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Important Questions for "Electronics":

[1]

  1. What is phase reversal in electronics?
  2. How do you calculate AC drain resistance for a JFET?
  3. How is voltage Va calculated in an SCR rectifier?

[2]

  1. What is the basic function of a decoder? Explain basic 3-input decoder with diagram.
  2. Using the Karnaugh Map method, minimize the given expression.
  3. Using the postulates of Boolean Algebra, simplify the given expressions.

[3]

  1. Describe the mode of working of an edge triggered S-R Flip Flop.
  2. What do you understand by virtual memory? Explain the basic organization and working methodology of virtual memory.
  3. Distinguish between Combinational and Sequential Circuits, Synchronous and Asynchronous Counter, and T flip flop and D flip flop. Provide suitable diagrams where necessary.

[4]

  1. Show that NAND gate is a universal gate.
  2. Explain the working of a decoder or a multiplexer.
  3. What is cache memory? Explain how it improves the throughput of a digital computer. What is 'Hit Ratio' with respect to cache memory? How many types of cache memories are available? Compare their relative merits and demerits.

[5]

  1. Design a 5-Mod Counter using JK flip-flops and implement it.
  2. With a neat block diagram, explain the function of an encoder. Also, explain priority encoders.
  3. Write short notes on any three of the following: EPROM, State table, Master-Slave Flip-Flop, Implementation of F(a, b, c) = (0, 6) using NAND and NOR gates.

[6]

  1. Minimize the Boolean function F(A,B,C,D) = m(0, 1, 2, 5, 7, 8, 9, 10, 13, 15).
  2. Differentiate between Decoder and Encoder, Half Adder and Full Adder, and ROM and PROM with examples.
  3. What is the function of a shift register? Explain its working with a diagram and discuss the different modes in which a shift register can operate.

[7]

  1. When does a page fault occur?
  2. Which algorithm chooses the page that has not been used for the longest time?
  3. Which device stores only one bit in a digital circuit?

[8]

  1. What is the necessity of having a filter in a power supply?
  2. Write notes on base-width modulation in a transistor.
  3. Draw the circuit diagram of a transformer-coupled transistor amplifier. Derive an expression for voltage gain at low, mid, and high frequencies.

[9]

  1. The primary constant of a transmission line are R, L, G, C.
  2. Explain the concept of geostationary satellites and their orbital distances.
  3. Explain Newton Raphson method and its applications.

[10]

  1. Discuss the Fermi level in intrinsic and extrinsic semiconductors.
  2. Explain the Kronig-Penny model. Derive the equation for the energy of an electron in one-dimensional periodic potential.
  3. Explain the working of tuned collector oscillator with circuit diagram and derive the equation for its frequency of oscillation.

[11]

  1. Write a short note on emitter follower circuit.
  2. Find out the expression for input impedance, output impedance, current gain, voltage gain and power gain in terms of h-parameters for CE amplifier.
  3. Simplify the given expressions using Boolean Algebra method.

[12]

  1. Convert hexadecimal number (49)16 to decimal equivalent.
  2. Explain the formation of barrier field across the p-n junction diode. Derive the equation for the width of depletion layer and height of potential barrier.
  3. Simplify the given expressions using Boolean Algebra method.

[13]

  1. What is Cache memory? Why is it needed?
  2. Discuss Half subtractor and define Boolean functions for outputs.
  3. Simplify Boolean functions through equations and K-map.

[14]

  1. Simplify the expression using Boolean algebra.
  2. State the principle of duality in Boolean algebra and give the dual of the Boolean expression.
  3. Discuss the memory hierarchy and explain how the performance of the memory system is improved by using cache.

[15]

  1. Differentiate between SOP and POS methods with their maxterms and minterms.
  2. Explain all logic gates with truth table and logic circuit design.
  3. Explain the basic read operation in cache memory organization.

[16]

  1. What is a flip-flop? Explain the working of RS flip-flop with a logic diagram.
  2. Design a BCD to Excess-3 code converter.
  3. Implement the given function using NAND gates.

[17]

  1. Implement EX-OR Gate using only NAND Gates.
  2. Express the given Boolean function in a sum of minterms.
  3. Design a counter with a repeated sequence of six states (0, 1, 2, 4, 5, 6) using JK Flip-Flops.

[18]

  1. How do you calculate energy stored by an inductor?
  2. State and prove Thevenin's theorem.
  3. The power factor of an RL circuit is 1/2. If the frequency of AC is doubled, what will be the power factor?

[19]

  1. Earth wire is connected to the ground.
  2. An impedance relay is used for earth faults and interphase faults.
  3. The superposition theorem is applicable to current and voltage both.

[20]

  1. What is the hold condition of a flip-flop?
  2. Which logic family has the minimum power dissipation?
  3. How many NAND gates are required to implement a full adder?

[21]

  1. In CMOS logic circuits, the n-MOS transistor acts as a pull-down network.
  2. The magnitude of the current source in the AC equivalent circuit of an FET depends on external drain resistance.
  3. Negative feedback in an amplifier stabilizes the gain.

[22]

  1. Difference between Registers and Counters.
  2. State and verify De Morgan's Law in Boolean Algebra.
  3. Define Multiplexer (81) MUX Design.

[23]

  1. Design and draw the logic diagram of a full adder.
  2. What is race-around condition? Construct a master-slave flip-flop using an SR flip-flop.
  3. Explain how the 3-to-8 decoder function can be obtained from a demultiplexer.

[24]

  1. Simplify the given function using k-maps: F(A, B, C, D) = >(0, 2, 3, 5, 7, 9, 11, 13, 14).
  2. Draw RS flip-flop and explain its working.
  3. Design 5-Mod counters using J-K flip-flop.

[25]

  1. Write short notes on Virtual memory organization and Random access memories.
  2. Design the binary counters having the repeated binary sequence: (i) 0, 1, 2 (ii) 0, 1, 2, 3, 4 using JK flip-flops.
  3. State De-Morgan's theorems of Boolean Algebra and prove them. What is the physical significance of these theorems?

[26]

  1. Differentiate between flip flop and latches.
  2. Draw a full subtractor circuit using NAND gate.
  3. Differentiate between L1 cache & L2 cache.

[27]

  1. With a logic diagram, characteristic table, and characteristic equation, explain the operation of a D Flip-Flop.
  2. Formulate all pertinent information required to construct a two-way set associative cache memory and determine its size.
  3. Design a 328 RAM chip using 164 memory chips.

[28]

  1. Drive the output equation for Non-inverting summing amplifier.
  2. Explain the Common Drain (CD) JFET Amplifier.
  3. Write short notes on any three of the following: Bridge rectifier circuit, SVRR and CMRR, Intrinsic semiconductor, Emitter biasing.

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