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Important Questions for "Electronics":

[1]

  1. What is phase reversal in electronics?
  2. How many terminals does an SCR device have?
  3. What is the order of thickness for P-N junctions?

[2]

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

[4]

  1. Which gate is known as the 'Agreement Gate'? Why?
  2. Describe the working of a full adder with the help of a clear circuit diagram and truth table.
  3. Write explanatory notes on: (i) EPROM, (ii) CD-ROM, (iii) Decade Counter.

[5]

  1. What are the basic gates? How can other gates be constructed using the basic gates? Explain.
  2. Explain serial transfer with respect to a shift register with a suitable example.
  3. Differentiate between asynchronous and synchronous circuits. What are the problems related to asynchronous circuits?

[6]

  1. Explain 'don't care' state in K-Map with an example.
  2. Draw the schematic diagram of a Hard Disk Drive setup. Discuss its working and explain terms like Track, Sector, Cylindering of Information, Seek Time, Latency Time, and Disk Fragmentation.
  3. Write short notes on Associative Memory and Cache Memory.

[7]

  1. What is virtual memory, and what does it allow?
  2. What is DeMorgan's Law, and how does it apply to Boolean algebra?
  3. What is an essential prime implicant in Boolean expressions?

[8]

  1. Write notes on base-width modulation in a transistor.
  2. Explain the construction and working principle of a Unijunction Transistor (UJT) with its V-I characteristic curve.
  3. Write notes on distortion in amplifiers.

[9]

  1. The primary constant of a transmission line are R, L, G, C.
  2. For infinite transmission line, derive voltage and current equations.
  3. Explain propagation constant of a uniform transmission line per unit length.

[10]

  1. Discuss the Fermi level in intrinsic and extrinsic semiconductors.
  2. Convert octal number (24) to binary equivalent.
  3. 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.

[11]

  1. Explain DC and AC load lines for transistor.
  2. Calculate the barrier capacitance of p-n junction diode made of Germanium having area 1 um and thickness 100 nm. The dielectric constant of Germanium is 16.
  3. 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.

[12]

  1. Explain the depletion layer in p-n junction diode with suitable diagram.
  2. Convert octal number (24) to binary equivalent.
  3. What is MOSFET? Explain the construction and working of depletion type and enhancement type of MOSFET with their respective characteristic curves.

[13]

  1. Construct a 5 x 32 decoder using 3 x 8 decoders and 2 x 4 decoder.
  2. Draw the block diagram of a 4-bit register with parallel load.
  3. Design a counter with binary sequence using T flip-flops.

[14]

  1. Simplify the given Boolean function through K-Map.
  2. Define Full Adder and implement a full adder circuit using NAND gate.
  3. Discuss the memory hierarchy and explain how the performance of the memory system is improved by using cache.

[15]

  1. Realize the given Boolean expression using 4x1 multiplexer.
  2. Explain full-adder with truth table and construct its logic diagram using half-adder.
  3. Explain the basic read operation in cache memory organization.

[16]

  1. What is Cache memory? Design a 32 x 8 RAM structure.
  2. Represent a decimal number in BCD and Excess-3 code.
  3. Design a logic construction of a 32 x 4 ROM and determine the size of the decoder used.

[17]

  1. Determine the number of 128 x 8 RAM chips required to provide a memory capacity of 2048 bytes.
  2. Simplify the given expression for a function using Boolean algebra.
  3. What is a decoder? Design a BCD to decimal decoder.

[18]

  1. Find out the current flowing through 40 resistance in the given circuit.
  2. State and prove Norton's theorem. Write down its advantage in network analysis.
  3. What are z-parameters? Write down their significance and calculate z-parameters for a two-port network.

[19]

  1. Which filter exhibits the most rapid roll-off rate?
  2. If the ground is applied in the (+) terminal of an inverting op-amp, the negative (-) terminal behaves as virtual ground.
  3. The number of electrons in one coulomb is approximately 6.25 10.

[20]

  1. How many comparators are required in a 4-bit flash type ADC?
  2. How many NAND gates are required to implement a full adder?
  3. For an n-variable, how many K-map cells are required?

[21]

  1. The resistivity of pure germanium under standard conditions is about 60 ohm-cm.
  2. A Wien bridge oscillator uses both positive and negative feedback.
  3. What is the gate voltage in a JFET at which drain current becomes zero?

[22]

  1. What is truth table? What is its significance?
  2. Explain how a J-K flip-flop can be converted into a D flip-flop.
  3. Define Basic Cell of Static RAM.

[23]

  1. Design and draw the logic diagram of a full adder.
  2. Explain how the 3-to-8 decoder function can be obtained from a demultiplexer.
  3. Simplify the given Boolean functions using appropriate methods.

[24]

  1. Design 5-Mod counters using J-K flip-flop.
  2. What is cache memory? Why is it called high-speed memory?
  3. Discuss various types of Logic Gates and their applications.

[25]

  1. Make the truth tables of half adder and half subtractor.
  2. Prove that (A+B +AB) (A+B) (AB)=0.
  3. What do you mean by cache memory? How is the performance of a memory system improved by using cache?

[26]

  1. Differentiate between combinational logic circuit and sequential circuits.
  2. Draw the memory hierarchy structure and mark the arrow from low to high (Speed) & high to low (Cost).
  3. What do you mean by shift register? What is the need of shift register?

[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. What are a multiplexer and a demultiplexer? Provide the logical expression.
  3. Explain the differences between volatile and non-volatile memory, static and dynamic memory, sequential and random access memory, magnetic and semiconductor memory, and SOP and POS.

[28]

  1. What is the Ripple factor of Rectifier? Find the Ripple factor of half-wave rectifier.
  2. Find the concentration of holes and electrons in an N-type silicon at 300 K if the conductivity is 0.1 (ohm-cm)-1. Given that n; at 300 K for silicon = 1.5 x 101cm3, Le at 300 K for silicon = 1300 cm2/V-S.
  3. What do you understand by Thermal Run-away? In what situations it can occur? Derive an expression for stability factor for a fixed bias circuit.

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