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Important Questions for "Electronics":

[1]

  1. What is phase reversal in electronics?
  2. How is a Zener diode typically used?
  3. What does Wiedmann-Franz law state?

[2]

  1. What is the basic function of a decoder? Explain basic 3-input decoder with diagram.
  2. What do you understand by Virtual Memory? Explain the basic organization and working methodology of Virtual Memory.
  3. Using the Karnaugh Map method, minimize the given expression.

[3]

  1. Describe the mode of working of an edge triggered S-R Flip Flop.
  2. What are 'don't care' conditions? Discuss how they are handled, with the help of an example.
  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. Write explanatory notes on: (i) EPROM, (ii) CD-ROM, (iii) Decade Counter.
  2. Write short notes on: (i) RAM Banking, (ii) Associative Memory.
  3. Define and explain with examples: (i) Don't care condition, (ii) Associative and Distributive Laws of Boolean Algebra, (iii) Min Term and Max Term.

[5]

  1. Explain the following terms: De Morgan's Law, ROM and RAM, Counters.
  2. Differentiate between asynchronous and synchronous circuits. What are the problems related to asynchronous circuits?
  3. Differentiate between floppy disk and hard disk.

[6]

  1. Define Minterm, Maxterm, POS Expression, SOP Expression, and Combinational Logic with respect to Boolean Algebra.
  2. Draw the truth table for the expression y = BC + ABC and construct the POS expression for y.
  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. Which method of combination circuit implementation is widely adopted with maximum output functions and minimum requirement of ICs?
  2. When does a page fault occur?
  3. What is the concept in which a process is copied into the main memory from secondary memory according to the requirement?

[8]

  1. Define and explain Fermi level.
  2. Write notes on Zener breakdown and avalanche diodes.
  3. Why is biasing necessary for a transistor? Describe various methods of transistor biasing. Which method is best and why?

[9]

  1. For infinite transmission line, derive voltage and current equations.
  2. Discuss input impedance of short-circuited transmission line.
  3. Explain radar pulse repetition frequency and its role in determining range zones.

[10]

  1. Explain the depletion layer in p-n junction diode with suitable diagram.
  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. What are Power Amplifiers? Write down the difference between Voltage and Power Amplifiers. Explain the working of class A power amplifier with suitable circuit diagram and output characteristic curve.

[11]

  1. Discuss the Fermi level in intrinsic and extrinsic semiconductors.
  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. What is MOSFET? Explain the construction and working of depletion type and enhancement type of MOSFET with their respective characteristic curves.

[12]

  1. Write a short note on emitter follower circuit.
  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. Find out the expression for input impedance, output impedance, current gain, voltage gain and power gain in terms of h-parameters for CE amplifier.

[13]

  1. Explain how 73x (base-x) equals 54y (base-y). Provide possible values for x and y.
  2. What is Cache memory? Why is it needed?
  3. Discuss Half subtractor and define Boolean functions for outputs.

[14]

  1. State the principle of duality in Boolean algebra and give the dual of the Boolean expression.
  2. What is Multiplexer? Construct a 16x1 line multiplexer using two 8x1 and one 2x1 line multiplexer.
  3. Design a Mod 7 binary counter and draw its state diagram and circuit.

[15]

  1. Differentiate between combinational and sequential circuits.
  2. Simplify the given expression using K-map.
  3. Realize the given Boolean expression using 4x1 multiplexer.

[16]

  1. State and prove De-Morgan's theorem and simplify the given expression.
  2. Implement an EX-OR gate using NOR gates.
  3. Design a logic construction of a 32 x 4 ROM and determine the size of the decoder used.

[17]

  1. Explain the working of JK Flip-Flop with a logic diagram and excitation table.
  2. Determine the number of 128 x 8 RAM chips required to provide a memory capacity of 2048 bytes.
  3. Write short notes on the block diagrams of RAM and ROM, cache memory, virtual memory, and the difference between static RAM and dynamic RAM.

[18]

  1. Discuss charging and discharging phenomenon in RC circuit with example.
  2. What is the value of R required for maximum power transfer in the given circuit?
  3. How can you convert Delta network into Star network? Explain with example.

[19]

  1. Earth wire is connected to the ground.
  2. The value of one decibel is equal to 10 log(N).
  3. An example of a magnetic dipole is a current loop.

[20]

  1. Convert (1101100111.00111) into octal equivalent.
  2. How many bits are in an ASCII character?
  3. How many comparators are required in a 4-bit flash type ADC?

[21]

  1. The unit of h-parameter is mho.
  2. A one-section filter consists of capacitor and inductor.
  3. An n-channel D-MOSFET with positive V_GS operates in enhancement mode.

[22]

  1. What is truth table? What is its significance?
  2. Explain the Edge Triggered D Flip-Flops.
  3. Explain the operation of the bi-directional shift register.

[23]

  1. What is a flip-flop? Explain the T flip-flop.
  2. What is race-around condition? Construct a master-slave flip-flop using an SR flip-flop.
  3. Discuss various semiconductor cells and RAM organization. If 16K8 memory chips are used to construct a 64K16 memory, determine the number of chips needed and draw a block diagram showing the connections of chips to address lines.

[24]

  1. Give the applications of shift registers.
  2. State the boolean distributive law.
  3. Simplify the given function using k-maps: F(A, B, C, D) = >(0, 2, 3, 5, 7, 9, 11, 13, 14).

[25]

  1. Explain the working of half-adder with suitable block diagram.
  2. What do you know about K-map?
  3. Simplify the expression using Karnaugh map method: B-+AB+BC+ABC+ABC +BC.

[26]

  1. Draw & explain bidirectional shift register.
  2. Draw and explain 4-bit binary synchronous counter.
  3. Differentiate between EPROM & EEPROM.

[27]

  1. Give the logic diagram and truth table of RS flip-flop.
  2. Why is RAM used in computers? How is static RAM different from dynamic RAM and where are these RAMs used in computer systems?
  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. Drive the output equation for Non-inverting summing amplifier.
  2. 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.
  3. Drive an expression for Adder-Subtractor circuit using OP-AMP.

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