STUPIDSID
1 (a)
Explain transistor in its fixed bias mode with relevant expression.
6 M
1 (b)
With a neat sketch, explain transistor as a switch.
6 M
1 (c)
For the circuit shown calculate IB, IC, VCE, VC, VE, VB. Assume β=100.
8 M
2 (a)
Explain the VI characteristics of n-channel JFET and define various conditions.
8 M
2 (b)
Explain the construction and working of n-channel depletion mode MOSFET.
8 M
2 (c)
Mention merits and demerits of IGBT.
4 M
3 (a)
Explain the construction and working of phototransistor and mention its applications.
10 M
3 (b)
What are optocouplers? Explain the working and characteristics of optocoupler.
10 M
4 (a)
Derive expression for Ai, Zi, Av, Yo, Ap for a transistor amplifier using h-parameter model.
12 M
4 (b)
Explain the need for cascading amplifier and with the block diagram, explain two stage cascaded amplifier.
8 M
5 (a)
Explain different fb amplifier.
8 M
5 (b)
with the block diagram, explain the negative feedback in small amplifier.
6 M
5 (c)
An amplifier having a voltage gain of 60dB uses 1/20th of its output in negative feedback. Calculate the gain with feednack, the percentage change in gain without and with feedback consequent on 50% change in gm.
6 M
6 (a)
Explain the construction working of RC phase shift oscillator.
8 M
6 (b)
Find the frequency of the oscillations of a Colpitts oscillator having C1=150pF, C2=1.5 nF and L=50μH.
4 M
6 (c)
With a circuit diagram, explain the working of RC low pass and RC high pass circuits.
8 M
7 (a)
With a block diagram, explain the working of three terminal voltage regulators.
6 M
7 (b)
Explain the construction and working of SMPS and mention different types of switching regulators.
8 M
7 (c)
Define the terms load regulation, line regulation and output resistance for a voltage regulator.
6 M
8 (a)
Briefly explain characteristics of an ideal op-amp and compare with practical op-amp.
10 M
8 (b)
With relevant formulas, neat diagram and wave form explain op-amp Schmitt trigger.
10 M
More question papers from Analog and Digital Electronics