Download VTU B-Tech/B.E 2019 June-July 1st And 2nd Semester 17 Scheme 17ELN15 Basic Electronics Question Paper

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17ELN 15/25

First/Second Semester B.E. Degree Examination, June/July 2019

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Basic Electronics

Time: 3 hrs.

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Max. Marks: 100

Note: Answer any FIVE full questions, choosing ONE full question from each module.

Module-1

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1. a. What is PN junction diode? With the help of circuit diagram, explain the VI characteristics of a diode. (07 Marks)
2. b. What is rectifier circuit? Explain the classification of the rectifier. Derive the following expressions for Half-wave rectifier: (i) Id (ii) Irms (iii) Vdc (iv) Vrms (08 Marks)
3. c. Design a Zener diode voltage regulator circuit to meet the following specifications: IL = 20 mA, Vo = 5V, Pz = 500 mW, Vi = 12 ± 2V and Izmin = 8 mA. (05 Marks)

OR

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1. a. What is a transistor? What are its applications? Explain the various current gains in a transistor and derive the relation between a and ß. (07 Marks)
2. b. With a neat circuit diagram, explain the input and output characteristics of the common emitter configuration. (08 Marks)
3. c. Explain the operation of full wave rectifier with capacitor filter. (05 Marks)

Module-2

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1. a. For the base bias circuit, Vcc = 18V, Rc = 2.2 KO, RB = 470 KO and ß = 100. Find IB, Ic and VcE. Draw the DC load line and locate the operating point. (07 Marks)
2. b. Draw the circuit diagram of the voltage divider biasing circuit. Derive the expressions of Ic and Vce. (08 Marks)
3. c. List out the various ideal op-amp characteristics. Explain the terms CMRR and Slew rate. (05 Marks)

OR

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1. a. Derive the output equation of the inverting adder. Design an adder op-amp circuit to obtain an output voltage = -(0.1V1 +0.5V2 + 20V3 ). Select Rf= 10 KO. (07 Marks)
2. b. What is an integrator? Derive its output equation. (05 Marks)
3. c. Derive the output expressions for the following op-amp applications: (i) Voltage follower (ii) Subtractor (08 Marks)

Module-3

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1. a. What are Radix-2, Radix-8, Radix-10 and Radix-16 number system? Perform the following operations:
   i) (1234.56)8 = (?)10
   ii) (BAD.DAD)16 = (?)8
   iii) (988.86)10= (?)16 (08 Marks)
2. b. Perform the following using 2's complement method:
   

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   i) (15)10 - (28)10
   ii) (1011.10)2 - (0000.00)2 (05 Marks)
3. c. Write the symbol and truth table of the following gates:
   i) AND
   ii) NOR
   

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   iii) XOR
   iv) NAND (07 Marks)

OR

1. a. Simplify and realize the following Boolean expressions using basic gates:
   

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   i) Y=ABC+ABC+AB+AB
   ii) Y = ABC + ABC + AB+ ABC
   iii) Y = (A+B)(A +C)(B+C) (08 Marks)
2. b. Implement XOR gate using only NOR gates. (05 Marks)
3. c. Write truth table of half-adder and full-adders. Realize the full-adder using two half-adders. (07 Marks)

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Module-4

1. a. What is flip-flop and latch? Explain the operation of SR latch using NAND gates. (07 Marks)
2. b. Explain the working of clocked SR flip-flop with a suitable logic diagram and a truth table. (08 Marks)
3. c. Explain the working of NAND gate latch and NOR gate latch. (05 Marks)

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OR

1. a. What is microcontroller? List out the main features of 8051 microcontroller. (05 Marks)
2. b. With a neat block diagram, explain the architecture of 8051 microcontroller. (09 Marks)
3. c. What is stepper motor? Explain the working and interfacing of stepper motor to a 8051 microcontroller. (06 Marks)

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Module-5

1. a. What is amplitude modulation and frequency modulation? With the help of neat waveform, derive the expression for AM wave. (07 Marks)
2. b. A carrier signal with Ac = 40 V and f = 1 MHz is amplitude modulated with a modulating signal Am = 4V and fm = 2.5 kHz. The depth of the modulation is 75%. Calculate the following: (i) Pc (ii) PT (iii) Psideband (iv) BW (v) Sideband frequencies. Assume R = 50O.(07 Marks)
3. c. What is demodulation? Explain the working of AM detector circuit. (06 Marks)

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OR

1. a. What is transducer? Explain the working of resistance transducer and resistance thermometer. (07 Marks)
2. b. What is LVDT? Explain the construction, operation and applications of LVDT. (07 Marks)
3. c. Explain the working of piezoelectric and photoelectric transducers. (06 Marks)

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