With respect to CRT, the horizontal retrace is defined as :
2017
With respect to CRT, the horizontal retrace is defined as :
- A.
The path an electron beam takes when returning to the left side of the CRT.
- B.
The path an electron beam takes when returning to the right side of the CRT.
- C.
The technique of turning the electron beam off while retracing.
- D.
The technique of turning the electron beam on/off while retracing.
Attempted by 289 students.
Show answer & explanation
Correct answer: A
Answer: Horizontal retrace is the rapid movement of the electron beam returning from the right side of the screen back to the left side to begin the next scan line.
Details:
A CRT scans each horizontal line from left to right during the visible (forward) scan.
Horizontal retrace (also called horizontal flyback) is the fast return from the right edge back to the left edge after a line is completed.
During retrace the beam is usually blanked (turned off) so that no visible trace is drawn while the beam moves back; that blanking technique is separate from the definition of retrace.
Vertical retrace is analogous and returns the beam from the bottom back to the top between frames.