Download AKTU B-Tech 2nd Sem 2016-17 REC201 Basic Electronics Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 2nd Semester (Second Semester) 2016-17 REC201 Basic Electronics Question Paper

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B.TECH.
THEORY EXAMINATION (SEM?II) 2016-17
BASIC ELECTRONICS
T ime : 3 Hours Max. Marks : 70
Note .' Be precise in your answer. In case ofnumerical problem assume data wherever not provided.
SECTION ? A
1. Explain any seven of the following: 7 x 2 = 14
(a) Classify the materials with help of energy band.
(b) Explain the principle of operation of LED.
(c) Derive the relationship between a and [3.
(d) Why are FET called unipolar device?
(e) Write down the constructional difference between Depletion type and Enhancement
type MOSFET.
(f) Derive the circuit of integrator using an ideal Op?Amp.
(g) State the advantages of digital instruments over analog instruments.
(h) Brie?y discuss the need of modulation in communication engineering.
SECTION ? B
2. Attempt any ?ve of the following questions: 5 x 7 = 35
(a) Explain the V?I characteristic of p-n junction diode. How it is differ from Zener diode?
(b) Draw the circuit and discuss the working of full wave bridge rectifier with suitable
input ?output waveforms. What is PIV of bridge rectifier?
(c) Draw and explain the construction and working of p?channel depletion type MOSFET.
Also draw the characteristics of p?channel depletion type MOSFET.
(d) Calculate the output voltage for the circuit of Figure lwith inputs of V1: 40 mV rms
and V2=20 mV rms.
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4? k9
V1 _m_. \ +13?!
62' T
V: _m_..'_ _ /1_1
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?15 V
Figure 1
(e) Given that ICQ = 2 mA and VCEQ =10 V, determine R1 and RC for the network of
Figure2.

Figure 2
(f) Draw and explain the block diagram of Ramp type digital voltmeter. Also dIaw related
voltage to time conversion waveforms.
(g) Derive the expression for AM modulated waveform. Also derive the expression for
modulation index.
(h) Describe the operation of CRT with neat block diagram. How unknown frequency is
measured using CRO?
SECTION ? C
Attempt any two of the following questions: 2 x 10.5 = 21
(a) Explain principle of operation and construction of Tunnel diode. Draw its V-I
characteristic.
(b) Design a clamper to perform the ?mction indicated in Figure 3.
'0
Figure 3
(a) Draw and explain the N-channel J FET and draw its transfer characteristics.
(b) Draw and explain the differential ampli?er. De?ne CMRR and slew rate in Op-Amp.
(a) Draw the CE n-p-n BJT characteristics. Also explain the self bias configuration in
DC bias con?guration.
(b) Discuss the need of modulation in the communication engineering. Which types of
modulations are used in television?