Data Processing Circuits

Question 1

How many inputs does a half adder accept ?

Answer 1

2 binary inputs

Question 2

How many outputs does a half adder produce ?

Answer 2

Two. Sum & Carry bit

Question 3

What is a parallel binary adder ?

Answer 3

Two or more connected full adders

Question 4

What is a nibble ?

Answer 4

A group of four bits

Question 5

What is an application of adders (full and parallel) ?

Answer 5

Simple voting system

Question 6

What does a comparator do ?

Answer 6

Compare the magnitude of two binary quantities

Question 7

What does a encoder do ?

Answer 7

Detects presence of a specified combination of bits on its inputs

Question 8

What are the two main data selection circuits ?

Answer 8

MUX and DE- MUX

Question 9

What does a multiplexer do ?

Answer 9

Forwards a selected input into the output line

Question 10

How many output lines are there in a multiplexer ?

Answer 10

One single output line

Question 11

How does it choose the input signal ?

Answer 11

By application of a control signal

Question 12

If a MUX has n select lines, how many inputs can it take ?

Answer 12

2^n

Question 13

What is the schematic diagram of a multiplexer ?

Answer 13

An isosceles trapezium

Question 14

What does the longer parallel side of the trapezium contain ?

Answer 14

Input pins

Question 15

What does the shorter parallel side of the trapezium contain ?

Answer 15

Output pin

Question 16

What is a demultiplexer ?

Answer 16

Data Distributor circuit

Question 17

How many inputs does a demultiplexer have ?

Answer 17

One

Question 18

What does a demultiplexer do with this single input ?

Answer 18

Switches it to an output line

Question 19

How many output lines get the signal at a time ?

Answer 19

Only one

Question 20

How is the output line selected ?

Answer 20

Via the Control signal

Question 21

How are a multiplexer and demultiplexer connected together ?

Answer 21

The single output of a MUX is connected to the single input

Question 22

How does a multiplexer-demultiplexer combo save cost ?

Answer 22

No need of one device per input signal.

Several signals share a device

Question 23

What is a nibble multiplexer ?

Answer 23

Selects one of two nibbles(4 bits) at a time

Question 24

Can a large multiplexer be implemented with smaller multiplexers ?

Answer 24

Yes. 16-1 can be implemented by two 8-1’s and one 2-1,

And likewise

Question 25

What is the difference in between a demultiplexer and a decoder ?

Answer 25

Decoders have on data input

Question 26

What does even parity mean, for n bits ?

Answer 26

There are an even number of 1’s

Question 27

What does odd parity mean, for n bits ?

Answer 27

There are an odd number of 1’s