Advanced Digital Electronics — DU B.Sc. (Prog.) Physical Science courses pertaining to Electronics Previous Year Question Papers

– NEP: UGCF-2022 Medium of setting the Question paper: English Language Attempt four questions in all. (a) State any three applications of CRO. (b) Differentiate between active and passive components with examples. (c) Convert (0.1001)2 into decimal equivalent. (d) Simplify the expression: 𝒀 = 𝑨. 𝑩 (e) The vertical deflection of a signal is 3.6 cm on a CRO and the volts/div setting is 1.5 V/div. Find the peak-to-peak voltage? (f) What is sampling in A–D conversion? 2. (a) Compare D–A and A–D converters in terms of function, applications, and key parameters. (b) Design a simple combinational logic circuit using PLA for the function: (c) Define an integrated circuit. Explain the terms wafer, chip, and monolithic IC. 3. (a) Explain the working of a decade counter. How does it differ from a 4-bit binary counter? (b) A TTL gate has 𝐼𝑂𝐻 = −400 𝜇𝐴, 𝐼𝐼𝐻 = 40 𝜇𝐴, 𝐼𝑂𝐿 = 16 𝑚𝐴, 𝐼𝐼𝐿 = −1.6 𝑚𝐴.Calculate fan-out for HIGH and LOW states. (c) What is meant by SSI, MSI, LSI and VLSI? Give basic definitions. (7, 5, 3) 4. (a) What is a monostable multivibrator? Explain its working with circuit diagram. Also draw a neat waveform. (b) Define resolution and accuracy of a DAC. Explain their significance in D–A conversion. (c) A logic gate draws 2 mA when output is HIGH and 4 mA when output is LOW. Calculate average power dissipation (assume 50% duty cycle) if supply voltage is 5V. 5. (a) (b) (c) Define PROM. Can it be used for implementing combinational circuits? Justify. What is speed-power product? Why is it considered a figure of merit for logic families? Explain the working of IC 555 in astable multivibrator mode in brief.