Multiple choice

What is the main function of choke in an electrical tube?

  1. It increases voltage.

  2. It decreases voltage.

  3. It gives large impedance of AC.

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Choke coil works as an inductor and creates high voltage needed for ionization of gases in the tube. For the tubelight to glow, gases present in the tube should be ionized which requires high voltage, but the supply at domestic level is only around 220 V. The starter switches on and off the current through choke coil, which helps to build high transient voltage around choke coil.

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