Thursday, September 8, 2016
Total No. of Questions : 09
B.Tech. (ECE/ETE) (Sem.–3)
ANALOG DEVICES AND CIRCUITS
Subject Code : BTEC-301 (2011 Batch)
Paper ID : [A1130]
INSTRUCTIONS TO CANDIDATE:
1. Section –A, is Compulsory.
2. Attempt any four questions from Section-B.
3. Attempt any two questions from Section-C.
(a) Draw the small signal equivalent model of transistor.
(b) Define the term hole in context o semiconductors.
(c) What is meant by term saturation current in a BJT.
(d) What is the criterion for oscillation in oscillators.
(e) Draw the circuits of CB, CE and CC configurations using npn transistor.
(f) What do you understand by early effect in transistors.
(g) Give the principle of operation of LED.
(h) Briefly compare BJT and JFET.
(i) What is meant by the term load line?
(j) List various types of oscillators?
Q.2. In a fixed bias circuit determine Ib,Ic,and Vce if transistor is of silicon. The values of various circuit parameters are: Vc=12 V,Rb=4.2MΩ, RC=2KΩ and β=10.
Q.3. What are the factors that are responsible for destabilizing the operating point of transistor? Discus the various stability factors.
Q.4. Discus working of class B-push-pull amplifier.
Q.5. How is zener diode used as a regulator?
Q.6. Describe the components of current in an npn transistor
Q.7. Derive the expressions for gain, input impedance and output impedance for a CE amplifier using h-parameters.
Q.8. Derive conditions for sustained oscillations in a RC Phase shift oscillator.
Q.9. Write short notes on:
(a) Feedback effect in amplifiers.
(b) Pinch-of in JFET.
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