Dr.A.P.J.Abdul Kalam University
Bachelor of Engineering
Third Semester Main Examination, Dec-2020
Electronic Devices & Circuits (EC223T)
Branch-EC
Time: 3:00 Hrs Max Marks 70
Note: (i) Attempt any five questions out of eight.
(ii) Assume suitable data if necessary & state them clearly
Q.1 (a) Explain briefly about the semiconductor and its types. 7
(b) What is biasing? Explain the need of it. List out different types of biasing methods. 7
Q.2 (a) In a silicon transistor circuit with a fixed bias Vcc=9v,
Rc=3kΩ, RB=8kΩ, β=50 & VBE=0.7 V. Find the operating point &
stability factor. 7
(b) Explain the operation of cc configuration of BJT and its input
& output characteristic briefly. 7
Q.3 (a) Explain the Avalanche and Zener Breakdowns in PN Junction diode. 7
(b) For a Ge diode, the Io = 2 μA and the voltage of 0.26 V is applied. Calculate the forward and reverse dynamic resistance value at room temperature. 7
Q.4 (a) Discuss analysis of transistor amplifier using h-parameter in CE configuration. 7
(b) Briefly explain current mirror circuit. 7
Q.5 (a) Explain the working of n-channel enhancement MOSFET. 7
(b) Explain the construction and working of P-channel JEFT. 7
Q.6 (a) Write the difference between BJT & FET. 7
(b) Explain the working of class C amplifier. 7
Q.7 (a) What is UJT? Write its characteristics. 7
(b) Compare Diac and Triac. 7
Q.8 Write short notes on (Any 2) 14
(a) Photo diodes
(b) Ebers-Moll model
(c) Silicon controlled rectifier (SCR)
(d) Thyristor’s applications
%20and%20F.Y.%20&%20S.Y.B.Sc.%20Comp.%20Sci.%20and%20F.Y.B.Sc.%20N.T%20(2013-14)OldQnpapers1314_page-0129.jpg "University of Mumbai S.Y.B.Sc. (I.T) (Sem - IV) Software Engineering (Old & Rev) Old Question Papers June 2014")
%20and%20F.Y.%20&%20S.Y.B.Sc.%20Comp.%20Sci.%20and%20F.Y.B.Sc.%20N.T%20(2013-14)OldQnpapers1314_page-0125.jpg "University of Mumbai S.Y.B.Sc. (I.T) (Sem - IV) Operating System (Old) and Quantitaive Technology (Rev) Old Question Papers June 2014")
%20and%20F.Y.%20&%20S.Y.B.Sc.%20Comp.%20Sci.%20and%20F.Y.B.Sc.%20N.T%20(2013-14)OldQnpapers1314_page-0131.jpg "University of Mumbai S.Y.B.Sc. (I.T) (Sem - IV) E-Commerce (Old) and Embedded System (Rev) Old Question Papers June 2014")
