FAQs on CPU Structure & Function

Question 1

1. What is the structure of a CPU?

Accepted Answer

Ans. The structure of a CPU (Central Processing Unit) consists of three main components: the control unit, the arithmetic logic unit (ALU), and the registers. The control unit manages the execution of instructions, the ALU performs mathematical and logical operations, and the registers store data and instructions temporarily.

Question 2

2. How does the control unit function in a CPU?

Accepted Answer

Ans. The control unit in a CPU is responsible for fetching, decoding, and executing instructions. It coordinates the flow of data between the CPU and other devices, controls the timing and synchronization of operations, and manages the execution of instructions by sending control signals to different parts of the CPU.

Question 3

3. What is the function of the arithmetic logic unit (ALU) in a CPU?

Accepted Answer

Ans. The arithmetic logic unit (ALU) is the part of a CPU that performs mathematical and logical operations. It can perform arithmetic operations like addition, subtraction, multiplication, and division, as well as logical operations like AND, OR, and NOT. The ALU operates on binary data and produces results based on the instructions given by the control unit.

Question 4

4. What role do registers play in a CPU?

Accepted Answer

Ans. Registers are small, high-speed memory units located within a CPU. They are used to store data and instructions temporarily during the execution of a program. Registers provide fast access to data and improve the overall performance of the CPU by reducing the need to access main memory frequently.

Question 5

5. How does the CPU execute instructions?

Accepted Answer

Ans. The CPU executes instructions in a cycle known as the fetch-decode-execute cycle. In the fetch stage, the control unit fetches the next instruction from memory. In the decode stage, the control unit decodes the instruction to determine the operation to be performed. In the execute stage, the ALU performs the necessary calculations or operations based on the decoded instruction. This cycle repeats until all instructions in a program are executed.

CPU Structure & Function Video Lecture - Computer Architecture & Organisation

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