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Posted Date: 06 Jun 2008 Posted By: kishore Member Level: Gold
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2007 Jawaharlal Nehru Technological University B.Tech Electrical and Electronics Engineering ELECTRONIC DEVICES AND CIRCUITS setno2 Question paper
1. (a) Derive the expressions for acceleration, Velocity and displacement of a charged
particle placed in an electric field E
(b) Two parallel plates of a capacitor are separated by 4cms. An electron is at
rest initially at the bottom plate. Voltage is applied between the plates, which
increases linearly from 0v to 8v in 0.1 m.sec .If the top plate is +ve, determine
[8+8]
i. The speed of electron in 40.n.sec
ii. The distance traversed by the electron in 40.n.sec
2. (a) Explain the formation of depletion region in an open-circuited pn-junction
with neat sketches. [8]
(b) A pn-junction diode has a reverse saturation current of 30 µA at a temperature
of 1250C. At the same temperature find the dynamic resistance for 0.2V bias
in forward and reverse direction. [8]
3. (a) Define the terms as referred to FWR circuit.
i. PIV
ii. average d.c. voltage
iii. RMS current
iv. ripple factor. [8]
(b) A full wave rectifier (FWR) supplies a load requiring 300V at 200mA. Calcu-
late the transformer secondary voltage for
i. a capacitor inpur filter using a capacitor of 10 µF.
ii. a choke input filter using a choke of 10 H and a capacitance of 10µF.
Neglect the resistance of choke. [8+8]
4. (a) Draw the two transistor version of an SCR and explain its firing characteristics
with this circuit. [8]
(b) Explain the working principle of UJT with its characteristics. [8]
5. (a) Explain bias compensation using sensistors. [6]
(b) In the circuit shown, if IC=2mA and VCE=3V. Calculate R1 and R3. (figure
5) [10]
6. (a) Draw the CE amplifier with unbypassed RE and derive the expressions for
voltage gain and current gain. [3+5]
(b) The figure (figure 6) is a swamped FET amplifier. Determine the voltage gain
when RL=100K
. Neglect the FET output resistance (rd) Take gm = 4 mS.
7. (a) Explain with circuit diagram a negative feedback amplifier and obtain expres-
sions for its closed loop gain. [4+4]
2 of 3
Code No: R05010204 Set No. 2
(b) The gain of an amplifier is decreased to 1000 with negative feedback from
its gain of 5000. Calculate the feedback factor and the amount of negative
feedback in dB.
[8]
8. (a) Draw the circuit diagram of a RC phases shift oscillator using BJT. Derive
the expression for frequency of oscillators.
(b) Classify different type of oscillators based on frequency range.
(c) Why RC oscillators are not suitable for high frequency applications. [8+4+4]
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