OUTPUT DEVICES

Question 1

It allows the computer to communicate with the outside world by accepting data from the computer and transforming it into a user-readable form

Answer 1

output device

Question 2

Various types of output devices:

Answer 2

1. Printers
2. Plotter
3. Video Display Terminal
4. Computer Output Microfilm

Question 3

A ___ produces the output from the computer on the paper. It is the most commonly used output device. It produce a hard copy i.e. a permanent copy of the results which can be stored and read later.

Answer 3

Printer

Question 4

Printers are classified as:

Answer 4

a) Impact Printer
b) Non-Impact Printer

Question 5

___ are similar to typewriters. They use a hammer to strike a character against an
inked ribbon and the impact of the hammer causes the image of the character to be printed
on paper. E.g. Dot matrix printers, line printers, daisy wheel printers

Answer 5

Impact printer

Question 6

Advantage of Impact Printers:

Answer 6

• Their functioning is relatively easy
• Multiple copies can be produced at the same time with the help of carbon paper.
• Impact printers are noisy in operation and are subject to wear and tear of mechanical parts.

Question 7

Type of Impact printers

Answer 7

1. Dot Matrix Printers
2. Daisy Wheel Printer
3. Line Printer

Question 8

Dot-matrix printer prints each character as a pattern of dots. The printer has a printer
head with a matrix of ___. Typical heads have a matrix of __ rows and _ columns. These pins produce a pattern of dots to form the individual characters.

Answer 8

pins(needles),
7 rows,
9 columns,

Question 9

These printers are relatively low in cost and print at speeds of 50-500 characters per second. __ are very commonly used
in most computer systems.

Answer 9

Dot matrix printers

Question 10

These printers are also called as letter-quality printers. These printers have a daisy wheel with several petals. The letter quality of these printers is much superior as compared to the
ldot matrix printers. But they are slow and typically print in the range of ___ characters
per second.

Answer 10

Daisy wheel printer,
10-50

Question 11

These type of printer are very fast printers that print at speed of 200-2500 lines per minute. These
printers are impact printers and normally have 132 print positions per line. Line printers are normally used in applications where large volumes of data are to be printed.

Answer 11

Line Printer

Question 12

Two types of line printers

Answer 12

a.) drum printers
b.) chain printers

Question 13

This consists of a metallic cylinder. On the surface of this drum, there are characters in bands. Each column or band on the drum contains all the characters. Opposite to each band, there is a hammer located behind the paper. The drum rotates at a fast rate. The hammer strikes the paper along with the inked ribbon and produces the output. One line
is printed in each revolution of the printer.

Answer 13

Drum printers

Question 14

In the ___, there is one print hammer for each print position on a line.
There is a fast-moving chain called the print chain. When this chain rotates, the print hammer and the inked ribbon strike the paper against the proper character on the chain.

Answer 14

Chain printers

Question 15

They use thermal, chemical, electrostatic, and inkjet technologies for printing as against
the hammer mechanism of impact printers. E.g. Laser printers, DeskJet printers.

Answer 15

Non- impact printer

Question 16

An ___ is a non-impact printer. It prints characters by spraying ink from tiny
nozzles onto the paper. A special type of ink which has a high iron content is used.

Answer 16

Inkjet printer

Question 17

These printers are used where a very superior quality output is desired. The image is created on a photosensitive drum; with a laser beam. The laser is turned on and off
when it moves back and forward across the drum. It leaves a negative charge on the drum to which a positively charged black toner powder sticks. When the paper rolls by the drum, the ink is transferred to the paper. Laser printers have a buffer memory to store
entire pages and hence their speed is very fast. The biggest advantage of these printers is that no mechanical movement is involved, therefore they are noiseless in operation.
However, there are comparatively expensive.

Answer 17

Laser printers

Question 18

It is an output device used in applications where printouts of graphs and drawings
are required.

Answer 18

Plotter

Question 19

Two types of plotters

Answer 19

a.) flatbed plotter
b.) drum plotter

Question 20

This plotter plots on a paper which is fixed on a rectangular flatbed table. One recording pen moves in the x-direction and one in the y-direction to plot on the paper. Color plotting
is also possible by using pens of different colors

Answer 20

Flatbed plotter

Question 21

In this plotter, the paper on which the output is to be obtained is placed over a drum. The drum rotates back and forth to produce motion. The pen is mounted horizontally across the drum and the horizontal motion of the pen is achieved with the help of the pen holder. The drum and the holder move simultaneously to produce output. Multicolored printing is possible by changing pens.
The speed of plotters is very slow. Therefore, normally the output is first sent to some secondary storage device like magnetic tape and then directed to the plotter.

Answer 21

Drum plotter

Question 22

An electron beam is moved across a phosphor-coated screen to produce the image. The CRT can be monochrome or colored. This screen normally has 25 lines and 80
characters.

Answer 22

CRT

Question 23

The most common flat panel display is the Liquid Crystal Display (LCD). This does not have a picture tube. The other type of display is the gas plasma screen.

Answer 23

Flat Panel Display

Question 24

The most popular output device indirect access processing is the __. These terminals display information instantaneously. The monitor and the keyboard together are called a ____.

Answer 24

Video Display Terminal, terminal

Question 25

Types of Terminal

Answer 25

1. Dumb terminal
2. Smart terminal
3. Intelligent terminal

Question 26

This is a combination of a keyboard and monitor which can send or receive data but cannot process the data.

Answer 26

Dumb terminal

Question 27

A __ has an inbuilt microprocessor. It can perform
arithmetic, logic, and control functions. They also have some memory capacity. So they
can store the data before sending it to the processor. They can also control the cursor movement.

Answer 27

Smart Terminal

Question 28

This type of terminal also has an inbuilt microprocessor which can
be programmed by the user. These terminals also have limited processing capability.
They can communicate with other terminals and processors.

Answer 28

Intelligent Terminal

Question 29

This technology is used to record the computer output as microscopic filmed images. Information is recorded on a roll of ____.

Answer 29

Computer Output Microfilm,

Microfilm

Question 30

A ___ displays the information
onto a screen. An inbuilt camera then takes pictures of this information. A _____ is used to view this information. COM devices are normally used in applications where there are large volumes of data.

Answer 30

microfilm recorder

Question 31

True or True

COM devices are much faster than normal printers. Also since the size of these films is very small the space required for storage is very less as compared to printed output.
However, since COM systems are highly sophisticated, they are relatively expensive and are mainly used where there are high volumes of data.

Answer 31

True siyempre