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Important Questions for "Electronics":

[1]

  1. What is phase reversal in electronics?
  2. What determines diode behavior in circuits with varying potentials?
  3. How is critical wavelength calculated for photo conductors?

[2]

  1. Describe the mode of working of an edge triggered S-R Flip Flop.
  2. Using the postulates of Boolean Algebra, simplify the given expressions.
  3. Distinguish between Combinational and Sequential Circuits, Synchronous and Asynchronous Counter, and T flip flop and D flip flop. Provide suitable diagrams where necessary.

[3]

  1. Show that NAND gate is a universal gate.
  2. Using the postulates of Boolean Algebra, simplify the given expressions.
  3. What is a Shift Register? Discuss the different modes of operation of Shift Register with clear diagram. Mention the use of Shift Register in computer hardware circuits.

[4]

  1. Differentiate between: (i) Combinational and Sequential circuits, (ii) Decoder and Encoder.
  2. Describe the working of a Master-Slave J-K Flip-Flop with the help of a clear block diagram and state table. Explain the 'Race-Around Condition' and discuss how the Master-Slave setup circumvents it.
  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. With suitable diagrams, explain JK and RS flip-flops.
  2. Differentiate between asynchronous and synchronous circuits. What are the problems related to asynchronous circuits?
  3. What is meant by the race around condition? How can it be solved? Explain.

[6]

  1. State and explain De Morgan's Theorem.
  2. What is 'Race around' condition? Draw the schematic diagram of J-K Master Slave Flip Flop and explain its working as a solution to Race-Around condition.
  3. Write short notes on Associative Memory and Cache Memory.

[7]

  1. What is the role of a Memory Management Unit (MMU) in address translation?
  2. What happens to the state of the interrupted process when a page fault occurs?
  3. What is DeMorgan's Law, and how does it apply to Boolean algebra?

[8]

  1. Why does RC coupling give constant gain over the mid-frequency range?
  2. Define current gain parameters for common base and common emitter configurations in a transistor. Establish a relation between them.
  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. Discuss Nyquist rate energy expression in band-limited signals.
  2. Discuss modulation types used for sound carrier in television transmission.
  3. Describe float and integer interactions in arithmetic operations.

[10]

  1. Derive the Barkhausen criterion for sustained oscillations.
  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. Find out the expression for input impedance, output impedance, current gain, voltage gain and power gain in terms of h-parameters for CE amplifier.

[11]

  1. Discuss the Fermi level in intrinsic and extrinsic semiconductors.
  2. Explain DC and AC load lines for transistor.
  3. Find out the expression for input impedance, output impedance, current gain, voltage gain and power gain in terms of h-parameters for CE amplifier.

[12]

  1. Derive the Barkhausen criterion for sustained oscillations.
  2. What is Boolean Algebra? Write down its commutative, associative and distributive properties.
  3. Draw the circuit of R-C coupled CE amplifier and explain its frequency response curve at different frequency ranges. Why does the gain decrease in low and high frequency ranges?

[13]

  1. Draw the logic diagram for BCD to Excess-3 code converter. Include truth table and K-map steps.
  2. Draw the block diagram of a 4-bit register with parallel load.
  3. Draw the block diagram of a 4-bit full adder circuit.

[14]

  1. State the principle of duality in Boolean algebra and give the dual of the Boolean expression.
  2. Discuss the memory hierarchy and explain how the performance of the memory system is improved by using cache.
  3. Express the given Boolean functions as a sum of minterms and as a product of maxterms.

[15]

  1. Explain half adder with truth table and logic circuit diagram.
  2. Explain full-adder with truth table and construct its logic diagram using half-adder.
  3. Write short notes on shift register, D flip-flop, divide-by-N ripple counter, PROM, and EPROM.

[16]

  1. State and prove De-Morgan's theorem and simplify the given expression.
  2. Differentiate between combinational and sequential circuits.
  3. Explain the working of RS and D flip-flops.

[17]

  1. Simplify the given K-map expression.
  2. Write a short note on a 4-bit register with parallel load.
  3. Implement a Full Adder circuit using a decoder and two OR gates.

[18]

  1. Explain working of High pass filter.
  2. Find out the current flowing through 40 resistance in the given circuit.
  3. What is the value of R required for maximum power transfer in the given circuit?

[19]

  1. The ratio between differential gain and common-mode gain is called common mode rejection.
  2. The use of negative feedback makes linear operation possible.
  3. Which principle does a Zener diode work on?

[20]

  1. Which combinational circuit is used for sending data from a single source to multiple destinations?
  2. For which combination of inputs does the output of the given circuit become 1?
  3. How many NAND gates are required to implement a full adder?

[21]

  1. Two similar 15V zener diodes connected in series will give a regulated output voltage of 30V.
  2. The unit of h-parameter is mho.
  3. Which biasing method is independent of transistor beta?

[22]

  1. How many address lines does the 2732 EPROM have?
  2. State and verify De Morgan's Law in Boolean Algebra.
  3. Write short notes on cache memory organization.

[23]

  1. What is Read-Only Memory? How do PROM, EPROM, and EEPROM differ from each other?
  2. What is a flip-flop? Explain the T flip-flop.
  3. Using eight 648 ROM chips with an enable input and decoder, construct a 5128 ROM.

[24]

  1. Draw RS flip-flop and explain its working.
  2. Design 5-Mod counters using J-K flip-flop.
  3. What is cache memory? Why is it called high-speed memory?

[25]

  1. Make the truth tables of half adder and half subtractor.
  2. Prove that (A+B +AB) (A+B) (AB)=0.
  3. State De-Morgan's theorems of Boolean Algebra and prove them. What is the physical significance of these theorems?

[26]

  1. Draw the memory hierarchy structure and mark the arrow from low to high (Speed) & high to low (Cost).
  2. Draw and explain 4-bit binary synchronous counter.
  3. Explain the concept of Virtual memory.

[27]

  1. Why is RAM used in computers? How is static RAM different from dynamic RAM and where are these RAMs used in computer systems?
  2. Design a synchronous sequential circuit with two inputs T and C. The output becomes 1 when T = 1 and C transitions from 1 to 0. Otherwise, the output is 0.
  3. Design a 328 RAM chip using 164 memory chips.

[28]

  1. Drive the output equation for Non-inverting summing amplifier.
  2. Draw the circuit diagram of a Half-wave rectifier and calculate: Idc, Irms, Ripple factor, Efficiency of rectification, PIV rating of diode.
  3. Explain the Common Drain (CD) JFET Amplifier.

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