BSc Physics SEM VI ATKT 2018-19 ATKT Physics II Electronics 19 R Question Paper - Mumbai University | munotes

Questions asked in this paper

• (2) Figures to the right indicate full marks

1. Q1 (a) Attempt any one: (ij) the construction and working of SCR. Explain the working of half 10 wave rectifier using SCR as a rectifying device. Derive an for its DC output voltage and current
   • (ii) Explain the construction, working and V-I characteristics of TRIAC. 10
   • (b) Attempt any one: (ij) Explain the construction and working of n-channel enhancement mode 5
   • (i) An n-channel JFET has Ipss = 10 mA and = - 4V. Calculate the 5 gate source voltage and drain current at the half cut-off point
2. Q2 (a) Attempt any one:
   • (i) Draw circuit diagram of a transistorized astable multivibrator. With 10 the help of necessary waveforms explain its working and derive an expression for frequency of its output wave
   • (i) With the help neat circuit diagram, explain the working of zener follower 10 as series voltage regulator
   • (b) Attempt any one:
   • (i) with the help of neat circuit diagram, the ac analysis of an emitter 5 coupled differential amplifier with inverting input configuration and single ended output. Derive an expression for the ended output voltage
   • (i) Explain with neat circuit. diagram working of three LM317 5 voltage regulator. Derive an expression for its output voltage
3. Q3 (a) Attempt any one:
   • (i) Draw the circuit diagram of triangular wave generator using Schmitt 10 and integrator. Explain its working. State the expression for frequency of output triangular and square wave. Sketch the waveforms at output termmals of Schmitt trigger and integrator
   • (i) Draw the circuit diagram of free running multivibrator using IC 555. 10 Explain its working. Derive the expression for output time period. Explain how circuit can be modified to work as voltage to frequency converter Attempt any one:
   • (i). the diagram of first order active low pass filter in non-inverting 5 configuration. State the expression for cut-off frequency and pass band gain. Sketch the frequency response curve
   • (ii) . Draw the circuit diagram of Wein bridge oscillator using op-amp. 5 Calculate the output frequency if Ri= Ro= 2KQ and Ci=C2=0.047pF ED29AE1247B4DC6F8A832BE3E8CC40AA
4. Q4 (a) Attempt any one: (ij) Draw neat diagram of two inputs CMOS NAND gate and its 10 working. Write its truth table
   • (ii) | Explain with the help of neat block diagram, the general principles of radio 10 broadcasting, transmission and reception
   • (b) Attempt any one:
   • (i) the working of mod-3 counter with logic diagram. Write its truth 5
   • (ii) A carrier wave of 500 Watts is subjected to 80 % amplitude modulation. 5 Determine a) power in power of modulated wave
5. Q5 (a) Attempt any one: acurrent fusing rating of Determine the highest surge 4 current value that SCR can withstand. for a period of 20 msec
   • (i) The JFET has gmo= 6000 Ipss=12 mA. Find its drain. current at 4
   • (b) Attempt any one:
   • (i) Schmitt trigger circuit using discrete components has Vcc=12 V, 4 the values of switching levels and hysteresis voltage
   • (i) The differential amplifier with double ended input and single ended output 4 10KQ, Re = 6.8 KQ, If =.0.7 V for silicon transistor and Vi = 0 V. What is the dc emitter current in each silicon transistor? Find tail current and dc voltage at the output
   • (c) Attempt any one:
   • (i) A square wave generator using op-amp is designed to produce output 4 square wave of and If and Ri=2KQ, calculate
   • (ii). Calculate the output of log amplifier constructed using op-amp, for an 4 input of 100mV. Ri =1KQ , k=1.38 x and I; for diode Attempt any one:
   • (i) many flip flops are required to construct a mod-64 counter? What is 3 the largest decimal number that can be stored in a mod-64 counter?
   • (ii) A sinusoidal carrier voltage of frequency 1 MHz and amplitude 100 volts 3 is amplitude modulated by sinusoidal voltage of frequency 5 KHz producing 50 % modulation. Calculate the amplitude of lower and upper ED29AE1247B4DC6F8A832BE3E8CC40AA

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