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Electronic Devices and Circuits

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Institute of Engineering • 2083 Baishakh Board Examination

Q1[2 Marks]The Bipolar Junction Transistor (BJT)

Draw the small signal model of voltage divider bias for emitter bypassed capacitor CE amplifier circuit and find its input impedance, output impedance and voltage gain.

Q2[2 Marks]The Bipolar Junction Transistor (BJT)

Draw the ac equivalent circuit for a CE amplifier (emitter resistor unbypassed) and derive the expressions for voltage gain, input impedance.

Q3[6 Marks]Operational Amplifier Circuits and Oscillator

Draw Wien Bridge oscillator circuit and derive the expression for frequency of oscillation and gain of amplifier circuit.

Q4[7 Marks]Output Stages and Power Amplifiers📐 Diagram in Paper

Draw the circuit diagram of class A series fed amplifier and its corresponding characteristic graph. And, find its general efficiency.

Q5[2 Marks]Output Stages and Power Amplifiers📐 Diagram in Paper

Draw the circuit diagram of class A series fed amplifier and its corresponding characteristic graph. And, find its general efficiency.

Q6[4 Marks]Power Supplies, Breakdown Diodes, and Voltage Reference

Derive the expression for stability factor of a discrete-transistor series regulator.

Q7[4 Marks]Power Supplies, Breakdown Diodes, and Voltage Reference

Design a DC voltage regulator for

6 V

15 V

output using LM317.

Q8[1 Marks]Field-Effect Transistor

Design

β

independent type dc biased common collector amplifier, and find its current gain and input resistance. Given parameters:

V_{C C} = 20 VDC

I_{C} = 2 mA

and

β = 100

and use firm biasing method.

Q9[6 Marks]Field-Effect Transistor

Describe the construction and working principle of n channel enhancement-type MOSFET with the help of necessary diagrams and its drain characteristic curve.

Q10[1 Marks]The Bipolar Junction Transistor (BJT)📐 Diagram in Paper

What is the main difference between RC and LC oscillator circuits in terms of application? Explain the operation of Wien Bridge Oscillator circuit with the help of circuit diagram and necessary mathematical expressions.

Q11[5 Marks]Field-Effect Transistor

Explain how a base current compensation circuit reduces the difference between

I_{0}

and

I_{R E F}

in a simple current mirror circuit.

Q12[6 Marks]The Bipolar Junction Transistor (BJT)

For a class B amplifier providing a

20 V

peak signal to a

16 Ω

load (speaker) and a power supply of

V_{C C} = 30 V, d e t er min e

the input power, output power, and circuit efficiency.

Q13[4 Marks]Power Supplies, Breakdown Diodes, and Voltage Reference

Design a 5V to 20V variable dc voltage regulator using LM317.

Q14[6 Marks]The Bipolar Junction Transistor (BJT)

Explain different large signal models of pn junction diodes.

Q15[6 Marks]Operational Amplifier Circuits and Oscillator

Design DC voltage regulator for

6 V

output. Given data are

V_{z} = 6 V

I_{z} = 20 mA

I_{z k} = 2 mA

P_{z ma x} = 500 mw

and

r_{z} = 10Ω

. The nominal input voltage is

15 V \pm 30%

DC. Find maximum current it can delivers to the load.

Q16[8 Marks]The Bipolar Junction Transistor (BJT)

Design a common base amplifier circuit using

β

independent method. Given parameters are

V_{C C} = 22 V, I_{E} = 1.5 mA, β = 110

and input and output impedances are comparatively large. Use appropriate guidelines to support your design.

Q17[4 Marks]The Bipolar Junction Transistor (BJT)

Explain the operation of BJT as a switch.

Q18[7 Marks]The Bipolar Junction Transistor (BJT)

Describe the construction and working principal of DMOSFET with the help of drain characteristics curve, transfer characteristics curve and mathematical expression.

Q19[6 Marks]Output Stages and Power Amplifiers📐 Diagram in Paper

Draw the circuit diagram of Class A tuned amplifier and determine the range of frequency in which it gives maximum gain within

3 dB

range.

Q20[8 Marks]Operational Amplifier Circuits and Oscillator📐 Diagram in Paper

Define the term multivibrator. Explain the operation of op-amp based astable multivibrator for square wave with the help of circuit diagram and waveforms and also determine its frequency of oscillation.

Q21[6 Marks]Power Supplies, Breakdown Diodes, and Voltage Reference

Draw the series dc voltage regulator with current limiting element and explain how it works.