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Modulation and Demodulation

Free 42+ Modulation and Demodulation MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Modulation and Demodulation — MCQs for Pakistan government job tests

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Modulation and Demodulation

Practice questions

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1.Why is the intermediate frequency (IF) in a superheterodyne receiver selected as the difference between the received and oscillator frequencies rather than their sum?

2.In a TRF radio receiver, to which frequency are the RF and detection sections typically tuned?

3.What is the power contained in the sidebands according to the previous question?

4.Which type of modulation is used for the audio signal in television broadcasting?

5.Where is the diode detector typically located in an AM radio receiver circuit?

6.What is the power contained in the sidebands according to the previous question?

7.What does modulation involve when a low-frequency signal influences a carrier wave?

8.What is the primary benefit of Frequency Modulation (FM) compared to Amplitude Modulation (AM)?

9.What does the superheterodyne principle involve?

10.At which stage does the superheterodyne technique achieve signal selectivity?

11.In a superheterodyne receiver, which stage is responsible for the majority of signal amplification?

12.What term describes a radio receiver that amplifies all incoming signal frequencies with equal effectiveness?

13.What does the abbreviation AVC represent?

14.In a superheterodyne receiver, what signals are fed into the mixer stage?

15.What type of modulation occurs when the frequency of the carrier wave is varied according to the modulating signal?

16.Given an intermediate frequency (IF) of 455 kHz and a radio receiver tuned to 855 kHz, what is the frequency of the local oscillator?

17.What is the primary purpose of a ferrite antenna?

18.A carrier voltage of 100 V is modulated such that its amplitude fluctuates between 160 V and 40 V. What is the modulation index?

19.Given Amin = 40 and Amax = 60, what is the modulation percentage?

20.Which type of oscillator is commonly employed as the local oscillator in a radio receiver?

How to prepare with Modulation and Demodulation MCQs

  • Work through questions topic by topic, then revisit any you answered incorrectly.
  • Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
  • Pair subject practice with past papers to see how Modulation and Demodulation appears in real exam conditions.

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