31. The input a coherent detector is DSB-SC signal plus noise. The noise at the detector output is
32. The Foster-Seeley discriminator responds to the input FM signal's
33. The auto-correlation function of an energy signal has
34. The output of a transmitter is 100 kW with carrier unmodulated and 132 kW when carrier is modulated by a sinusoidal wave. Then the depth of modulation is
35. Decoding, storage and interpretation are the process steps of . . . . . . . .
36. Match List-I with List-II and select the correct answer using the options given below:
List-I
List-II
a. IF Noise
1. Ganged tunning
b. Image frequency
2. Spurious response
c. Station selector
3. Leaky filter capacitor
d. Excessive hum
4. Mixer stage
| List-I | List-II |
| a. IF Noise | 1. Ganged tunning |
| b. Image frequency | 2. Spurious response |
| c. Station selector | 3. Leaky filter capacitor |
| d. Excessive hum | 4. Mixer stage |
37. A product modulator yields
38. 4(1 + 2cos200πt)cos400πt, for demodulation we are using which technique . . . . . . . .
39. A carrier voltage is simultaneously modulated by two sine waves causing modulation indices of 0.4 and 0.3. The overall modulation index is
40. A random variable X has $$\overline {\text{X}} $$ = 0 & $$\sigma _{\text{x}}^2$$ = 1. Form a new random variable Y = 2X + 1. The values of $$\overline {\text{Y}} $$ & $$\sigma _{\text{y}}^2$$ are:
Read More Section(Communication Systems)
Each Section contains maximum 100 MCQs question on Communication Systems. To get more questions visit other sections.