A pn junction acts as a _______.

This question was previously asked in
URSC ISRO Technical Assistant Electronics 13 November 2016 Official Paper
View all ISRO Technical Assistant Papers >
  1. Controlled switch
  2. Bidirectional switch
  3. Unidirectional switch
  4. None of the above

Answer (Detailed Solution Below)

Option 3 : Unidirectional switch
Free
ISRO Technical Assistant Mechanical Full Mock Test
80 Qs. 80 Marks 90 Mins

Detailed Solution

Download Solution PDF

Unilateral device:

  • A unilateral device is a device that conducts only in one direction.
  • p-n junction diodes conduct only when the p region is connected to higher voltage and n region is connected to lower voltage.
  • When reverse biased, it acts as an open circuit.
  • The symbol for a diode is as shown:

           

  • A pn junction, therefore, acts as a unidirectional switch.

 

Note: Bi-Lateral Devices devices allow current to flow through them in both directions. E.g. Resistor

Latest ISRO Technical Assistant Updates

Last updated on May 30, 2025

-> The ISRO Technical Assistant recruitment 2025 notification has been released at the official website. 

-> Candidates can apply for ISRO recruitment 2025 for Technical Assistant from June 4 to 18.

-> A total of 83 vacancies have been announced for the post of Technical Assistant.

-> The Selection process consists of a written test and a Skill test.

-> Candidates can also practice through ISRO Technical Assistant Electrical Test Series, ISRO Technical Assistant Electronics Test Series, and ISRO Technical Assistant Mechanical Test Series to improve their preparation and increase the chance of selection. 

Hot Links: teen patti royal - 3 patti teen patti joy vip teen patti master golden india teen patti plus