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## 2009_1 Eexams Past Questions: Cit292 - Computer Laboratory I

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Mathew Oluwaseun
University of Ilorin (Unilorin)
Mechanical Engineering
500Level, Nigeria. In Boolean algebra, the OR operation is performed by __ properties

All of the options

Which of the following represents DeMorgan’s theorem?

(AB)’ = A’ + B’

A Karnaugh map (K-map) is an abstract form of ____ diagram organized as a matrix of squares.

Venn

A product term containing all K variables of the function in either complemented or uncomplemented form is called a ___.

Minterm

Canonical form is a unique way of representing___

Boolean expressions

A full adder logic circuit has __.

Three inputs and two outputs

Exclusive-OR (XOR) logic gates can be constructed from which of the following logic gates?

AND gates, OR gates, and NOT gates

The ___ function can be used to enable.

AND

Boolean algebra is also called ___

Switching algebra

First operator precedence for evaluating Boolean expressions is __

( )

In a __ counter all the Flip-flops will change states simultaneously

parallel

Any Boolean function can be represented in a

Truth table

In D flip-flop, if clock input is LOW, the D input

Goes high

Which of the following expression depicts complement of the expression A’B + CD’ ?

(A + B’)(C’ + D)

The Octal to binary conversion of 248 = ?

1111002

A Boolean function is said to be in a ___ form if a sum-of-products expression or a product-of-sums expression has at least one term that is NOT a minterm or a maxterms respectively

standard

Odd parity of word can be conveniently tested by _ gate.

XOR

The code where all successive numbers differ from their preceding number by single bit is _.

Excess 3

__ circuit is generated from D flip-flop due to the addition of an inverter by causing reduction in the number of inputs.

Gated D-latch

How many types of sequential circuits do we have?

2

In a NAND based S’-R’ latch, if S’=1 and R’=1 then the state of the latch is:

No change

Boolean algebra is an algebraic structure with ___ arithmetic operations

Two

__ is an odd function

Exclusive-OR

X+0=0+x =x is an example of _ property

Commutative

Which of the following is not one of the arithmetic operations of Boolean algebra?

subtraction

Which of the following logic families has the shortest propagation delay?

AS-TTL

A Boolean function can be converted from algebraic expressions to a product of maxterms by using __

Canonical Conversion Method

LED seven-segment display uses seven individual -----------

Light emitting diodes

Which of the following combinational circuits is renowned for selecting a single input from multiple inputs and directing the binary information to output line?

Data Selector

Minterms are also referred to as Standard ____

product

The gates required to build a half adder are __.

EX-OR gate and AND gate

A universal logic gate is one which can be used to generate any logic function. Which of the following is a universal logic gate?

NAND

____ is the process involved in recording music or any audio in a recorder.

Encoding

A variable on its own or in its complemented form is known as a ____

Literal

Using the transformation method you can realize any POS realization of OR-AND with only __

NOR
Code is a symbolic representation of ____ information.

Discrete
A three-digit decimal number requires __ number of bits for representation in the conventional BCD format.

12
An encoder can be a transducer. TRUE or FALSE?

TRUE
The process of representing numbers, letters or words by a special group of symbols is called ___

Encoding
The bistable element has __ symmetrical nodes

two
The action of clearing a Flip-Flop is also called __.

resetting
To perform product of maxterms, Boolean function must be brought into __ terms.

OR
A Boolean function may be transformed into ___ diagram

logical
Boolean algebra is defined as a set of Two __

values
A helpful illustration used to visualize relationships among variables of Boolean expression is __ diagram

Venn
NAND is a complement of ___

AND
Inverter circuit inverts logic sense of ___ variable

Boolean
+ symbol represents __ operation

OR
Truth table is way of expressing ____ function

Boolean
Symbol representing AND operation is ___

.
In the equation a*b=c, * is the binary ___

operator
Complement of function F is written as __

F’
The D flip-flop has ___ input.

1
The truth table for an S-R flip-flop has how many VALID entries?

3
(X')' is a ___ complement

dual
In D flip-flop, D stands for __

Delay
The D flip-flop has how many output?.

2
In __ systems, the outputs of logic circuits can change state any time that one or more of the inputs change.

asynchronous
At every active edge of the clock, the _ flip-flop will load in a new value.

D
The characteristic of J-K flip-flop is similar to ___ flip-flop

S-R
NOR is a complement of

OR
It is not possible to find two algebraic expressions that specify same function? TRUE or FALSE?

FALSE
An encoder can be referred to as multiplexer. TRUE or FALSE?

TRUE
A J-K flip-flop is said to have ___, if J=1, K=1.

toggle
Boolean algebra is collection of objects having __ properties.

Common
According to Boolean algebra Involution law, (Y')' = __

Y
In parts of the processor, ___are used to calculate Addresses, Table indices, and increment or decrement operators

___ subtractor is used to perform subtraction of 3 bits

Full
A single ___ can be used to build the ‘NOT’ digital logic gates

transistor

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