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Alternating Current and Voltage - Technical MCQs

Q1:

The effective value of a sine wave is equal to

A 0.707 of peak voltage

B 0.636 of peak voltage

C sin 45° of peak voltage

D both 0.707 of peak voltage and sin 45° of peak voltage

ANS:D - both 0.707 of peak voltage and sin 45° of peak voltage

Effective value mens sine wave RMS value.
So RMS VALUE =vm/root2 =Vm*1/root2 =Vm*0.1707,
And Sin 45 =1/root2 so 0.7.7*Vm.