The cold cathode discharge method is used in:

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ALP CBT 2 Electrician Previous Paper: Held on 23 Jan 2019 Shift 2
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  1. Mercury lamp
  2. CFL
  3. Neon lamp
  4. All of the above

Answer (Detailed Solution Below)

Option 3 : Neon lamp
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Gas discharge lamp:

A gas discharge lamp is one in which some inert gas is filled in a glass tube having two electrodes sealed into each end, which on heating allows the flow of electron through it.

To obtain a continuous flow of electron, gas is first charged but as the supply is disconnected from the bulb, the gas is discharged. Such a lamp is known as an electric gas discharge lamp.

Electric gas discharge lamps are of two main types:

1. Cold cathode lamp

2. Hot cathode lamp

In the first type, no filament is used to heat the electrode for starting but in the second type, a filament is provided for heating the main electrode at the time of starting.

Cold cathode lamps: Neon lamp, neon sign tubes, sodium vapor lamp.

Hot cathode lamps: mercury vapor lamp (medium pressure), and fluorescent tube (low-pressure mercury-vapor lamp).
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