Analog Electronics (EX-305) - Important Questions

Numerical problems on LC / L-type choke-input filter with full-wave rectifier to determine ripple factor and L, C values.

Draw and explain the V-I characteristics of a P-N junction diode in forward and reverse bias, including working principle and applications.

Explain half-wave and full-wave rectification using diodes with suitable diagrams.

Explain the working of Zener diode with circuit diagram and give its applications.

Explain the working of a half-wave rectifier with the help of a diagram.

Discuss the principle / working of Zener diode and tunnel diode.

Explain the operation / working principle of tunnel diode and its V-I characteristics with diagrams.

Explain what is meant by breakdown in a P-N junction and why operation in the breakdown region should be avoided.

Show that the maximum rectification efficiency of a full-wave rectifier is $81.2\%$.

Explain voltage multiplier circuits and mention its applications.

Discuss load line analysis.

For a self-biased p-channel JFET with given $V_P$, $I_{DSS}$ and supply voltage, determine $R_D$ and $R_S$ for specified $I_D$ and $V_{DS}$.

Explain/describe the biasing techniques of BJT.

Discuss about thermal runway and thermal stability.

Explain the working principle of FET.

Write short notes on: a) MOSFET; b) Schottky diode; c) Hartley-Colpitts oscillator; d) Schmitt trigger.

What is CMOS? Write its merits.

Define current gains $\alpha$ and $\beta$ of a transistor and derive the relationship between them.

Compare / contrast CB, CE and CC transistor configurations.

Compare NPN and PNP transistor circuits and explain the operating regions of BJT.

Discuss small signal analysis of transistor using h-parameters and explain the h-parameter equivalent circuit of BJT.

Define h-parameters (n-parameters) of a transistor.

Explain power amplifier classes (A, B, and classification by operating point) with circuit diagrams and working

Describe feedback amplifier, concept of feedback, positive vs negative feedback, and effect/merits of negative feedback including gain

Write short note on LC oscillator.

Explain the working of R-C phase shift oscillator.

Derive the expression for frequency of oscillation of RC phase shift oscillator.

Calculate frequency of oscillation of Wien bridge oscillator for given R and C values.

Explain how bandwidth is increased by using negative feedback

Numerical problem on class B power amplifier to find maximum load power, DC input power and collector efficiency

Design the feedback circuit of a Wien bridge oscillator for given output frequency.

Explain clippers and the operation of a double-ended / two-level clipper with equal and unequal clipping levels, with diagrams and examples.

Explain the working of a differential amplifier and its use, including definition of CMRR.

Explain the Darlington pair transistor circuit.

Draw the circuit diagram of astable multivibrator and explain its working with the help of waveforms.

Determine the reverse current at $t=0$ when a forward-biased P-N junction in series with a resistor is instantaneously reverse-biased.

Discuss the clamping theorem and design a biased positive clamper with waveforms.

Numerically calculate CMRR in dB from given differential and common-mode inputs and outputs.

Explain the characteristics of an ideal Op-Amp, compare ideal vs practical Op-Amp, and give applications of Op-Amp circuits.

Explain the working of op-amp as log and antilog amplifier with suitable diagram.

Draw and explain the inverting and non-inverting modes of an Op-Amp.

Explain log amplifier and design a logarithmic amplifier for given input voltage and reference current.

Explain the 555 timer circuit with its applications.

Explain Inverting zero crossing detector along with neat waveforms.

Explain the working of Op-Amp as differentiator and integrator.

Explain how an integrator is implemented using Op-Amp and show output waveforms for sinusoidal and square wave inputs.

Explain the operation of an astable multivibrator using the internal circuit diagram of IC555 and derive the expression for frequency of oscillation.

Calculate cutoff frequency and pass band gain for second order low pass filter if $R=27K\Omega$, $R_F=7K\Omega$, $R_1=R_2=33K\Omega$, $C_1=C_2=0.0047\mu F$.

Write a short note on any four of the following: