Question
The basic components of an optocoupler are _____.
This question was previously asked in
RRB ALP/Technician 2018 CBT 2 Electronics Mechanic Question Paper (23-Jan-2019) (Shift 1)
The correct answer is
LED and phototransistor
Optocoupler Essential Components
An optocoupler, also known as an optoisolator, is an electronic component designed for signal transfer between two isolated circuits using light.
The basic structure comprises:
- A light-emitting component, typically a Light Emitting Diode (LED), which converts the input electrical signal into light pulses.
- A light-detecting component, most commonly a phototransistor, which senses the light from the LED and converts it back into an output electrical signal.
These components are sealed within a single package, providing electrical isolation between the input and output sides.
Thus, the essential building blocks are an LED and a phototransistor.
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List – I List – II a. LASER i. Emits monochromatic light of low intensity b. Solar cell ii. Consumes electrical power due to tHe incident light c. Photo diode iii. Delivers power to load d. LED iv. Emits monochromatic light of high intensity Codes :
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