Analog Electronics (EX-305) - Important Questions

A full-wave rectifier uses an L-type choke input filter comprising a 10 H choke and 8 uF capacitor. Determine the ripple factor at a load current of 50 mA and compare with a simple 8 uF capacitor input filter. Determine suitable L and C values for a given ripple specification.

Explain half-wave and full-wave rectification using diodes with suitable circuit diagrams, waveforms and working.

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

Discuss load line analysis for BJT biasing with suitable diagram and example.

A self-biased p-channel JFET has pinch-off voltage Vp = 5 V and IDSS = 12 mA. The supply voltage is 12 V. Determine the values of RD and RS so that ID = 5 mA and VDS = 6 V.

Explain the working principle of FET and MOSFET. What are the types of MOSFET? Explain depletion and enhancement MOSFET with characteristics and diagrams.

Describe feedback amplifier, concept of feedback, positive vs negative feedback, and effect/merits of negative feedback on gain, bandwidth and distortion.

Explain power amplifier classes A, B, AB and C with circuit diagrams, working, operating point and efficiency comparison.

Explain sinusoidal oscillators. Explain the working of RC phase shift and Wien bridge oscillators with circuit diagrams and derive the expression for frequency of oscillation. Discuss Hartley-Colpitts LC and crystal oscillators briefly.

Discuss clipper circuits and explain how a double-ended / two-level clipper with equal and unequal clipping levels can be implemented with suitable example and diagrams.

Define CMRR. Explain the working of a differential amplifier with circuit diagram, differential and common-mode gain, and its uses.

Explain the Darlington pair transistor circuit with diagram, working and applications.

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 diagrams.

Write short notes on any two of the following: (a) Op-Amp as inverting, non-inverting amplifier, summer, differentiator and integrator (b) 555 timer and its applications (c) Active filters and Schmitt trigger using Op-Amp.