QUESTION 20 Q20. An AM wave has unmodulated carrier wave peak amplitude of 3V. When modulated its peak amplitude varies from 4.15V to 1.85V. What is the modulation depth? (a) m = 0.63 a. O b. c. O d. O e. (b) m = 1.0 (c) m = 0.838 (d) m = 3.38 (e) m =0.383 QUESTION 21 Q21. An FM transmitter has a rated system deviation of 50 kHz for a maximum level of modulating signal of 10 V. Determine the frequency of deviation produced by a signal with a peak amplitude of 6.5 V? (a) 50 kHz a. O b. c. Od. O e. (b) 38.5 kHz (c) 42.5 kHz (d) 65 kHz (e) 32.5 kHz QUESTION 22 Q22. A sinusoidal signal of frequency 7.5 kHz amplitude modulates a carrier of peak amplitude 15 V and frequency 150 kHz with 35 % modulation depth. What is the peak amplitude of the AM wave? (a) 15.25 V (b) 10.25 V (c) 5.25 V (d) 2.25 V (e) 0.25 V Oa. Ob. O c. Od. O e.