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Our MCQs cover everything from the basics of logic gates and circuit design to advanced topics like memory organization, sequential building blocks, and CPU architecture. Each question is crafted to test your understanding and prepare you for any academic or professional challenge.
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This collection is tailored for anyone studying digital electronics and computer organization, making it an excellent resource for students, engineers, and tech enthusiasts alike. The questions align with standard curricula and industry practices, so you’re always on the right path.
Syllabus Overview
Unit I: Logic Gates and Circuit Design
- Introduction to Logic Gates: OR, AND, NOR, NAND, XOR, XNOR
- De Morgan’s Laws and Boolean Algebra
- Circuit Design Techniques: Sum of Products (SOP), Product of Sums (POS)
- Karnaugh Maps (K-Map) for simplification
- Binary Number Systems: Binary, Octal, Decimal, and Hexadecimal conversions
- Logic Levels and Voltage Standards: TTL, CMOS
- Truth Tables and Timing Diagrams
- Power Dissipation and Fanout
Unit II: Combinational Building Blocks
- Multiplexers: Understanding selection and data routing
- Decoders and Encoders: Conversion of information and data representation
- Adders and Subtractors: Half Adder and Full Adder
- Binary Subtractor design
- Arithmetic Circuits: Binary Multiplier and Divider
- Comparator Circuits: Magnitude Comparators
- Parity Generators and Checkers: Error detection techniques
Unit III: Memories
- Types of Memory: ROM, PROM, EPROM, RAM
- Flash Memory
- Cache Memory (L1, L2, L3)
- Virtual Memory Concepts: Paging and Segmentation
- Memory Hierarchy
- Storage Devices: Hard Disk, Floppy Disk, CD-ROM
- RAID Levels
- SSD vs HDD
- Secondary Storage Management
Unit IV: Sequential Building Blocks
- Flip-Flops: RS, D, JK, Master-Slave, T Flip-Flops
- Registers and Shift Registers
- Counters: Synchronous and Asynchronous Counters
- Counter Designing Methods
- Finite State Machines (FSM): Mealy and Moore Machines
- Latches
- Programmable Logic Devices (PLDs): PAL, PLA, FPGA
- Pulse-Triggered Devices: Edge-triggered vs level-triggered circuits
Unit V: Memory Organization
- Memory Cells: SRAM, DRAM
- Memory Interfacing: Address and Data Bus Connections
- Cache Memory Organization: Write-back vs Write-through policies
- Cache Mapping Techniques: Direct, Associative, Set-Associative
- Memory Protection and Addressing Modes
- Memory Management in Operating Systems: Swapping, Paging, Segmentation
Unit VI: CPU and Processor Organization
- Processor Design: Control Unit, ALU
- Instruction Cycle, Execution, Pipelining
- Microprogramming: Microprogrammed control vs Hardwired control
- RISC vs CISC Architectures
- Data Path and Control Path in Processors
Question: 1
Which of the following logic gates is known as the 'universal gate' because it can be used to create any other type of gate?
- AND
- OR
- NAND
- XOR
Click to see the answer
Correct Answer: C. NAND
Explanation: The NAND gate is considered a universal gate because any other logic gate can be implemented using only NAND gates.
Question: 2
What is the output of an XOR gate when both of its inputs are the same?
- 1
- 0
- Undefined
- Depends on the inputs
Click to see the answer
Correct Answer: B. 0
Explanation: An XOR gate outputs 1 only when its inputs are different. If both inputs are the same, the output is 0.
Question: 3
Which logic gate produces a high output (1) only when all its inputs are low (0)?
- NOR
- NAND
- AND
- OR
Click to see the answer
Correct Answer: A. NOR
Explanation: The NOR gate outputs 1 only when all its inputs are 0. If any input is 1, the output is 0.
Question: 4
Which of the following Boolean expressions represents a NOR gate?
- A + B
- A + B'
- (A + B)'
- AB
Click to see the answer
Correct Answer: C. (A + B)'
Explanation: The expression (A + B)' represents a NOR gate, which is the negation of the OR gate.
Question: 5
How does a NAND gate function when both inputs are 1?
- Outputs 0
- Outputs 1
- Outputs the same as the inputs
- Outputs undefined value
Click to see the answer
Correct Answer: A. Outputs 0
Explanation: A NAND gate outputs 0 only when both inputs are 1. Otherwise, it outputs 1.
Question: 6
Which of the following logic gates will have an output of 1 if at least one of its inputs is 1?
- AND
- OR
- XOR
- NOR
Click to see the answer
Correct Answer: B. OR
Explanation: The OR gate outputs 1 when any one of its inputs is 1. It outputs 0 only when all inputs are 0.
Question: 7
Which gate is the opposite of the XOR gate?
- NOR
- B. XNOR
- AND
- NAND
Click to see the answer
Correct Answer: XNOR
Explanation: The XNOR gate is the opposite of the XOR gate. It outputs 1 when both inputs are the same and 0 when they are different.
Question: 8
What is the output of a 2-input AND gate when one input is 1 and the other is 0?
- 1
- 0
- Undefined
- Depends on the other input
Click to see the answer
Correct Answer: B. 0
Explanation: An AND gate outputs 1 only when all its inputs are 1. If any input is 0, the output is 0.
Question: 9
Which of the following represents the Boolean expression for an AND gate?
- A + B
- AB
- A' + B'
- A + B'
Click to see the answer
Correct Answer: B. AB
Explanation: The Boolean expression for an AND gate is AB, which means the output is 1 only if both A and B are 1.
Question: 10
Which logic gate inverts its input?
- OR
- NAND
- NOT
- AND
Click to see the answer
Correct Answer: C. NOT
Explanation: The NOT gate, also known as an inverter, inverts the input. If the input is 1, the output is 0, and vice versa.