BASICS OF ELECTRONICS ENGINEERING EC100 QUESTION PAPER WITH ANSWERS FOR S1-S2 KTU STUDENTS [FIRST YEAR] Part - ||


BASICS OF ELECTRONICS ENGINEERING QUESTION PAPER WITH ANSWERS

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6. Write the type number of the following:

a) Low frequency low power transistor,
b)High frequency low power transistor, c) Power Transistor, d) Rectifier Diode.

A.
Low frequency low power transistor= AC540
High frequency low power transistor=AF125
Power Transistor=TO220
Rectifier Diode

Model
Number
Diode
Type
Peak
Inverse
Voltage
Current
1N4001
Rectifier
50 V
1 A
1N4002
Rectifier
100 V
1 A
1N4003
Rectifier
200 V
1 A
1N4004
Rectifier
400 V
1 A
1N4005
Rectifier
600V
1 A
1N4006
Rectifier
800 V
1 A
1N4007
Rectifier
1,000 V
1 A

7. What is the working principle of SMPS?

A.
SMPS means switch mode power supply. This works on the principle of switching
regulation. The SMPS system is highly reliable, efficient, noiseless and compact because the
switching is done at very high rate, in the order of several KHz to MHz.

8. Describe the role of different capacitors in RC coupled amplifier.

A.
  • Coupling capacitor CC is used to connect the output of first stage to the base, i.e.
input of the second stage and this continues when more stages are connected. The
coupling capacitor CC transmits AC signal but blocks DC. This prevents DC
interference between various stages and the shifting of operating point.
  • The emitter bypass capacitor offers a low resistance path to the signal. Without this
capacitor the voltage gain of each stage would be lost.

9. Define bandwidth of an amplifier and mark the important parameters in the frequency response graph.

A.

The bandwidth (BW) of an amplifier is the difference between the frequency limits of the
amplifier, the bandwidth represents the amount or "width" of frequencies, or the "band of
frequencies," that the amplifier is MOST effective in amplifying. However, the bandwidth is
NOT the same as the band of frequencies that is amplified.

Frequency response graph

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10. Draw the internal block diagram of op-amp and write the functions of each block.

A.
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Input stage: It consists of a dual input, balanced output differential amplifier. 



Its function is to amplify the difference between the two input signals. It provides high differential gain,

high input impedance and low output impedance.


Intermediate stage

The overall gain requirement of an Op-Amp is very high. Since the input stage alone cannot provide such a high gain. Intermediate stage is used to provide the
required additional voltage gain.

It consists of another differential amplifier with dual input, and unbalanced (single ended)
output.

Buffer and Level shifting stage

As the Op-Amp amplifies D.C signals also, the small D.C. quiescent voltage level of previous stages may get amplified and get applied, as the input to the next stage causing distortion to the final output.

Hence, the level shifting stage is used to bring down the D.C. level to ground potential, when no signal is applied at the input terminals. 

Buffer is usually an emitter follower used
for impedance matching.

Output stage:- 

It consists of a push-pull complementary amplifier, which provides large A.C. output voltage swing and high current sourcing and sinking along with low output
impedance.

11. Realize the logic functions: Sum S= A+B and Carry CY =AB using gates and prepare the truth table.

A.

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Truth table:

ABSUM(S)=A+BCarry(CY)=AB
0000
0110
1010
1111
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