MCQOPTIONS
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MCQOPTIONS
This section includes 25 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Communications knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which among the following is the drawback of Pulse Position Modulation (PPM)? |
| A. | Synchronization is required between receiver and transmitter |
| B. | Synchronization is not required between receiver and transmitter |
| C. | Amplitude is constant |
| D. | Instantaneous power of PPM modulated signals is constant |
| Answer» B. Synchronization is not required between receiver and transmitter | |
| 2. |
A narrow band noise can exist in _________ |
| A. | AM only |
| B. | PCM only |
| C. | FM only |
| D. | AM and FM both |
| Answer» E. | |
| 3. |
The upper and lower sideband frequencies for 5KHz amplitude modulation with a 30KHz carrier frequency will be? |
| A. | 35KHz and 25KHz |
| B. | 34KHz and 24KHz |
| C. | 25KHz and 35KHz |
| D. | 0.35KHz and 0.25KHz |
| Answer» B. 34KHz and 24KHz | |
| 4. |
Calculate the Nyquist rate for the signal :x(t) = 12cos50pt + 7 cos75p t – 13 cos100pt |
| A. | 300 Hz |
| B. | 600 Hz |
| C. | 100 Hz |
| D. | 150 Hz |
| Answer» D. 150 Hz | |
| 5. |
Phase array radar can track many targets together. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
The advantage of using mechanical filter in filter system of sideband suppression is good attenuation characteristics. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Ground wave can be used for communication upto ________ |
| A. | 5 KHz |
| B. | 12 KHz |
| C. | 16 KHz |
| D. | 25 KHz |
| Answer» D. 25 KHz | |
| 8. |
In a Vidicon camera tube, both sides of the target plate have the coating of Sno2. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
Distance at which a sky wave is received back on earth ________ with angle of incidence. |
| A. | increases |
| B. | decreases |
| C. | can be increase or decrease |
| D. | can neither be increase or decrease |
| Answer» C. can be increase or decrease | |
| 10. |
For a human eye the minimum viewing angle of resolution should be ?⁄D where D is iris opening and ? is wavelength of light. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
In a Vidicon camera tube, the side of target plate facing the light has a coating of Sno2 (tin oxide) and the side facing electron gun has a coating of antimony trisulphide. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
Carrier frequency remains constant in cell communication. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
Autocorrelation function of white noise is ________ |
| A. | an impulse function |
| B. | a step function |
| C. | a constant |
| D. | a variable |
| Answer» D. a variable | |
| 14. |
Flyback switched mode is used in television because it can supply many voltage outputs. |
| A. | True |
| B. | False |
| Answer» C. | |
| 15. |
The equation 20sin?(108 t + 3 sin? 109 t) represents which modulation? |
| A. | AM |
| B. | DSB-SC |
| C. | PM |
| D. | FM |
| Answer» E. | |
| 16. |
Radiation resistance of an antenna is ________ |
| A. | a dc resistance |
| B. | an ac resistance |
| C. | a constant value |
| D. | neither ac nor dc resistance |
| Answer» C. a constant value | |
| 17. |
If AM transmitter has low level modulation then it has ________ |
| A. | high efficiency |
| B. | poor efficiency |
| C. | high modulating power |
| D. | high resistance towards noise |
| Answer» C. high modulating power | |
| 18. |
What do you understand by isotropic antenna? |
| A. | it radiates its power uniformly in all directions |
| B. | it radiates its power non-uniformly in all directions |
| C. | it radiates its power specifically in one direction only |
| D. | it does not radiate any power |
| Answer» B. it radiates its power non-uniformly in all directions | |
| 19. |
The amount of power and bandwidth necessary to be transmitted for a given amount of information are reduced in _________ |
| A. | Single Sideband Modulation |
| B. | Double Sideband Modulation |
| C. | Vestigial Sideband Modulation |
| D. | Amplitude Modulation |
| Answer» B. Double Sideband Modulation | |
| 20. |
A noise can be represented as superposition of spectral components. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
Waves of which frequency can penetrate the atmosphere? |
| A. | higher than 10 MHz |
| B. | higher than 20 MHz |
| C. | higher than 30 MHz |
| D. | higher than 100 MHz |
| Answer» D. higher than 100 MHz | |
| 22. |
Armstrong modulator can only generate FM signal. |
| A. | True |
| B. | False |
| Answer» C. | |
| 23. |
Flyback switched mode is used in television because it does not require a filter choke. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 24. |
In India, the subcarrier frequency for transmission of color difference signals in television is approximately ________ |
| A. | 10.47 MHZ |
| B. | 5.4 MHZ |
| C. | 7.67 MHZ |
| D. | 1.3 MHZ |
| Answer» E. | |
| 25. |
Carbon microphone has a bidirectional feature. |
| A. | True |
| B. | False |
| Answer» C. | |