Question
Download Solution PDFHorizontal input to a scope is Em sin (ωt) V, vertical input to that scope is Em sin (ωt + 30°) V. What is the Lissajous pattern in that CRO?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
When two sinusoidal signals of the same frequency and magnitude are applied two both pairs of deflecting plates of CRO, the Lissajous pattern changes with the change of phase difference between signals applied to the CRO
When 0 < ϕ < 90o or 270o < ϕ < 360o
The Lissajous pattern is of the shape of an Ellipse having a major axis passing through the origin from the first quadrant to the third quadrant.
When 90o < ø < 180o or 180o < ø < 270o
The Lissajous Pattern is of the shape of an Ellipse having a major axis passing through the origin from the second quadrant to the fourth quadrant.
Explanation:
The given inputs are: Em sin (ωt) V, Em sin (ωt + 30°) V
The phase difference between both the inputs = 30°
The Lissajous pattern on the screen of a CRO is an ellipse with a major axis in quadrant 1 and quadrant 3.
Important Points
Last updated on Jul 1, 2025
-> SSC JE Electrical 2025 Notification is released on June 30 for the post of Junior Engineer Electrical, Civil & Mechanical.
-> There are a total 1340 No of vacancies have been announced. Categtory wise vacancy distribution will be announced later.
-> Applicants can fill out the SSC JE application form 2025 for Electrical Engineering from June 30 to July 21.
-> SSC JE EE 2025 paper 1 exam will be conducted from October 27 to 31.
-> Candidates with a degree/diploma in engineering are eligible for this post.
-> The selection process includes Paper I and Paper II online exams, followed by document verification.
-> Prepare for the exam using SSC JE EE Previous Year Papers.