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In a cathode-ray oscilloscope (CRO), which of the following is not part of the electron gun assembly?

Difficulty: Easy

Correct Answer: X–Y deflection plates

Explanation:


Introduction / Context:
A CRO creates and steers an electron beam to draw traces on the phosphor screen. The electron gun forms and accelerates the beam, the deflection system steers it, and the screen converts kinetic energy into visible light. Knowing which components belong to which subsystem is fundamental for instrumentation.


Given Data / Assumptions:

  • Electron gun functions: emission, acceleration, beam shaping/focusing, intensity control.
  • Deflection system: electrostatic plates that steer the beam horizontally (X) and vertically (Y).


Concept / Approach:
The electron gun includes a heated cathode, a control grid for beam current (intensity), and a series of anodes for acceleration and electrostatic focusing. The X–Y plates are physically downstream of the gun and provide deflection fields; they are not part of the beam-forming gun itself.


Step-by-Step Solution:

List gun components: cathode, grid, focusing and accelerating anodes.Identify deflection system: separate pair(s) of plates unrelated to emission/acceleration.Therefore, X–Y plates are not a gun component.


Verification / Alternative check:

Block diagram and cutaway views of CROs clearly show distinct ”gun” and ”deflection” sections.


Why Other Options Are Wrong:

Cathode, grid, and anodes are core elements of the electron gun.


Common Pitfalls:

Assuming anything inside the tube neck is the gun; the deflection plates are separate functional elements.


Final Answer:

X–Y deflection plates
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