The characteristics of patterns that appear on a CRT screen when sinusoidal voltages are simultaneously applied to horizontal and vertical plates are called ________.

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ALP CBT 2 Electrician Official Paper (Held On: 23 Jan 2019 Shift 3)
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  1. Phase patterns
  2. Lissajous patterns
  3. Colour patterns
  4. Eye patterns

Answer (Detailed Solution Below)

Option 2 : Lissajous patterns
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Detailed Solution

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  • When horizontal deflection plates and vertical deflection plates of CRO (Cathode Ray Oscilloscope) are connected to two sinusoidal voltages, the patterns appear at CRO screen are called the Lissajous pattern
  • The Lissajous pattern obtained in a CRO depends upon frequency, amplitude and phase relationship
  • The patterns used to measure phase and frequency with a cathode ray oscilloscope are called Lissajous pattern.
  • Notes:

    Common Lissajous pattern observed when two signals with different phase angle is applied to the two plates is as shown:

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