# Subtractors and Arithmetic Logic Units (ALU) MCQ

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

B) Multiplies two binary numbers
C) Divides two binary numbers
D) Subtracts one binary number from another
What is the main purpose of an Arithmetic Logic Unit (ALU) in digital systems?

A) To perform arithmetic and logic operations
B) To store data temporarily
C) To generate clock signals
D) To convert analog signals to digital
Which of the following operations can be performed by an ALU?

B) Subtraction
C) Logic operations (AND, OR, XOR)
D) All of the above
What is the output of a subtractor if the minuend is 1101 and the subtrahend is 0110?

A) Difference = 1011
B) Difference = 0011
C) Difference = 1001
D) Difference = 0101
Which gate is commonly used internally in a subtractor?

A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
What is the primary function of a half subtractor in digital circuits?

A) Subtracts two binary numbers with borrow
B) Subtracts two binary numbers without borrow
C) Subtracts three binary numbers with borrow
D) Subtracts three binary numbers without borrow
What is the primary function of a full subtractor in digital circuits?

A) Subtracts two binary numbers with borrow
B) Subtracts two binary numbers without borrow
C) Subtracts three binary numbers with borrow
D) Subtracts three binary numbers without borrow
Which of the following statements about half subtractors is true?

A) They have two inputs and two outputs.
B) They have two inputs and one output.
C) They have three inputs and two outputs.
D) They have three inputs and one output.
Which of the following statements about full subtractors is true?

A) They have two inputs and two outputs.
B) They have two inputs and one output.
C) They have three inputs and two outputs.
D) They have three inputs and one output.
Which gate is commonly used internally in a half subtractor?

A) XOR gate
B) AND gate
C) OR gate
D) NAND gate
Which gates are commonly used internally in a full subtractor?

A) XOR gate and AND gate
B) XOR gate and OR gate
C) AND gate and OR gate
D) NAND gate and NOR gate

## MCQs of Digital Logic Design (DLD)

Introduction to Digital Systems

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

Combinational Circuits

Sequential Logic

Flip-Flops and Latches

Counters and Registers

State Machines

Finite State Machines (FSMs)

1. Moore and Mealy machines MCQs

Memory and Programmable Logic MCQs

Memory Devices

## More MCQs of Digital Logic Design (DLD)

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