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EEE Interview questions VII

1. What is Flip Flop?
     It is an electronic circuit with two stable states that can be used to store binary data. The stored data can be changes by changing the input. It is also called as latching

2. What is transistor?
  • Transistor is an electronic device used to amplify or switch Signal 
  • It is a three terminal device made up of semiconductor material 
  • These terminals are used to connect with external circuit
3. What is NPN transistor?
  • It consists of one P doped semiconductor material in between two N doped semiconductor materials
  • It passes electrons from emitter to collector so the current flow from collector to emitter 
  • The emitter emits electrons into base which controls number of electrons that emitter emits
4. What is PNP transistor?
  • It consists of  N doped semiconductor material in between two P doped semiconductor layer
  • It emits electrons from collector to emitter so the current flow from emitter to collector 
5. What is the difference between NPN and PNP Transistor?
  • In NPN transistor, electrons are the majority charge carriers where as in PNP transistor holes are the majority charge carriers 
  • In NPN transistor Current flow from collector to emitter where as in PNP transistor current flow from emitter to collector 
  • NPN transistor switch on by high Signal where as PNP switch on by low Signal
6. What are the types of flip flip?
  • D flip flop
  • JK flip flop
  • SR flip flop
  • T flip flip
7. What is Multiplexer?
     Multiplexer is a device which compresses one or more input Signal into one single output Signal 

8. What are the types of Multiplexer?
  • 2-1 Multiplexer (1 select line)
  • 4-1 Multiplexer (2 select line)
  • 8-1 Multiplexer (3 select line)
  • 16-1 Multiplexer (4 select line)
9. What is the applicantion of Multiplexer?
  • Communication system
  • Computer memory
  • Telephone network
  • Transmission from computer to satellite 
10. What is Demultiplexer?
      It is a device which converts single input Signal into multiple output Signal 

11. What are the types of Demultiplexer?
  • 2-1 Demultiplexer 
  • 4-1 Demultiplexer 
  • 8-1 Demultiplexer 
  • 16-1 Demultiplexer 
12. What are the applicantion of Demultiplexer?
  • Communication system
  • Arithmetic Logic Unit
  • Serial to parallel converter
13. What is Digital Signal processing?
      It involves in processing of signals by various techniques to improve the accuracy and reliability of Digital communications

14. What is difference between analog and Digital Signal?
       Analog Signal varies with variation with time where as Digital Signal doesnot varies with time

15. What is PLC?
       Programmable Logi controller is used in industries for processing, manufacturing and automation to increase the reliability and accuracy of production

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