# ANALOG ELECTRONICS EE-202-F IMPORTANT QUESTIONS

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1 ANALOG ELECTRONICS EE-202-F IMPORTANT QUESTIONS 1].Explain the working of PN junction diode. 2].How the PN junction diode acts as a rectifier. 3].Explain the switching characteristics of diode 4].Derive the expression for the ripple factor in case of half wave and full wave rectifier. 5].Explain the operation of the voltage doubler circuit. 6].With the help of circuit diagram explain the working of full wave bridge rectifier. 7].Explain the V-I characteristics of PN junction diode. 8].What is the difference between clipper and clamper circuits 9].Explain the load line analysis of the diode 10].What is static and dynamic resistance of diode 11].Explain the need for biasing the BJT 12].Explain transistor RC coupled amplifier with reference to frequency response, advantages, disadvantages and applications 13].Draw and explain the input and output characteristics of CE configuration. 14].What is stability factor? Derive the expression for stability factor of self bias method of transistor biasing. 15].A transistor with β = 100 is used in CE configuration. The collector circuit resistance is Rc = 1KΩ and Vcc = 20V. Assuming VBE = 0, find the value of collector to base resistance, such that quiescent collector emitter voltage is 4 V. 16].Derive the expression for CE short circuit current gains A i as a function of frequency. 17].Explain Hybrid π model of transistor. 18].Define Pinch-off voltage, amplification factor and Tranconductance of FET. Explain with a circuit diagram how an FET is used as a VVR (Voltage Variable Resistance) 19].Explain construction and working of V-MOSFET. 20].Explain series and shunt voltage regulator 21].A BJT has hie = 2 KΩ, hfe = 100, hre = 2.5 x 10-4 and hoe = 25μA/V as parameters in CE configuration. It is used as an emitter follower amplifier with Rs=1KΩ and RL = 500Ω.

2 Determine for the amplifier the voltage gain, the current gain, the input resistance R i and output resistance R o. 22].The load resistance of a centre-tapped full-wave rectifier is 500Ω and the necessary voltage is 60 sin (100πt). Calculate (i) Peak average and rms values of current (ii) Ripple factor Q (iii) efficiency of the rectifier. Each diode has an idealized I-V characteristics having slope corresponding to a resistance of 50 Ω. 23].Explain briefly filter circuits 24].Write short note on any two of the following: i) Thermistor and Sensister Compensation ii) Miller s Theorem iii) Peak to peak detector. 25].Explain the following terms with respect to Diodes :- i)breakdown Voltage ii)knee Voltage iii)peak Inverse Voltage iv) Forward & Reverse Resistance 26].Derive the expression for the average value of current in a half-wave Rectifier. 27].The Forward Resistance RF of a diode is 20 Ω. This diode is used in a Half wave Rectifier circuit. The applied Input voltage is v = 50 sinwf and load Resistance RL is 800 Ω. Determine :- i)im, Idc, Irms. ii)ac Power Input and DC Power output. iii)output DC voltage. iv)rectification efficiency. 28].A Centre Tap Full wave Rectifier has load resistance RL is1000 Ω. The RF of a diode is 20 Ω. The voltage across half of the secondary winding is given by the equation v = 200 sin 314t. determine : (i) Peak value of current (ii) Average or Qc value of current (iii)rms value of current (iv) Ripple Factor 29].Explain need for biasing G BJT. Draw a circuit of CE amplifier with n-b-n transistor, using self-biasing scheme and derive the expression for its stability factor. 30].Explain the small signal mode of an FET. 31].A transistor with B = 55 is to be used in self biasing circuit such that VCC =22.5V, Rc = 5.6 KΩ, RE = 1 KΩ, R2=10 KΩ, and R1= 90 KΩ,VBE = 0.6 V. The transistor operates in active region. Determine the Q-point & transistor and stability factor. 32].Explain R-C coupled amplifier with its frequency response.

3 33].Write short note on any two of the following : i)series and shunt voltage regulator.ii)peak to Peak detector. Iii)MOSFET 34].Discuss the necessity for a regulated power supply 35].Explain the operation of UJT 36].Explain the breakdown that occurs in the diode 37].Draw the block diagram of SMPS 38].What are the power supply parameters 39].What is the use of compensation network. Explain various types of compensated network 40].Explain miller theorem and its importance 41].Compare CE, CB and CC. 42].Draw the equivalent circuit of transistor at high frequency. 43].What are the capacitance associated at high frequency 44].Explain peak to peak detector 45].What is V-MOSFET. How it is different from other MOSFET 46].Explain the biasing for the FET circuit 47].Compare BJT and FET 48].Explain three terminal IC regulator ].Discuss the procedure to determine DC operating point by using load line. Why it is selected at the middle of the load line. 50].Explain why inductor filter is not used in case of half wave rectifier. 51].Find an expression for the output V o of the amplifier circuit of Fig below. Assume an ideal op amp. What mathematical operation does the circuit perform? 52].In the circuit of Fig shown, the differential amplifier has infinite gain, infinite input impedance and negligible output impedance. Derive an expression for the circuit s transfer function

4 Z 2 - V i Z 1 + V 0 53].Show that the input impedance of the circuit in Fig. is given by: Z IN I V R1R 2R 2 1 j CR 2 R I + - R R R R 2 C V R 54].The FET circuit given below in Fig, has R1=3.5MΩ, R2 = 1.5MΩ, RS = 2KΩ, RL = 20KΩ and gm = 2.5mS. Find its input impedance, output impedance and voltage gain. 55].In an amplifier with negative feedback, the gain of the basic amplifier is 100 and it employs a feedback factor of If the input signal is 40mV, determine (i) voltage gain with feedback and (ii) value of output voltage.

5 56].A half-wave rectifier has a load resistance of 3.5 K_. If the diode and secondary of the transformer have a total resistance of 800K_ and the ac input voltage has 240 V (peak value), determine: a) peak, rms and average values of current through load b)dc power output c)ac power input d) rectification efficiency 57].A BJT has a base current of 250 μa and emitter current of 15mA Determine the collector current gain and β. 58].In the circuit shown in Fig, [IDSS] = 4mA, VP = 4V. Find the quiescent values of 1D, VGS and VDS of the FET. 59].A negative feedback of β= 2.5 x 10-3 is applied to an amplifier of open loop gain Calculate the change in overall gain of the feedback amplifier if the gain of the internal amplifier is reduced by 20%. 60].The input to an op-amp differentiator circuit is a sinusoidal voltage of peak value 10µV and frequency of 2 khz. If the values of differentiating components are given as R = 40 k ohm and C =3µF. Determine the output voltage. 61].Find the values of collector and emitter currents in a transistor having ICBO=3μA, and Idc=0.98 when its base current is 60μA. 62].In the differential amplifier circuit shown below, the transistors have identical characteristics and their β=100.determine the (i) output voltage (ii) the base currents and (iii) the base voltages taking into account the effect of the RB and VBE. Take VBE=0.7 Volts.

6 63].Define diffusion capacitance of a pn junction diode. Obtain an expression for the same.why is the diffusion capacitance negligible for a reverse biased diode? 64].Draw a neat sketch to illustrate the structure of an N-channel E-MOSFET. Explain its operation. 65].Show that in an amplifier, the gain reduces if negative feedback is used. 66].In a voltage series feedback amplifier, show that the input impedance increases with negative feedback. The output impedance decreases due to negative feedback. 67].Derive mathematical expressions to illustrate the effects of negative feedback (i) to improve gain stabilization (ii) to reduce distortion (iii) to modify input and output impedances. 68].Explain how op-amp can be used as a i) Differentiator (ii) Integrator iii) Inverting amplifier (iv) Summer 69].Sketch the volt-ampere characteristics of zener diode. Indicate the knee on the curve and explain its significance. What happens when the current in zener decreases below the knee current? 70].Draw the circuits of the various transistor configurations. Why common emitter configuration is mostly used? Give its typical uses. 71].What is transistor biasing? What are the basic conditions which are to be necessarily fulfilled for achieving faithful amplification of input signal in transistor amplifiers? 72].What are the advantages of the FET over a conventional bipolar junction transistor? Define pinch off voltage, transconductance, amplification factor and drain resistance of a

7 FET. Explain with the help of circuit diagram how an FET is used as a voltage amplifier and as voltage dependent resistor (VDR). 73].Discuss the terminal properties of an ideal operational amplifier. 74].What is an ideal diode? Sketch the characteristics of an ideal diode. 75].Draw a block diagram of a single loop feedback amplifier, and explain the function of each block. What are the characteristics of an amplifier that are modified by negative feedback? For the four topologies of negative feedback, indicate whether the input impedance and out impedance increase or decrease as a result of feedback. 76].What is an integrator? Derive the formula for its output voltage. Explain its working with neat and clean waveform i) In case of square wave input ii) In case of sine wave input. Derive the formula for summing amplifier and on averaging amplifier in non Inverting configuration. 77].Draw the block schematic of a typical operational amplifier and briefly explain the function of each block. Also give the equivalent circuit of the opamp. 78].Sketch the circuit of a bridge rectifier and describe its operation. Derive expressions for rectification efficiency and ripple factor of the circuit. If a capacitor is added to the circuit, show the output voltage waveform of the rectifier. 79].What is Early effect? Explain how it affects the characteristics of BJT in CB configuration. 80].Draw the circuit of common source amplifier using JFET and show its equivalent circuit. Analyse the equivalent circuit to find an expression for voltage gain and output resistance. 81].Show an FET source follower circuit. What type of negative feedback takes place in the circuit? Analyse the circuit to derive an expression for voltage gain with feedback. 82].Why filters are used along with rectifiers in the construction of a power supply? List the filter types used in power supplies. Explain their effect on rectifier output waveforms. 83].A single-phase full-wave rectifier uses two diodes, the internal resistance of each being 20 ohm. The transformer rms secondary voltage from centre tap to each end of secondary is 50V and load resistance is 980 ohm. Find (i) the mean load current. (ii) rms load current and output efficiency. 84].Explain full wave voltage Tripler circuits in detail with diagram

8 85].What gain bandwidth product is important in the analysis of an amplifier. How gain affects the bandwidth of an amplifier. 86].Draw the small signal and high frequency model of MOSFET. 87].What is the effect of finite open loop gain and bandwidth on op-amp. 88].Explain differential amplifier with active load. 89].Draw and explain the frequency response of CE amplifier. What do you mean by 3dB bandwidth on the frequency response. 90].Draw and explain the circuit for MOS differential pair. Compare it with BJT differential pair. 91].What is the difference between AC and DC load line in case of transistor Analysis. 92].What is the concept of Virtual ground in op-amp. Why it is important. 93].Why the input impedance of Op-amp is very high. What is the advantage of high input impedance. 94].Enlist the advantages and disadvantages of Full wave centre tap and bridge rectifier. Which is practically used mostly. 95].Compare the negative feedback topologies in amplifier. 96].Draw and analyse MOS differential pair by using H parameters. 97].Draw and explain the frequency response of CS amplifier. What do you mean by 3dB bandwidth on the frequency response 98].Half wave rectifier is a clipper circuit. Justify this statement. 99].Define V Sat voltage in Op-Amp. Why it is important to define. 100].Find the output of given circuit with explanation. Assume input is sine wave and diode is ideal

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