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Alternating Current vs Direct Current - Technical MCQs

Q1:

What is the waveform period difference between the 60 Hz electricity used in this country and the 50 Hz used in Europe?

A 3 ms

B 16 ms

C 4 ms

D 20 ms

ANS:A - 3 ms

T=1/f .
= 1/50+1/60.
= 0.02+0.0166
= 0.03.

Mean 3*10^3 3mili amps.