Aquadag coating is most commonly used in CROs to:

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ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 2
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  1. absorb moisture
  2. absorb the extra electrons emitted
  3. absorb and emit the rays
  4. absorb the rays emitted

Answer (Detailed Solution Below)

Option 2 : absorb the extra electrons emitted
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Detailed Solution

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Aquadag: 

  • The bombarding electrons, striking the screen, release secondary emission electrons
  • These secondary electrons are collected by an aqueous solution of graphite called Aquadag which is connected to the second anode
  • It is the conductive coating on the screen
  • Collection of secondary electrons is necessary to keep the CRT screen in a state of electrical equilibrium

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