5. If Ac = 20 and Ac min = 10, what is the percentage of modulation index. Select one: a. c. 50% b. d. 10% c. b. 40% d. a. 33.33% Spar e. e.your answer 8. A 400KHz wave is frequency modulated by 40000kHz carrier. For a frequency deviation of 0.4-2. Calculate the modulation index of the FM signal Select one: @ a. d. 0.1 b. e. your answer c. b. 10 Spark d. a. 100 e. c. 1000m 2. For this signal, X(t)= 5cos 30 t - Bsin' 20n + +10. The complex exponential Fourier series for Xion Select one: a. a. 14 b. d. 2.5 Spark C. c. O d. b. 10 3) Which of the given signals not periodic. Select one: O a. d) x[n) = 2 sin(3n) O b. b) X(t) = u(t) - 1/2 O c. e) None of them O d. c) X(t) = 4u(t) + 2 sin(3t) O e. a) x(t) = 4 cos(5rt) +u(t) 21. Refer to the figure below, if A = 6,The The efficiency is m(t)=2cos(2071) + x c(t)= cos(1000) Select one: a. b. 0.111 b. e.0.52 c. a. 0.333 Spar d. d.0.25 e. c. 0.222