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Electronics Mock Papers
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  • Course
  • Electronics
  • Institution
  • Electronics
  • Book
  • Electronic Principles

Compilation of semester exam level questions in Electronics on following topics. INTRODUCTION - approximations, Thevenin’s theorem, Norton’s theorem. SEMICONDUCTORS - intrinsic and extrinsic semiconductors, doping, forward and reverse bias, breakdown, barrier potential. DIODES - ideal and ap...

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Document information

  • May 7, 2023
  • 5
  • 2022/2023
  • Other
  • Unknown

Subjects

  • semiconductor
  • diode
  • transistor
  • biasing
  • common emitter
  • common collector
  • common base
  • darlington
  • op amp
  • differential
  • feedback
  • filter
  • jfet
  • mosfet
  • gate
  • karnaugh
  • boolean
  • adder
  • counter
  • register
  • adc
  • dac

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  • Electronics
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1. (a) Draw the d.c load line for the circuit given below. Mark the Q-point on the load line at collector current
1mA. Calculate the voltage at the collector (Vc) and base (Va) of the transistor. Complete the voltage
divider biasing by calculating resistance R using Bof the transistor =100.
(b) Calculate the input and output impedance and a.c voltage gain of the circuit when switch S1 and S2
both are open.
(c) If the switch S1 is closed, calculate the input impedance and voltage gain.
(d) Keeping the switch S1 closed, what would be the total circuit a.c voltage gain when the switch S2 is
also closed? [10]
+5V
1kO

100kQ

Vout
lkO
itw
R


1kQ




2. (a) Calculate and draw the output voltage for the circuit given below. Assume the voltage drop across
the diode is 0.7 Vand the a.c resistance of the diode re = 25 mV/La (mA). [2]
+12V


5 KS2
+20mV
Vin



-20mV
(b) For the circuit shown in Figure below, find current I and voltage V, assuming the voltage drop across
the diode is 0.7 V. [3]
+10v

10k(2
B


D, D,

A


5kS2



(-10V)



3. (a) Prove that the maximum stage efficiency for class Bpush-pull emitter follower ~73%.
(b) Class BPush-Pull amplifier has an efficiency of 60% andeach transistor has a rating of 2.5W. Find the
d.c. input power and a.c. output power. [3 +2]

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