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Title: Electronics Mock Papers
Description: Compilation of semester exam level questions in Electronics on the 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 approximate, bulk resistance, DC load line, half-wave, full-wave, and bridge rectifier, transformer, capacitor-input filter, clippers and limiters, clampers, voltage multipliers, Zener diode, Schottky diode. BJT - collector, base, and emitter curves, current gain, load line, operating point, saturation, emitter bias, voltage-divider bias, two-supply emitter bias, other biases, PNP transistors, diode AC resistance, CE amplifier, T and π models, voltage gain, input impedance, swamping, multistage amplifier, CC amplifier, output impedance, cascading, Darlington connection, CB amplifier, class-A power amplifier, class-B push-pull emitter follower, class-AB driver, DC and AC differential amplifier, common-mode gain, current mirror, frequency response, decibel power and voltage gains, impedance matching, bode plots. JFET - drain and transconductance curves, biasing in Ohmic and active regions, JFET amplifiers and analog switches. OP-AMP - IC 741, inverting and non-inverting amplifiers, summer and voltage follower, negative feedback, VCVS, ICVS, VCIS, and ICIS amplifiers, bandwidth and slew rate, low-pass, high-pass, bandpass, bandstop, and all-pass filters, comparators, hysteresis, integrator, waveform converter and generator, differentiator, Wien-bridge oscillator, 555 timer, astable and monostable multivibrator. DIGITAL ELECTRONICS - Logic gates, Boolean algebra, Karnaugh maps, flip-flops, shift registers, adders, counters, analog to digital converters and digital to analog converters.
Description: Compilation of semester exam level questions in Electronics on the 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 approximate, bulk resistance, DC load line, half-wave, full-wave, and bridge rectifier, transformer, capacitor-input filter, clippers and limiters, clampers, voltage multipliers, Zener diode, Schottky diode. BJT - collector, base, and emitter curves, current gain, load line, operating point, saturation, emitter bias, voltage-divider bias, two-supply emitter bias, other biases, PNP transistors, diode AC resistance, CE amplifier, T and π models, voltage gain, input impedance, swamping, multistage amplifier, CC amplifier, output impedance, cascading, Darlington connection, CB amplifier, class-A power amplifier, class-B push-pull emitter follower, class-AB driver, DC and AC differential amplifier, common-mode gain, current mirror, frequency response, decibel power and voltage gains, impedance matching, bode plots. JFET - drain and transconductance curves, biasing in Ohmic and active regions, JFET amplifiers and analog switches. OP-AMP - IC 741, inverting and non-inverting amplifiers, summer and voltage follower, negative feedback, VCVS, ICVS, VCIS, and ICIS amplifiers, bandwidth and slew rate, low-pass, high-pass, bandpass, bandstop, and all-pass filters, comparators, hysteresis, integrator, waveform converter and generator, differentiator, Wien-bridge oscillator, 555 timer, astable and monostable multivibrator. DIGITAL ELECTRONICS - Logic gates, Boolean algebra, Karnaugh maps, flip-flops, shift registers, adders, counters, analog to digital converters and digital to analog converters.
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1
...
c load line for the circuit given below
...
Calculate the voltage at the collector (Vc) and base (Va) of the transistor
...
(b) Calculate the input and output impedance and a
...
(c) If the switch S1 is closed, calculate the input impedance and voltage gain
...
c voltage gain when the switch S2 is
[10]
also closed?
+5V
1kO
100kQ
Vout
itw
lkO
R
1kQ
2
...
Assume the voltage drop across
the diode is 0
...
c resistance of the diode re = 25 mV/La (mA)
...
7 V
...
(a) Prove that the maximum stage efficiency for class Bpush-pull emitter follower ~73%
...
5W
...
c
...
c
...
[3 +2]
4
...
Calculate the range of R, for the transistor
(Q:1) to remain inthe active region
...
Zener voltage Vz = 4V and take
I=2 mA, 1, =5 mA, VEB, = 0
...
For the class Aamplifier in figure below,draw the d
...
c load line
...
c compliance of the circuit
...
Assume Bde =200
...
7KS2
C
...
22 uF
Vout
V
Speaker
6852
1
...
5 x 10 = 5]
Q1
...
() In the NPN transistor
(a)the current carrier is the hole
(c) both Junctions are forward biased
(b) the current carrier is the electron
(d) both Junctions are reverse biased
(ii)In a junction transistor,
(a)The Collector region is made narrower than the other two regions
(b) the emitter region is made narrower than the other two regions
(c) the base region is made narrower than the other two regions
(d) Allthree regions are having the same thickness
In acommon emitter amplifier
(a) both PN Junctions are forward biased
(b) 180 degree phase shift between input and output
(c) 90 degree phase shift between input andoutput (d) Ophase shift between input andoutput
In acommon collector amplifier
(a) both PN Junctions are forward biased
(b) the output is taken from the collector
(c) Ophase shift between input and output
(d) 180 degree phase shift between input and output
(iv) If the peak voltage of a full wave rectifier is 10V,the average DC value is
(a) 10v
(b)6
...
18 V
(d) 5V
(V) If a12 Vzener diode has a power rating of 400 mW, then the maximum allowable current is
(a) 40 mA
(b) 44
...
3 mA
(d) 30 mnA
(vi) When the output signal tends to reduce the input signal, we use the term
(a) negative oscillation (b) recombination (c) negative gain (d) negative feedback
(vii)The equation for the dc load line of a transistor in common emitter configuration is
(a) IçRc+ VBE = Vcc
(b) Ic/Rc+ VBE=Vcc (c) IcRc + Vce = Vcc
(d) IçRc + VBc= Vcc
(viii)In the adjacent circuit, the current through the transistor is
(a) 50mA
(b) 43 mA
(c) 48mA
(d) 6 mA
+5V
100 2
(ix) The input control parameter of an FET is the
(b) drain voltage
(a) source voltage
(c) gate current
(d)gate voltage
Q2
...
The resistance of
the thermistor is 20 k2 at 00C and the resistance decreases
linearly by 20092 for each degree rise
...
8 k2 at 1 oC and so on
...
Sketch the output of the following circuits, Give brief reasons for your answer
...
In the adjacent circuit, the Ipss of the FET is100 uA
...
It is observed that when
VcoN =- 4 V, the output voltage is 480 mV
...
The current through the FET follows the equation
Vout
+
Vin
Vcon
Ip = Ipss 1
Vcs
VGs(of)
[5]
R
Q5
...
The capacitor charging formula is given as Vc= V +
(V,-V)1-e RC where Ve, VË and V, are the capacitor
voltage and the initial and final voltage respectively
...
RT
[5)
Q6
...
Calculate
the values of the resistance and capacitance necessary for its monostable operation and describe your
(5]
answer with the internal architecture of 555
...
An oscillator of frequency 1 kHz and a frequency counter that counts the pulses
from the oscillator are available
...
Explain briefly the working principle of your circuit
...
(a) Draw the circuit diagram of a 4-bit analog to digital converter using op-amp
...
approximation method
...
Further, digital pin-7 of the arduino is
configured as an input and is used for the decision making by reading the output from the A-to-D
Converter
...
[5]
Vin
Pin7 e
8
Pin6
Pin5
Pin4
pin3
Analog to Digital
D3
D2
D1
DO
Converter
Title: Electronics Mock Papers
Description: Compilation of semester exam level questions in Electronics on the 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 approximate, bulk resistance, DC load line, half-wave, full-wave, and bridge rectifier, transformer, capacitor-input filter, clippers and limiters, clampers, voltage multipliers, Zener diode, Schottky diode. BJT - collector, base, and emitter curves, current gain, load line, operating point, saturation, emitter bias, voltage-divider bias, two-supply emitter bias, other biases, PNP transistors, diode AC resistance, CE amplifier, T and π models, voltage gain, input impedance, swamping, multistage amplifier, CC amplifier, output impedance, cascading, Darlington connection, CB amplifier, class-A power amplifier, class-B push-pull emitter follower, class-AB driver, DC and AC differential amplifier, common-mode gain, current mirror, frequency response, decibel power and voltage gains, impedance matching, bode plots. JFET - drain and transconductance curves, biasing in Ohmic and active regions, JFET amplifiers and analog switches. OP-AMP - IC 741, inverting and non-inverting amplifiers, summer and voltage follower, negative feedback, VCVS, ICVS, VCIS, and ICIS amplifiers, bandwidth and slew rate, low-pass, high-pass, bandpass, bandstop, and all-pass filters, comparators, hysteresis, integrator, waveform converter and generator, differentiator, Wien-bridge oscillator, 555 timer, astable and monostable multivibrator. DIGITAL ELECTRONICS - Logic gates, Boolean algebra, Karnaugh maps, flip-flops, shift registers, adders, counters, analog to digital converters and digital to analog converters.
Description: Compilation of semester exam level questions in Electronics on the 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 approximate, bulk resistance, DC load line, half-wave, full-wave, and bridge rectifier, transformer, capacitor-input filter, clippers and limiters, clampers, voltage multipliers, Zener diode, Schottky diode. BJT - collector, base, and emitter curves, current gain, load line, operating point, saturation, emitter bias, voltage-divider bias, two-supply emitter bias, other biases, PNP transistors, diode AC resistance, CE amplifier, T and π models, voltage gain, input impedance, swamping, multistage amplifier, CC amplifier, output impedance, cascading, Darlington connection, CB amplifier, class-A power amplifier, class-B push-pull emitter follower, class-AB driver, DC and AC differential amplifier, common-mode gain, current mirror, frequency response, decibel power and voltage gains, impedance matching, bode plots. JFET - drain and transconductance curves, biasing in Ohmic and active regions, JFET amplifiers and analog switches. OP-AMP - IC 741, inverting and non-inverting amplifiers, summer and voltage follower, negative feedback, VCVS, ICVS, VCIS, and ICIS amplifiers, bandwidth and slew rate, low-pass, high-pass, bandpass, bandstop, and all-pass filters, comparators, hysteresis, integrator, waveform converter and generator, differentiator, Wien-bridge oscillator, 555 timer, astable and monostable multivibrator. DIGITAL ELECTRONICS - Logic gates, Boolean algebra, Karnaugh maps, flip-flops, shift registers, adders, counters, analog to digital converters and digital to analog converters.