Computer Systems

Question 1

What is the range of numbers represented in an 8 bit number

Answer 1

00000000 to 11111111 (0 to 255)

256 values

Question 3

In two’s complement, which bit is negative, with all others being positive

Answer 3

The most significant bit (largest column)

Example: 128 (8 bits)

Question 4

What is the range of numbers an 8 bit two’s complement can represent

Answer 4

1000 0000 to 0111 1111

-128 to 127

Question 5

How does increase of bus width improve performance?

Answer 5

Reduces number of fetches to memory

• fewer fetches to transfer data if data bus is larger
• transfers more bits in one cycle

Question 6

What is the purpose of a digital signature?

Answer 6

Authenticates the sender of the document and makes sure the document has not been changed in transit.

Question 7

what is an intelligent car system and it’s impact on the environment?

Answer 7

Start-stop systems

-automatically shuts down the engine when car is at rest, saving fuel consumption and emissions.