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Alternating Current vs Direct Current - Technical MCQs

Q1:

Why is ac current transfer more effective than dc current transfer over long distances?

A due to the height of power lines

B due to the use of ac generators

C due to step-up and step-down transformers reducing I2R losses

D due to very high voltages

ANS:C - due to step-up and step-down transformers reducing I2R losses

Because DC signals are pulsating.