Opto-Isolator device consists of the following device/devices _______.

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URSC (ISRO) Technician B: Electronic Mechanic Previous Year Paper (Held on 24 March 2019)
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  1. Diodes and resistors
  2. Amplifiers and Capacitors 
  3. LEDs and photo-diodes 
  4. Laser diodes and LEDs

Answer (Detailed Solution Below)

Option 3 : LEDs and photo-diodes 
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Detailed Solution

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  • An optocoupler (also called an opto-isolator, photocoupler, or optical isolator) is an electronic component that transfers electrical signals between two isolated circuits by using light.
  • Opto-isolators prevent high voltages from affecting the system receiving the signal.

There are many different types of optocouplers are available based on their needs and switching capabilities. Depending on the use there are mainly four types of optocouplers are available.

  • Opto-coupler which use Photo Transistor
  • Opto-coupler which use Photo Darlington Transistor
  • Opto-coupler which use Photo TRIAC
  • Opto-coupler which use Photo SCR

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