ALU 101 Data Representation and Number Systems 3

Question 1

Adding 0111 + 0001 in 4-bit two's complement produces which result and flag?

Accepted Answer

1000, Overflow set

Answer

0000, Zero set

Answer

1000, Carry set

Answer

0110, No flags set

Question 2

What does the term 'word size' define in the context of an ALU?

Accepted Answer

The number of bits the ALU processes in a single operation

Answer

The number of instructions the ALU supports

Answer

The clock frequency of the ALU

Answer

The number of registers in the CPU

Question 3

Which representation is used internally by modern ALUs for signed integer arithmetic?

Accepted Answer

Two's complement

Answer

Sign-magnitude

Answer

One's complement

Answer

Excess-N

Question 4

What is the decimal value of the 8-bit two's complement number 10000000?

Accepted Answer

-128

Answer

-127

Answer

128

Answer

-0

Question 5

How does an ALU typically represent the number zero in two's complement?

Accepted Answer

As a single unique pattern of all zeros

Answer

As all ones

Answer

As two different bit patterns

Answer

As the carry-out bit only

Question 6

Which format does the ALU's floating-point unit use to represent very small numbers near zero?

Accepted Answer

Denormalized (subnormal) numbers

Answer

Normal floats with large negative exponents

Answer

Integer with scaling

Answer

BCD encoding