MCQOPTIONS
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MCQOPTIONS
This section includes 14 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. |
What do you understand by high level AM? |
| A. | Output power is low |
| B. | Modulation is done at high power of carrier and modulating signal |
| C. | No need to boost the carrier and modulating signal |
| D. | Modulation is done at low power of carrier and modulating signal |
| Answer» C. No need to boost the carrier and modulating signal | |
| 2. |
What do you understand by low level AM? |
| A. | Output power is low |
| B. | Modulation is done at high power of carrier and modulating signal |
| C. | Collector Modulation Method is low level AM |
| D. | Output power is high |
| Answer» B. Modulation is done at high power of carrier and modulating signal | |
| 3. |
Square Law modulators ________ |
| A. | used for amplitude modulation |
| B. | have non linear current-voltage characteristics |
| C. | have non linear current-voltage characteristics as well as used for Amplitude Modulation |
| D. | used for frequency modulation |
| Answer» D. used for frequency modulation | |
| 4. |
Which devices did we use for AM Demodulation? |
| A. | Envelope detector and Square law demodulator |
| B. | PLL detector and Foster-Seeley discriminator |
| C. | Ratio detector and Slope detector |
| D. | Only quadrature detector |
| Answer» B. PLL detector and Foster-Seeley discriminator | |
| 5. |
Why the Synchronous detection of AM signals is considered as a disadvantage? |
| A. | Needs additional system for synchronization of carrier |
| B. | Receiver is available at cheap prices |
| C. | Needs less number of system as estimated for generation of carrier |
| D. | Receiver is not complex |
| Answer» B. Receiver is available at cheap prices | |
| 6. |
Envelope of AM wave has the same shape as the message of baseband signal. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
What_do_you_understand_by_high_level_AM?$ |
| A. | Output power is low |
| B. | Modulation is done at high power of carrier and modulating signal |
| C. | No need to boost the carrier and modulating signal |
| D. | Modulation is done at low power of carrier and modulating signal |
| Answer» C. No need to boost the carrier and modulating signal | |
| 8. |
Square Law modulators _______? |
| A. | used for amplitude modulation |
| B. | have non linear current-voltage characteristics |
| C. | have non linear current-voltage characteristics as well as used for Amplitude Modulation |
| D. | used for frequency modulation |
| Answer» D. used for frequency modulation | |
| 9. |
Which devices we used for AM Demodulation? |
| A. | Envelope detector and Square law demodulator |
| B. | PLL detector and Foster-Seeley discriminator |
| C. | Ratio detector and Slope detector |
| D. | Only quadrature detector |
| Answer» B. PLL detector and Foster-Seeley discriminator | |
| 10. |
Synchronous detection of AM signal is considered as a disadvantage. Why? |
| A. | Needs additional system for synchronization of carrier |
| B. | Receiver is available at cheap prices |
| C. | Needs less number of system as estimated for generation of carrier |
| D. | Receiver is not complex |
| Answer» B. Receiver is available at cheap prices | |
| 11. |
When aliasing takes place? |
| A. | Sampling signals less than Nyquist Rate |
| B. | Sampling signals more than Nyquist Rate |
| C. | Sampling signals equal to Nyquist Rate |
| D. | Sampling signals at a rate which is twice of Nyquist Rate |
| Answer» B. Sampling signals more than Nyquist Rate | |
| 12. |
In amplitude modulation frequency and phase of carrier ________ |
| A. | varies simultaneously |
| B. | varies alternately |
| C. | initially varies but become same after sometime |
| D. | remains constant |
| Answer» E. | |
| 13. |
Frequency components of an AM wave are? |
| A. | Carrier frequency (ω<sub>c</sub>) with amplitude A |
| B. | Lower side band (ω<sub>c</sub> + ω<sub>m</sub>) having amplitude <sup>mA</sup>⁄<sub>2</sub> |
| C. | Upper side band (ω<sub>c</sub> – ω<sub>m</sub>) having amplitude <sup>mA</sup>⁄<sub>2</sub> |
| D. | Carrier frequency (ω<sub>c</sub>/2) with amplitude A |
| Answer» B. Lower side band (‚âà√¨‚àö¬¢<sub>c</sub> + ‚âà√¨‚àö¬¢<sub>m</sub>) having amplitude <sup>mA</sup>‚Äö√Ñ√∂‚àö√ñ‚àö√´<sub>2</sub> | |
| 14. |
What is Amplitude Modulation? |
| A. | Change in amplitude of carrier according to modulating signal amplitude |
| B. | Change in frequency of carrier according to modulating signal amplitude |
| C. | Change in amplitude of carrier according to modulating signal frequency |
| D. | Change in amplitude of modulating signal according to carrier signal amplitude |
| Answer» B. Change in frequency of carrier according to modulating signal amplitude | |