Semiconductors & Electronic Devices

Year – 2024

1. Why silicon is not used to make LED? (JNTUH-Jan/Feb 2024) 1M
2. Write the difference of Diode and Zener Diode. (JNTUH-Jan/Feb 2024) 1M
3. Derive voltage expression and working of the Bipolar Junction Transistor (BJT). (JNTUH-Jan/Feb 2024) 5M
4. Describe construction and principle of LED. (JNTUH-Jan/Feb 2024) 5M
5. Describe the I-V characteristics of solar cell and photo diode. (JNTUH-Jan/Feb 2024) 5M
6. Write the working principle of PIN and Avalanche photo detectors. (JNTUH-Jan/Feb 2024) 5M
7. How CNTs are useful in the field of engineering and technology. (CBIT-June 2024) 2M
8. Explain Ball milling method to prepare Nano particles. (CBIT-June 2024) 5M
9. Explain properties of Nano materials. (CBIT-June 2024) 5M
10. Discuss Surface area to volume ratio and Quantum confinement. (CBIT-June 2024) 5M
11. List the applications of Nano materials at various fields. (CBIT-June 2024) 5M

Year – 2023

1. What will be the temperature co-efficient of an intrinsic semiconductor? (JNTUH-Sep 2023) 1M
2. How the bulk resistance of the semiconductor changes as the doping increases? (JNTUH-Sep 2023) 1M
3. State Hall effect. (JNTUH-Mar/Apr 2023) 1M
4. List out applications of BJT. (JNTUH-Mar/Apr 2023) 1M
5. How n-type and p-type semiconductors are produced? (JNTUH-Sep 2023) 5M
6. Distinguish between Zener and avalanche breakdown? (JNTUH-Sep 2023) 5M
7. Explain working principle of Zener diode. (JNTUH-Mar/Apr 2023) 5M
8. Illustrate working mechanism of PIN diode in forward and reverse bias. (JNTUH-Mar/Apr 2023) 5M
9. With a neat diagram, describe working principle of Avalanche Photo Diode (APD). (JNTUH-Mar/Apr 2023) 5M
10. Distinguish between intrinsic and extrinsic semiconductors. (JNTUH-Mar/Apr 2023) 5M
11. Outline the working principle of solar cell. (CBIT-March 2023) 2M
12. Develop an expression for the concentration of holes for an intrinsic semiconductor. (CBIT-March 2023) 5M
13. Explain the construction and working of Light emitting diode. (CBIT-March 2023) 5M
14. Classify intrinsic and extrinsic semiconductors. (CBIT-March 2023) 5M
15. Explain Hall effect and obtain an expression for Hall coefficient. (CBIT-March 2023) 5M
16. Determine the surface to volume ratio of a sphere of radius “r”. (CBIT-2024) 2M
17. Explain the synthesis of nano materials using Sol-Gel method with neat sketch. (CBIT-2024) 5M