Subtractors and Arithmetic Logic Units (ALU) MCQ

By: Prof. Dr. Fazal Rehman | Last updated: June 20, 2025

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1. : What is the primary function of a subtractor in digital circuits?





2. : What is the main purpose of an Arithmetic Logic Unit (ALU) in digital systems?





3. : Which of the following operations can be performed by an ALU?





4. : What is the output of a subtractor if the minuend is 1101 and the subtrahend is 0110?





5. : Which gate is commonly used internally in a subtractor?





6. : What is the primary function of a half subtractor in digital circuits?





7. : What is the primary function of a full subtractor in digital circuits?





8. : Which of the following statements about half subtractors is true?





9. : Which of the following statements about full subtractors is true?





10. : Which gate is commonly used internally in a half subtractor?





11. : Which gates are commonly used internally in a full subtractor?





 

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)

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