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Basic fabrication steps

Explain Basic fabrication steps

Basic fabrication steps   Question: Explain Basic fabrication steps? Solution: There are more than 200 processing steps. In IC fabrication the major steps are as followed: Wafer preparation Lithography Oxidation Etching Ion Implantation and Metallization   Explanation of Basic Fabrication Steps in brief Wafer processing is to produce the proper …

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Scaling models and scaling factors in vlsi

Scaling models and scaling factors in vlsi

Scaling models and scaling factors in VLSI   Question: What is Scaling? Why scaling is required? Briefly discuss scaling models of MOS transistor with appropriate scaling factors? Solutions: Scaling: Scaling is the proportional adjustment of the dimensions of an electronic device while maintaining the electrical properties of the device results …

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Maximum average output of 3 phase and 1 phase controlled rectifier

Maximum average output of 3 phase and 1 phase controlled rectifier

The maximum average output of 3 phase and 1 phase controlled rectifier   Question: Show that the maximum average output of 3 phase-controlled rectifiers is greater than 1 phase-controlled rectifier?   Solution For a single phase full wave converter, the average output voltage can be found from   For a …

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Two transistor model of a thyristor(SCR)

Two transistor model of a thyristor

Two transistor model of a thyristor(SCR)   Question: Explain two transistor model of a thyristor(SCR)? or Explain the construction and working principles of a thyristor? or Explain the positive regenerative feedback effect of a thyristor?   Solution: The regenerative or latching action due to positive feedback can be demonstrated by …

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Viva questions for motors part 3

viva questions for motors

Viva questions for motors part 3   Q: While the start button is pressed the motor gets accelerated but stops as soon as the button is released?   Ans: The auxiliary contact of the starter is not working satisfactorily. As this is in parallel with the start button so as long …

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Viva questions of ac motor part 2

Viva questions of ac motor

Viva questions of ac motor part 2   Q: What are the basic differences between the single cage and double squirrel cage induction motor?  Ans: In a double squirrel cage rotor, there are two cages one of high resistance other of low resistance. In the case of a single cage …

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