Download Aptitude Crack
img not found img not found

Alternating Current vs Direct Current - Technical MCQs

Q1:

If a voltmeter measures a sine wave as 500 mV, what would be its average value?

A 159.0 mV

B 318.5 mV

C 353.5 mV

D 451.0 mV

ANS:D - 451.0 mV

Some AC Voltage Conversion: Peak to rms: multiply peak by 0.707. Peak to average: multiply peak by 0.637. Rms to peak: multiply rms by 1.414. Rms to average: multiply rms by 0.9. Average to rms: multiply avg by 1.111. Average to peak: multiply avg by 1.567. Mostly voltmeter shows rms value. So, Vav = 0.9*Vrms = 0.9*500. = 450mV ~ [D] 451 mV.