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Important Questions for "Electronics":

[1]

  1. What is phase reversal in electronics?
  2. How is current gain calculated in common base transistor circuits?
  3. What does 'P' denote in n-p-n transistors?

[2]

  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. What are 'don't care' conditions? Discuss how they are handled, with the help of an example.

[3]

  1. Show that NAND gate is a universal gate.
  2. Using the Karnaugh Map method, minimize the given expression.
  3. What are 'don't care' conditions? Discuss how they are handled, with the help of an example.

[4]

  1. Explain the working of a decoder or a multiplexer.
  2. Differentiate between: (i) Combinational and Sequential circuits, (ii) Decoder and Encoder.
  3. Write explanatory notes on: (i) EPROM, (ii) CD-ROM, (iii) Decade Counter.

[5]

  1. Differentiate between floppy disk and hard disk.
  2. Differentiate between Multiplexer and Decoder.
  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. Draw the Block diagram for a 3-Bit Binary Counter and explain its working with timing diagram.

[7]

  1. What is the concept in which a process is copied into the main memory from secondary memory according to the requirement?
  2. Why are segment replacement algorithms more complex than page replacement algorithms?
  3. What is DeMorgan's Law, and how does it apply to Boolean algebra?

[8]

  1. What is a tunnel diode? Draw its characteristic curve and explain its working with the help of an energy band diagram. Mention the application of tunnel diode.
  2. Why is biasing necessary for a transistor? Describe various methods of transistor biasing. Which method is best and why?
  3. Explain the construction and working principle of a Unijunction Transistor (UJT) with its V-I characteristic curve.

[9]

  1. Explain radar pulse repetition frequency and its role in determining range zones.
  2. Discuss modulation types used for sound carrier in television transmission.
  3. List primary colors used in color television.

[10]

  1. Write a short note on emitter follower circuit.
  2. What is Boolean Algebra? Write down its commutative, associative and distributive properties.
  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. Convert octal number (24) to binary equivalent.
  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.

[12]

  1. What is Field Effect Transistor (FET)? Why is it called unipolar transistor?
  2. What is Boolean Algebra? Write down its commutative, associative and distributive properties.
  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. Find the AND, OR, NOT, EX-OR, and EX-NOR operations for two digital signals.
  2. Express Boolean function F = AB + A'D as product of maxterms.
  3. Simplify Boolean functions through equations and K-map.

[14]

  1. Construct a D flip-flop using SR flip-flop and JK flip-flop.
  2. Design basic gates using NOR gate.
  3. Write short notes on Shift Registers, PROM and EPROM, Combination and Sequential circuits, and Don't care condition.

[15]

  1. Explain half adder with truth table and logic circuit diagram.
  2. Convert RS flip-flop to T flip-flop using excitation table.
  3. Explain modulus counter and design a 3-bit asynchronous counter using JK flip-flop.

[16]

  1. State and prove De-Morgan's theorem and simplify the given expression.
  2. Find the base (or radix) of the number system for the given equation.
  3. Differentiate between combinational and sequential circuits.

[17]

  1. Explain the working of JK Flip-Flop with a logic diagram and excitation table.
  2. What is a decoder? Design a BCD to decimal decoder.
  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. Discuss charging and discharging phenomenon in RC circuit with example.
  3. How can you convert Delta network into Star network? Explain with example.

[19]

  1. The magnetic flux in a transformer should have low reluctance.
  2. The rate of change of current decay in an L-R circuit depends on the time constant.
  3. What is the unit of magnetic flux?

[20]

  1. How many comparators are required in a 4-bit flash type ADC?
  2. How is a J-K flip-flop made to toggle?
  3. Which of the following is not a basic logic gate?

[21]

  1. What is the operating voltage range of CMOS?
  2. A self-bias arrangement improves Q-point stability when both B and R_2 are large.
  3. Three cascaded amplifier stages, each with a gain of 50, result in an overall gain of 125000.

[22]

  1. Explain the Edge Triggered D Flip-Flops.
  2. How many address lines does the 2732 EPROM have?
  3. Explain the difference between cache memory and virtual memory.

[23]

  1. What is Read-Only Memory? How do PROM, EPROM, and EEPROM differ from each other?
  2. What is race-around condition? Construct a master-slave flip-flop using an SR flip-flop.
  3. Simplify the given Boolean functions using appropriate methods.

[24]

  1. Give the truth table and symbol for X-OR logic gate.
  2. Draw RS flip-flop and explain its working.
  3. Give the difference between Registers and Counters.

[25]

  1. Prove that NOR and NAND gates are Universal gates.
  2. What do you mean by cache memory? How is the performance of a memory system improved by using cache?
  3. Implement a full adder with the help of two half adders and an OR gate.

[26]

  1. Construct half subtractor using logic gates.
  2. What do you mean by shift register? What is the need of shift register?
  3. Draw basic cell of memory.

[27]

  1. Give the logic diagram and truth table of RS flip-flop.
  2. What is a decoder? Draw the circuit of a 2-to-4 decoder and explain its functions.
  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. A transistor has an Ic of 100 mA and IB of 0.5 mA. What is the value of adc?
  2. Describe the Ebers-Moll model of a bipolar junction transistor and explain the working of the transistor.
  3. Drive an expression for Adder-Subtractor circuit using OP-AMP.

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