Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Choose the correct answer:
1 (a) (i) Zener diode can be used for rectification. This statement is:
a) True
b) False
c) Neither true nor false
d) None of these
1 M
1 (a) (ii) PIV in case of half wave rectifier for all input signal Vmsinωt is:
a) Vm
b) 2Vm
c) Vm/2
d) Vm/√2
1 M
1 (a) (iii) If frequency of input is 60 Hz for a full wave rectifier, the frequency of ripple is
a) 30 Hz
b) 60 Hz
c) 120 Hz
d) 180 Hz
1 M
1 (a) (iv) If a peak to peak voltage is 4V then RMS voltage is:
a) √2 Volt
b) 2 Volt
c) 2.82 Volt
d) Both A&C
1 M
1 (b) Calculate the reverse saturation current for silicon diode which passes a current of 10mA at 27°C, for a forward bias of 700mV.
4 M
1 (c) Explain the effect of temperature on the diode characteristics and also on the power rating of the diode.
6 M
1 (d) Explain the operations of a full wave center tap rectifier with neat circuit diagram and wave forms?
5 M

Choose the correct answer:
2 (a) (i) Bipolar junction transistor is a _____ controlled device.
a) Voltage
b) Current
c) Power
d) Temperature
1 M
2 (a) (ii) Operating point must be _____ for proper functioning of transistor.
a) Increasing
b) Decreasing
c) Stable
d) High
1 M
2 (a) (iii) The DC load line of a transistor is a:
a) Curved line
b) '-'ve slope line
c) '+' ve slope line
d) Zero slope line
1 M
2 (a) (iv) In a transistor α and β are related by:
a) α=1/(1-β)
b) α=β/(1+β)
c) β=α/(1-α)
d) β=1/(1-α)
1 M
2 (b) Explain the characteristics of common base transistor configuration with neat circuit diagram.
8 M
2 (c) What is a DC load line? Explain with a fixed bias circuit diagram.
4 M
2 (d) For the fixed bias circuit shown in the figure, VBE=0.7V, β=60,
i) Quiescent values of base and collector currents
ii) Quiescent value of VCE
iii) Base-ground and collector ground voltages
iv) Base-collector voltage
4 M

Choose the correct answer:
3 (a) (i) In voltage divider bias circuit RE is used for:
a) Stabilization
b) As a load
c) As a bypass element
d) All of these
1 M
3 (a) (ii) For exact analysis of voltage divider circuit _______ theorem is used
a) Norton's
b) Thevenin's
c) Superposition
d) Any one of these
1 M
3 (a) (iii) _____ is the linear region of transistor characteristics.
a) Saturation
b) Cut-off
c) Active
d) Both A&C
1 M
3 (a) (iv) Stability factor of fixed bias circuit is,
a) β
b) β-1
c) 1+β
d) None of these
1 M
3 (b) List the factors which affect the stability of operating point.
4 M
3 (c) With a neat circuit diagram, explain voltage divider biasing circuit and derive the expression for VCE and IC using exact analysis.
8 M
3 (d) For the circuit shown in the figure using Silicon transistor with VBE=0.7V and β=80, find VCE and VB
4 M

Choose the correct answer:
4 (a) (i) The device which has wide application in pulse generation is:
a) FET
b) BJT
c) Diode
d) UJT
1 M
4 (a) (ii) The FET is a _____ controlled device.
a) Current
b) Voltage
c) Power
d) Temperature
1 M
4 (a) (iii) The device which is known as a thyristor is:
a) Diode
b) FET
c) Transistor
d) SCR
1 M
4 (a) (iv) In FET the gate source junction is:
a) Forward biased
b) Reverse biased
c) Unbiased
d) None of these
1 M
4 (b) Explain the working of FET with neat circuit diagram and relevant characteristics. Indicate each region of characteristics.
8 M
4 (c) Explain the working of UJT with neat circuit diagram. Indicate all regions in the characteristics.
8 M

Choose the correct answer:
5 (a) (i) The coupling capacitors in RC couple amplifier affect _____ frequency response
a) Low
b) High
c) Very high
d) Above 100 kHz
1 M
5 (a) (ii) The frequency at which oscillator will operate is the frequency for which the phase shift of the loop gain is:
a) 0°
b) 360°
c) 180°
d) Both A&B
1 M
5 (a) (iii) In an oscillator the phase shift produced by amplifier is:
a) 0°
b) 180°
c) 90°
d) 270°
1 M
5 (a) (iv) The oscillator used to generate oscillations in audio frequency range is:
a) LC oscillator
b) RC oscillator
c) Crystal oscillator
d) Both A&B
1 M
5 (b) Explain the working of RC phase shift oscillator with neat circuit diagram and waveforms at each stage.
8 M
5 (c) List the effects of negative feedback.
4 M
5 (d) In a transistor Hartley oscillator, L1=10µH, L2=10µH. Find the value of C required for an oscillating frequency of 150 kHz, take M=0.
4 M

Choose the correct answer:
6 (a) (i) An op-amp has _____ output impedance.
a) ∞
b) 0
c) 10000Ω
d) 600Ω
1 M
6 (a) (ii) Voltage follower has _____ gain.
a) High
b) Low
c) Unity
d) None of these
1 M
6 (a) (iii) An op-amp non-inverting amplifier has R1=1k & Rf=3k when Vi=2V the output is:
a) - 4V
b) 4V
c) 8V
d) - 8V
1 M
6 (a) (iv) Op-amp configuration used as a buffer is:
a) Inverting amplifier
b) Non-inverting amplifier
c) Voltage follower
d) Adder
1 M
6 (b) List the characteristics of ideal op-amp and practical op-amp.
8 M
6 (c) The input to the op-amp shown in the figure 6.c., at the non-inverting terminal is 10 sin10t volts. Determine the output waveform indicating time period and maximum values.
4 M
6 (d) Find the output of the op-amp circuit shown in figure 6.d.
4 M

Choose the correct answer:
7 (a) (i) (100)10= (?)16
a) 64
b) 144
c) 46
d) 80
1 M
7 (a) (ii) 75 in binary contains _____ number of 1's.
a) 8
b) 4
c) 6
d) 3
1 M
7 (a) (iii) (16)8= (?)10
a) 18
b) 20
c) 14
d) 25
1 M
7 (a) (iv) (ABC)16= (?)10
a) 3000
b) 4230
c) 2748
d) 2250
1 M
7 (b) Perform the following:
i) (101110)2=(?)8
ii) (110011)2-(011001)2=(?)2
iii) (E10A2)16-(5FF1)16=(?)16
iv) (77721)8-(66432)8=(?)8
v) (2384)16=(?)8
5 M
7 (c) Explain the need for modulation.
5 M
7 (d) Explain the working of a super heterodyne receiver with neat circuit diagram and waveforms at each stage.
5 M

Choose the correct answer:
8 (a) (i) The EX-OR gate is which one input is connected to VCC, operates as _____ gate.
a) AND
b) OR
c) NOR
d) NOT
1 M
8 (a) (ii) The gate whose output 1's zero only when both the inputs are high is _____ gate.
b) NOR
c) OR
d) AND
1 M
8 (a) (iii) A+A'B+A is:
a) A
b) B
c) A+B'
d) A+B
1 M
8 (a) (iv) Universal gates are:
c) OR & NOR
1 M
8 (b) What is a half adder and implement it using universal gates.
6 M
8 (c) Simplify and realize the Boolean expression using two input NAND gates only.
10 M

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