Analog Devices & Circuits May 2018 3rd Sem B.Tech PTU Paper
Download Previous Year PTU University Question Paper of Analog Devices & Circuits BTEC-301 3rd Sem Batch 2012 Onwards B.Tech PTU May 2018 Question Paper
B.Tech.(Electronics Engg.) (2012 Onwards)
B.Tech.(ECE)/(Electronics & Computer Engg.)/(ETE) (2011 Onwards) (Sem.–3)
ANALOG DEVICES & CIRCUITS MAY 2018 PAPER
Subject Code : BTEC-301 M.Code : 57583
Time : 3 Hrs. Max. Marks : 60
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions
Analo Devices & Circuits BTEC-301 3rd Sem Batch 2012 Onwards B.Tech May 2018 Question Paper
SECTION-A
Q1. Answer Briefly.
a) Which configuration of Bipolar Transistor is called as Emitter Follower? For what purpose it is used?
b) What is an Oscillator? How does it differ from an Amplifier?
c) What are the different types of configurations used in multistage amplifier circuits?
d) Explain the effect of coupling capacitor on low frequency response of BJT amplifiers.
e) What are the Barkhusain conditions of oscillations in electronic systems? What is their significance?
f) What is the Miller Effect?
g) Why do we need three RC networks for a phase – shift oscillator?
h) What are the Physical origins of resistances in hybrid -p1 model of CE Transistor amplifier at high frequencies?
i) What is meant by ‘Cross-over Distortion’?
j) Define T model of a Bipolar Transistor.
SECTION-B
Q2. Attempt any FOUR questions. 5×4=20
2. An amplifier has voltage gain with feedback of 100. If the gain without feedback changes by 20% and the gain with feedback should not vary more than 2%, determine the values of open loop gain A and feedback ratio .
3. What are the different types of negative feedback? Explain each with block diagram.
4. A CE connected amplifier has Ccb = 5 pF, Cbe = l2pF, hfe = 100, hie 1.5 k. Find the input capacitance to the circuit for a circuit collector resistance of l2k.
5. Explain bow device Capacitances plays dominant role in CE Amplifier in high frequency region.
6. Draw and explain the working of push pull class-B Amplifier. What are its advantages & disadvantages?
SECTION-C
Q3. Attempt any TWO questions. 2×10=20
7. In a Transistor Colpitt’s oscillator we have L = 100 micro H, LRFC 0.6mH, C1 = 0.001 micro F, C2=l0 micro Farad Find a) operating frequency b) feedback fraction c) minimum gain to sustain oscillations & Emitter Resistance if Rc = 2.5k Q.
8. Draw and explain the working of R-C phase shift oscillator and also derive an expression for its frequency of oscillations.
9. a) Determine the value of ripple factor in the full-wave rectifier operating at 50 Hz with a 100 F capacitor filter and 100 load.
b) Draw and explain the complementary symmetry amplifier and discuss its advantages.
Bipolar Transistor is called as Emitter Follower.
Oscillator and How does it differ from an Amplifier.
Types of configurations used in multistage amplifier circuits.
Effect of coupling capacitor on low frequency response of BJT amplifiers.
Barkhusain conditions of oscillations in electronic systems and their significance.
Miller Effect.
Need three RC networks for a phase – shift oscillator.
Physical origins of resistances in hybrid -p1 model of CE Transistor amplifier at high frequencies.
Cross-over Distortion.
T model of a Bipolar Transistor.
Analog Devices & Circuits 3rd Sem B.Tech May 2018 Question Paper Click Here
An amplifier has voltage gain with feedback of 100. If the gain without feedback changes by 20% and the gain with feedback should not vary more than 2%, determine the values of open loop gain A and feedback ratio.
Types of negative feedback.
CE connected amplifier has Ccb = 5 pF, Cbe = l2pF, hfe = 100, hie 1.5 k. Find the input capacitance to the circuit for a circuit collector resistance of l2k ohm.
Role in CE Amplifier in high frequency region.
Working of push pull class-B Amplifier.
Analog Devices & Circuits 3rd Sem B.Tech May 2018 Question Paper Click Here
Transistor Colpitt’s oscillator we have L = 100 micro H, LRFC 0.6mH, C1 = 0.001 micro F, C2=l0 micro Farad Find a) operating frequency b) feedback fraction c) minimum gain to sustain oscillations & Emitter Resistance if Rc = 2.5k Q.
working of R-C phase shift oscillator.
Ripple factor in the full-wave rectifier operating at 50 Hz with a 100 F capacitor filter and 100 load.
Complementary symmetry amplifier and discuss its advantages.
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