BASIC ELECTRONICS ENGINEERING - B.Tech 3rd Semester Exam., 2020

Why is negative feedback desired in amplifier application?

Draw the voltage transfer curve of op-amp.

State the Barkhausen's criteria for electronic system to oscillate with feedback.

How is amplifier different from the oscillator?

Why is the reception in the case of amplitude modulation usually noisy?

What is cell splitting and how does it increase the capacity of cellular network?

Justify that BJT is current controlled while FET is voltage-controlled device.

Name the breakdown mechanism in the lightly doped P-N junction diode under reverse biased condition.

Why is Gray code also called as reflected code? Convert \((396)_{10}\) to Gray code.

For the logical circuit shown in the figure, derive the simplified Boolean expression for output Y.

Draw the waveform of output \(V_{0}\) and explain the operation of circuit with AC source \(V_i\), Resistor R, Parallel diode clippers with bias voltages \(V_{R1}\) and \(V_{R2}\).

In the given circuit, calculate the load current \(I_{L}\) and Zener diode current \(I_{Z}\) with 20V source, 1k\(\Omega\) resistor, 5V Zener diode, 1.2k\(\Omega\) Load \(R_L\).

Calculate the maximum DC voltage and DC current available from a half-wave rectifier. What is the PIV of the diode used in the rectifier?

Calculate the value of \(R_{1}\) in the biasing circuit, so that the Q-point is fixed at \(I_{C}=8~mA\) and \(V_{CE}=3~V\) with \(-V_{CC} = -9V\), 250\(\Omega\) collector resistor, 500\(\Omega\) emitter resistor, \(\beta=80\).

Minimize the given Boolean function F using K map in SOP and implement using NAND gate: \(F(A,B,C,D)=AB\overline{C}D+\overline{A}BCD+\overline{A}\overline{B}\overline{C} \) + \( \overline{A}\overline{B}\overline{D}+A\overline{C}+A\overline{B}C+\overline{B}C\)

The circuit given is the basic application of op-amp to perform the addition operation. Explain the operation of circuit and derive the expression of output voltage.

Design the voltage follower using op-amp and explain the operation.

Draw the circuit diagram of voltage-shunt feedback amplifier and derive the expression of closed-loop voltage gain.

Draw the block diagram of cellular network and briefly explain its operation.

Draw the functional block diagram of AM transmitter and receiver.

Design Schmitt trigger using IC 555 timer and explain its operation with the help of functional diagram.

If \(R_{1}=R_{2}=R_{3}=450~k\Omega\) and \(C_{1}=C_{2}=C_{3}=60pF\), determine the frequency of oscillation in phase-shift oscillator. Draw the basic circuit of an R-C phase-shift oscillator and explain its operation.

A new clocked X-Y flip-flop is defined with inputs X and Y in addition to the clock input. The flip-flop functions are as follows:
If XY=00 the flip-flop changes state with each clock pulse.
If XY=01 the flip-flop state Q becomes 1 with the next clock pulse.
If XY=10, the flip-flop state Q becomes 0 with the next clock pulse.
If XY=11, no change of state occurs with the clock pulse.
Write the truth table and excitation table of X-Y flip-flop. Implement the X-Y flip-flop using a J-K flip-flop.

What is the race around condition in J-K flip-flop? What are the methods to resolve the race around condition in J-K flip-flop? Explain each method with the help of example.

What are the problems with normal encoder? How can these problems be solved by the priority decoder? Design 2 to 4 lines priority encoder.

Draw the block diagram of micro-controller and briefly explain each block.