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23 questions
The binary number 00101010, when converted to decimal is ___
24
32
42
48
The acronym ALU stands for a computer's ___
accepted language utility
advanced logarithmic unit
arithmetic and linguistic utility
arithmetic and logic unit
The first complete ALU that fit entirely inside a single chip was released in ___
1970
1984
1957
1948
The handling of all numerical operations in a computer is done by ___
the logic unit
the arithmetic unit
the linguistics unit
random access memory
The addition of binary numbers can be described using four logic gates; ___
XAND, OR, NOT and XOR
AND, OR, NOT and ELSE
AND, OR, NOT and XOR
AND, IF, NOT and OR
Remember that in binary, 1 and 0, respectively, are the same as ___
up and down
left and right
go and stop
true and false
Which logic gate almost exactly describes the addition of two binary numbers?
an AND gate
a NOR gate
a NAND gate
an XOR gate
When adding two binary numbers, which logic gate is used to calculate the carry bit?
an AND gate
an OR gate
a NAND gate
an XOR gate
The circuit that sums A and B, and has two outputs, sum (S) and carry (C), is called ___
a half adder
a full adder
a simple summer
a digital combiner
A digital circuit that sums two numbers, and includes a carry bit (C) as input is called ___
a half adder
a full adder
a partial compiler
a complete compiler
In a full adder, which logic gate is used to check if either one of the carry bits is true?
an OR gate
an AND gate
an XOR gate
a NAND gate
In an 8-bit adder, which component is used for the addition of the first bits?
a half adder
a full adder
a full compiler
a partial summer
In an 8-bit adder, which component is used when there's a carry bit from a previous operation?
a half adder
a full adder
a full compiler
a partial summer
When carry bits are progressively passed forward to each subsequent adder, it's called ____
a carry forward adder
a ripple carry adder
a surge forward adder
a trickle ahead adder
A carry into the ninth bit, of an 8-bit adder, is called ___
an error
an overflow
a carry-over
a white-cap ripple
Which level of the original Pac-Man arcade game caused an overflow in the 8-bit ALU?
Level 64
Level 128
Level 256
Level 512
To add binary numbers, modern computers use a fast adding circuit called a ___
carry-lookahead adder (CLA)
ripple carry algorithm (RCA)
custom digit adder (CDA)
forward carry algorithm (FCA)
What operations are not included in simple ALUs?
negate and pass-through
increment and decrement
subtract and borrow
multiplication and division
Simple numerical tests, like checking if a number is negative, are performed by ___
the arithmetic unit
the logic unit
the addition unit
the linguistic unit
The first complete ALU on a single chip was the 74181. How many bits could it process at once?
2 bits
4 bits
8 bits
16 bits
As another level of abstraction, an 8-bit ALU is represented by a symbol which looks like ___
a big Y
a big X
a big V
a big A
ALUs output 1-bit states and statuses, such as "overflow" and "negative", called ___
banners
ripples
waves
flags
Fancy ALUs will have more flags, but the three flags that are universal and frequently used are ___
Stack, Zero and Negative
Stack, Overflow, and Negative
Overflow, Zero, and Negative
Overflow, Zero, and Stack
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