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JTO MCQs

Practice questions are arranged in pages of up to 100 MCQs.

Question 1
Signals & SystemsSampling

According to the sampling theorem, a band-limited signal should be sampled at a rate of at least?

  • AHalf the highest signal frequency
  • BEqual to the highest signal frequency
  • CTwice the highest signal frequency
  • DFour times the lowest signal frequency
Report an error
Correct Answer: C. Twice the highest signal frequency
Explanation: For ideal reconstruction, the sampling frequency must be at least twice the highest frequency component of the band-limited signal.
Reference: Nyquist sampling theorem
Question 2
Communication SystemsAnalog Modulation

In amplitude modulation, which carrier parameter is varied according to the message signal?

  • AFrequency
  • BPhase
  • CAmplitude
  • DWavelength only
Report an error
Correct Answer: C. Amplitude
Explanation: In conventional amplitude modulation, the amplitude of the carrier varies with the instantaneous message signal.
Reference: Amplitude modulation fundamentals