Basic Electronic and DLD Important Questions – Past Papers

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

Paper 1: Basic Electronic DLD – University Past Papers.

Time Allowed: 3 hours Total Marks:    70, Passing Marks (35) Q.1 Fill in the blanks [14 Marks] a. The Component having the ability to store Electric Charges is known as —————————- b. The Unit of Voltage is _¬¬¬¬¬¬______. c. The__________is the same at all points in a Series circuit. d. Naturally Pure Semiconductor is known as —————————————. e. FET is a —————————————————– control Device. f. The reciprocal of Frequency is called —————————————————–. g. An Practical Current Source has a _¬¬¬¬¬¬______ resistance. h. The Current divider Technique is only used in _¬¬¬¬¬¬______ circuits. i. (1111)2 = (——–)16 j. 1’s compliment of (1011 1110)2 ———————————). k. The Gray code of 10101101 is……………………………….. l. If all inputs of NAND-Gate are zero then the output of the NAND-Gate……………… m. RAM is ……………………………………….Memory n. Half Adder accept two Inputs and Produce ……………………….Outputs. Q.2. (a) Define Resistor, Capacitor and Inductor. (b) Explain Ohm’s Law in detail. (6+8) Q.3. (a) Briefly explain the Intrinsic and Extrinsic Semiconductor in detail. (b) Differentiate PNP and NPN Transistor? (7+7) Q.4. (a) Explain the Kirchhoff’s Voltage Law and Kirchhoff’s Current Law. (b)Write down the general Statement of Superposition, s Theorem. (7+7) Q.5. (a) Simplify the given expression using Boolean rules and/or Demorgan’s theorem. A (A + B) + (B + AA) (A + B) (b) Draw the logic Circuit of the given SOP and POS expressions (1) (2) (7+7) Q.6 Briefly Explain the function of Full Adder with the help of logic Circuit and Truth Table. . (14) Q.7 Define Multiplexer .Design and Explain 8 to 1 Line Multiplexer. (7+7) Q.8. Write short notes on any TWO of the following. (a) Encoder & Decoder (b) PN Junction Diode Application (c) RAM & ROM (7+7+7)  

Paper 2: Basic Electronic DLD – University Past Papers.

Time Allowed: 3 hours Total Marks:    70, Passing Marks (35) Q.1 Fill in the blanks [14 Marks] 1. The Material having large no of free electrons and current can easily flow in them is known as —-. 2. A Watt is unit of _¬¬¬¬¬¬______. 3. The__________is the same at all points in a parallel circuit. 4. Naturally Pure Semiconductor is known as —————————————. 5. BJT is a —————————————————– control Device. 6. The reciprocal of time period is called —————————————————–. 7. An Ideal Current Source has a _¬¬¬¬¬¬______ resistance. 8. The Voltage divider Technique is only used in _¬¬¬¬¬¬______ circuits. 9. (1111111)2 = (——–)8 10. 2’s compliment of (1011 1110)2 ———————————) . 11. The Gray code of 10101101 is……………………………….. 12. If all inputs of NOR-Gate are zero then the output of the NOR-Gate……………… 13. Rom is ……………………………………….Memory 14. Half Adder accept ……………….Inputs. Q.2. (a) Define Resistor, Capacitor and Inductor. (6+8) (b)Differentiate Conductor, Insulator and Semiconductor with the help of Energy band Diagram Q.3. (a) Briefly explain the Intrinsic and Extrinsic Semiconductor in detail. (b) Differentiate BJT and FET? (7+7) Q.4. (a) Explain the Voltage Divider and Current Divider Technique. (b)Write down the general Statement of Thevenin, s Theorem. (7+7) Q.5. (a) Simplify the given expression using Boolean rules and/or Demorgan’s theorem. (7+7) A (A + B) + (B + AA) (A + B) (b) Draw the logic Circuit of the given SOP and POS expressions (1) (2) Q.6 Briefly Explain the function of 3 to 8 Line Decoder with the help of logic Circuit and Truth Table. . (14) Q.7 Differentiate between Encoder & Decoder. Design 1-8 Lines De-Multiplexer. (7+7) Q.8. Write short notes on any TWO of the following. (a) JK Flip Flop (b) PN Junction Diode (c)Digital Registers (7+7)

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