# Subtractors and Arithmetic Logic Units (ALU) MCQ

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

A) Adds two binary numbers

B) Multiplies two binary numbers

C) Divides two binary numbers

D) Subtracts one binary number from another

Answer: D

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

Answer: A

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

A) Addition

B) Subtraction

C) Logic operations (AND, OR, XOR)

D) All of the above

Answer: D

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

Answer: A

Which gate is commonly used internally in a subtractor?

A) XOR gate

B) AND gate

C) OR gate

D) NAND gate

Answer: A

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

Answer: B

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

Answer: A

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.

Answer: B

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.

Answer: C

Which gate is commonly used internally in a half subtractor?

A) XOR gate

B) AND gate

C) OR gate

D) NAND gate

Answer: A

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

Answer: A

## MCQs of Digital Logic Design (DLD)

**Introduction to Digital Systems**

- Analog vs. Digital signals MCQs
- Binary numbers and arithmetic MCQs
- Logic levels and noise margins MCQs

**Boolean Algebra**

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

**Combinational Logic**

**Logic Gates**

**Combinational Circuits**

- Design and analysis of combinational circuits MCQ
- Multiplexers and Demultiplexers MCQ
- Encoders and Decoders MCQ
- Binary Adders (Half adder, Full adder) MCQ
- Subtractors and Arithmetic Logic Units (ALU) MCQ
- Comparators MCQ in DLD

**Sequential Logic**

**Flip-Flops and Latches**

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

**Counters and Registers**

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

**State Machines**

**Finite State Machines (FSMs)**

**Memory and Programmable Logic MCQs**

**Memory Devices**

- Read-Only Memory (ROM)
- Random Access Memory (RAM)
- Programmable Logic Devices (PLDs) MCQs
- 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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