Encoders and Decoders MCQ

By: Prof. Dr. Fazal Rehman Shamil | Last updated: June 8, 2024

What is the primary function of an encoder in digital circuits?

A) Combine multiple signals into one
B) Split a signal into multiple outputs
C) Perform arithmetic operations
D) Convert multiple inputs into a coded output
Answer: D
What is the primary function of a decoder in digital circuits?

A) Combine multiple signals into one
B) Split a signal into multiple outputs
C) Perform arithmetic operations
D) Convert a coded input into multiple outputs
Answer: D
Which of the following is NOT a characteristic of encoders?

A) They have multiple inputs and one output.
B) They perform a binary-to-decimal conversion.
C) They convert parallel data to serial data.
D) They reduce the number of bits in a data stream.
Answer: B
Which of the following is NOT a characteristic of decoders?

A) They have one input and multiple outputs.
B) They perform a decimal-to-binary conversion.
C) They convert serial data to parallel data.
D) They increase the number of bits in a data stream.
Answer: D

Which gate is commonly used internally in encoders?

A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
Answer: B
Which gate is commonly used internally in decoders?

A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
Answer: B
What is the minimum number of input lines required for a 4-to-2 encoder?

A) 1
B) 2
C) 3
D) 4
Answer: C
What is the minimum number of output lines required for a 2-to-4 decoder?

A) 1
B) 2
C) 3
D) 4
Answer: C

Which of the following is a characteristic of priority encoders?

A) They encode multiple inputs into a binary output based on priority.
B) They perform parallel-to-serial conversion.
C) They convert serial data to parallel data.
D) They increase the number of bits in a data stream.
Answer: A
Which of the following is a characteristic of binary decoders?

A) They encode multiple inputs into a binary output.
B) They perform parallel-to-serial conversion.
C) They convert serial data to parallel data.
D) They increase the number of bits in a data stream.
Answer: A
In a 3-to-8 decoder, how many select lines are there?

A) 1
B) 2
C) 3
D) 8
Answer: C
In a priority encoder with 4 input lines, what is the maximum number of encoded outputs?

A) 2
B) 3
C) 4
D) 5
Answer: B
Which gate is used for selecting the input lines in an encoder?

A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
Answer: B
Which gate is used for selecting the output lines in a decoder?

A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
Answer: B
What is the output of a 2-to-4 encoder if both input lines are LOW (0)?

A) Output 0
B) Output 1
C) Output 2
D) Output 3
Answer: A

MCQs of Digital Logic Design (DLD)

Introduction to Digital Systems

1. Analog vs. Digital signals MCQs
2. Binary numbers and arithmetic MCQs
3. Logic levels and noise margins MCQs

Boolean Algebra

1. Basic logic operations (AND, OR, NOT) MCQ
2. Laws and theorems of Boolean algebra MCQ
3. De Morgan’s Theorems MCQ
4. Canonical forms (Sum of Products, Product of Sums) MCQ
5. Simplification techniques (Karnaugh Maps, Quine-McCluskey method) MCQ

Combinational Logic

Logic Gates

1. Basic gates (AND, OR, NOT) Gat MCQ
2. Universal gates (NAND, NOR) Gat MCQs
3. XOR and XNOR gates MCQ

Combinational Circuits

1. Design and analysis of combinational circuits MCQ
2. Multiplexers and Demultiplexers MCQ
3. Encoders and Decoders MCQ
4. Binary Adders (Half adder, Full adder) MCQ
5. Subtractors and Arithmetic Logic Units (ALU) MCQ
6. Comparators MCQ in DLD

Sequential Logic

Flip-Flops and Latches

1. SR Latch, D Latch MCQ
2. Flip-Flops (SR, D, JK, T) MCQ
3. Characteristic equations and excitation tables MCQ
4. Edge-triggered vs. level-triggered devices MCQ

Counters and Registers

1. Synchronous, Asynchronous (ripple), Up/Down counters MCQs
2. Shift registers (SIPO, PISO, SISO, PIPO) MCQs

State Machines

Finite State Machines (FSMs)

1. Moore and Mealy machines MCQs

Memory and Programmable Logic MCQs

Memory Devices

1. Read-Only Memory (ROM)
2. Random Access Memory (RAM)
3. Programmable Logic Devices (PLDs) MCQs
4. Field Programmable Gate Arrays (FPGAs) MCQs

More MCQs of Digital Logic Design (DLD)

• • SET 1: DLD MCQs with answers (dld mcqs with answers)
  • SET 2: DLD MCQs (dld basic mcqs)
  • SET 3: DLD MCQs (solved mcqs of dld)
  • SET 4: DLD MCQs (dld repeated mcqs)
  • SET 5: DLD MCQs (dld important mcqs)
  • SET 6:DLD MCQs DLD Solved MCQs Answers PDF

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