The correct answer is: A. Large conductor area is required for same power transmission.
Constant voltage transmission is a method of power transmission in which the voltage is kept constant at the receiving end, regardless of the load. This is achieved by using a transformer to step up the voltage at the sending end and then step it down again at the receiving end.
The main disadvantage of constant voltage transmission is that it requires a large conductor area. This is because the current flowing through the conductor is proportional to the square of the voltage. So, if the voltage is doubled, the current will be four times as much. This means that the conductor must be able to carry four times as much current, which requires a larger conductor area.
The short-circuit current of the system is not affected by the method of transmission. The short-circuit current is the current that flows when there is a fault on the system. It is determined by the impedance of the system and the fault level. The impedance of the system is the resistance and reactance of the conductors, transformers, and other equipment on the system. The fault level is the amount of power that is available to flow in the event of a fault.
Therefore, the correct answer is: A. Large conductor area is required for same power transmission.