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Explain with gate symbol. (10) 3. (a) Explain the function of Full Adder circuit. (10) (b) State and prove Demorgan’s law with truth tables. (10) 4. (a) Simplify the function : F ( x, y, z ) = ∑ (0, 1, 3, 6, 7) . (10) (b) Using Demorgan’s theorem, show that : (i) ( A + B )′ ( A ′ + B ′) = 0 (ii) A + A ′B + A ′B ′ = 1 . (a) Define Flip-flop. (10) 6.

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(a) What is meant by an Overflow? Is it a Software problem or hardware problem? (10) (b) State and prove De Morgan’s theorems. (10) 3. (a) What are the applications of Boolean Algebra. (10) (b) How does OR addition differ from the ordinary addition method? (10) 4. (a) ( ) Implement Y = AB + A + B + C using NAND gates only. (10) 5. (a) What is a Flip-Flop? What is its function?

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7. (a) Briefly explain about NAND gate and XOR gate with truth table and **Circuit** diagram. (b) Explain the working of transistor as switch. 8. (a) Discuss in detail about the half subtractor with example. (b) Explain number system with appropriate examples.

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(10) (b) Explain the process of achieving breakdown in zener diode. (10) 2 WK 4 8. (a) Give short note about (i) Photo diode (ii) Operational amplifier applications. (10) (b) With suitable diagram, explain the structure and the operation of N-channel FET.

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Right and left. 5. (a) Write a summary about asynchronous counter and synchronous counter. (b) Explain details about pn diode and characteristics. 6. (a) Briefly explain about FET, JFET and MOSFET. (b) Explain details about op-amp characteristics. 7. (a) Distinguish between UJI and SCR. (b) Explain about application of Op-Amp. 8. (a) Explain details about review of amplifier and oscillator. (b) Discuss about gray code and ASCII code.

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(a) Prove the following equations using Boolean Algebra : (i) AB + ABC + A B + AB C = B + AC . (5) Ws5 (ii) ( A + B ) (A + C ) = AC + A B . (5) (b) Write in detail about decimal adder. (10) 5. (a) Explain in detail about JK Flip Flop. (10) (b) Describe the Shift Counters in detail. (10) 6. (a) Design a mod-15 ripple counter and draw the truth table. (10) 7. (10) 8.

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(5) (a) Using logic gates draw the full adder **Circuit** and explain its function with truth table. (10) (b) Draw the three variable Minterm Karnaugh map and explain it? (10) (a) Explain the function of J-K flip flop with truth table. (10) (b) Explain the function of ring counter. (10) (a) Explain the VI characteristics of a pn junction diode with suitable diagram. (10) (b) With a neat diagram explain the working function of SCR.

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**Paper**101

(i) 445. (ii) 178. 5. (a) Explain about the working principle of half adder with **Circuit** diagram. (b) Write short notes on synchronous counters. 6. (a) Perform binary addition on the following : (i) 1010 + 1111 1 # wk3 (ii) 23 + 48. (b) Write short note on breakdown diode. 7. (b) Explain Boolean theorem with examples.

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)16 (iv) (423)10 → ( ? )2 (10) (a) Explain ASCII and BCD codes with suitable example. (10) (b) (i) Add (1011)2 with (1101)2 (ii) Subtract 29–10 using 2’s complement. (iii) Write (–12)10 into signed binary number (iv) Subtract (0110)2 from (1011)2. (10) (a) Explain how the transistor acts as a switch. (10) (b) Draw the logic symbol for AND, X-OR, NAND and explain with truth table.

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**Paper**12

Write briefly about (a) Half Adder (10) (b) Half Subtractor. (10) 4. (a) What is flip flop? With neat sketch and truth table explain the J-K flip flop. (10) (b) Write short notes on shift register. (10) 5. Write briefly about the working principle of P-N Diode and its characteristics. (20) 1 DE–262 6. Discuss briefly about (a) Operation of N-channel JFET.

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