Question

A carrier frequency of $10kV$ at $1MHz$ is amplitude modulated by a $1kHz$ signal of $6kV$ peak voltage. When the modulation pattern is observed on a calibrated CRO, the peak to peak value of voltage indicated by the CRO will be (in $kV$)

• A. $16$
• B. $32$
• C. $864$
• D. $84$

Answer 1

Answer: (B)

$32$

Voltage observed on CRO of modulated signal (peak to peak)
$=$ (carrier voltage + modulating signal voltage) $\times 2$
$=(10+6)\times 2=16\times 2=32kV$