A CRO can display:

  1. D.C. signals only
  2. A.C. signals only
  3. Both D.C. and A.C. signals
  4. Time-invariant signals

Answer (Detailed Solution Below)

Option 3 : Both D.C. and A.C. signals
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  • A Cathode Ray Oscilloscope is used for the measurement of AC as well as DC quantities
  • It is used for the calculation of peak to peak voltage, RMS value, duty cycle etc
  • CRO is a very useful and versatile laboratory instrument used for display, measurement and analysis of waveforms
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