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Which combination of the following options accurately describes a computer's essential components of the Central Processing Unit (CPU)?

1. An Arithmetic and Logic Unit (ALU)
2. A control unit
3. A number of registers

  • A

    2 and 3

  • B

    1 and 2

  • C

    1, 2 and 3

  • D

    1 and 3

There are many computers in modern aircraft, and they all work in much the same way, although they won’t all have a keyboard and screen.

Essentially, in the Von Neumann architecture, the Central Processor (CPU), which is the brain and does all the work, is connected to memory (as a single storage structure that can hold instructions and data) and other peripheral chips (that may control input and output devices such as screens, printers, keyboards, etc.) over various buses that control memory or data.

It consists of:

  • an Arithmetic and Logic Unit(ALU);
  • a control and timing unit - sequences and coordinates operations; and
  • registers.

In its operation, the CPU can use the address bus, data bus and control bus.

Multiprocessing involves several CPUs inside one computer. In fact, modern technology allows several CPUs inside one chip (multithreading), which only works if the software is aware of the facility.

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