JNTU B.Tech II PULSE AND DIGITAL CIRCUITS Previous Question Paper (April - 2018 - R13)

What is an attenuator? What are its applications?

Explain the working of a ringing circuit.

Explain the working of comparator.

What is meant by synchronized clamping and what are its applications?

Explain the working of diode as a switch.

Explain the operating principle and applications of sampling gates.

Write the working principle of astable multivibrator.

Write the working of Bootstrap timebase generators.

What are relaxation circuits and what are their applications?

Write the characteristics of TTL and CMOS logic families.

Discuss the response of high pass RC circuit to step, ramp exponential and sinusoidal input signals with necessary expressions and wave forms.

A symmetrical square wave whose peak to peak amplitude is 2V and average value is zero is applied to RC integrating circuit. The time constant is half the period of the square wave finds the peak to peak valves of the output Voltage. Sketch the steady state output waveform.

Discuss the response of a low – pass RC circuit for step, ramp and exponential inputs with help of neat diagrams.

What is time constant of an RC circuit? Derive an expression for time constant of an RC circuit.

State and prove clamping circuit theorem and explain how sine wave can be converted into a square wave using Zener diodes.

Design a diode clamper circuit to clamp the positive peaks of the input signal at zero level. The frequency of the input signal is 500Hz.

Explain the working of a diode series clipper and shunt clippers along with their transfer characteristics and their output voltages.

Explain the working of a diode comparator with the help of neat diagram and write the applications of voltages comparators.

Explain the transistor switching times with typical diagram and discuss the break down voltage considerations of a transistor.

Discuss the practical considerations in design of a transistor switch with help of neat diagram and explain the saturation parameters of a transistor.

Explain of Bipolar junction transistor as switch with help of neat diagram and discuss about transistor Switching times.

Explain the working of UJT relaxation oscillator and mention some important applications of thyristors.

Draw a neat diagram of a transistor bistable -multivibrator and explain its principle of operation.

The circuit parameters of a fixed bias bistable multivibrator are: Vcc =vbb=5v, RC=1KΩ, R1= 5KΩ, R2=25KΩ. The hfe of n-p-n transistor is 20. Calculate the stable state currents and voltages and find the maximum ICBO at which the circuit functions satisfactorily (assume all junction voltages to be zero).

Explain the operation of a mono-stable multivibrator with triggering circuits and waveforms and derive an expression for its pulse width.

Discuss the similarities and differences between Miller sweep circuit and Bootstrap sweep circuit.

Explain the working of a four diode sampling gate with help of neat diagrams and mention the applications of sampling gates.

Explain with necessary circuit diagram, the operation of a uni directional sampling gate for multiple inputs.

What are logic gates? Write various logic gates symbols and their truth tables.

Explain the Boolean laws of addition and multiplication with examples.

Draw a neat diagram of a two input NAND gate using transistors (TTL) with totem pole connection and explain its working in detail.