Multiple choice

Which among the following minimises the energy consumption and maximises the picture brightness?

  1. A black layer

  2. A cold cathode

  3. The control grid

  4. Hot cathode
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A Correct answer
Explanation

A black layer is a coat on the filament of the indirectly heated hot cathode in a cathode ray tube, intended to optimise the output of electrons from the cathode, thus minimising the energy consumption and heat generated while maximising the picture brightness.

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