Principal and Application of semiconductor Technology — DU B.Sc. (Prog.) Physical Science courses pertaining to Electronics Previous Year Question Papers

Attempt five questions in all. a. Draw a simple block diagram of a transducer system and explain it briefly. b. What is a strain gauge? Explain its working principle briefly. c. List any two fabrication techniques used in MEMS. Mention one key application. e. Classify sensors into physical, chemical and biological categories. Mention one d. What are the key selection criteria for choosing a sensor for any application? example each. f. Write a short note on conducting polymers and mention two types. a. Discuss the importance of sensitivity, accuracy and resolution in transducer performance, providing examples of how these characteristics impact measurement outcomes. b. Explain the operation of a capacitive displacement transducer, highlighting its advantages and limitations. c. Describe the operation and applications of NEMS switches, including their advantages in terms of power consumption and switching speed. (6+6+6) a. Explain the key characteristics of sensors, including range, resolution, sensitivity and accuracy. Discuss their impact on measurement outcomes. b. Describe the operating principle and advantages of Lithium Polymer (LiPo) Batteries, including their flexibility and potential applications. c. Discuss the characteristics and potential applications of Sodium-Sulfur (NaS) Batteries, highlighting their benefits and challenges in terms of energy storage and grid-scale applications. a. Define the terms EMF (Electromotive Force) and free energy in the context of electrochemical cells. Discuss the differences between reversible and irreversible b. Discuss the advantages and disadvantages of Lithium Batteries, including their high energy density and potential safety concerns. c. Explain the operating principle and applications of Silver Oxide Batteries, highlighting their unique features and benefits. a. Describe the structure of conducting polymers, focusing on a-conjugation and doping. Discuss their impact on electrical conductivity. b. Describe the structure and properties of Polyacetylene (PA), Polypyrrole (PPy) and Polyaniline (PANI), highlighting their unique characteristics and applications. c. Explain the working principle of OLEDs, focusing on charge injection, charge transport, recombination and light emission. b. Describe the impact of material properties and device architecture on the performance of organic solar cells, highlighting potential areas for improvement. c. Discuss the potential applications of organic electronics, including displays, lighting and energy harvesting.