference increases
2. Power loss increases
3. Charging current increases

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