What is a Line Printer? How can it vary from a Dot Matrix printer?

A printer may be a manifestation of speedy impact printer during which a line of kind is written right away. Print velocities of 600 lines to 1200 lines/mt is traditional. There are 3 basic kinds of line printers. They are:

1. Drum Printers

2. Chain Printers

3. Bar Printers

A matrix Printer utilizes a head that hold a lattice of pin heads. depending on the character to be written, a collection of pin heads from the network is somewhat anticipated outward to structure the state of character to be written. This head gathering moves from one finish of sheet to flip aspect during a line printing one character right away. Head strikes a lace that is unbroken over the paper and build a bearing of the anticipated pins.


What is Optical Mark Reader (OMR) ?

OMR may be a special scanning device that may browse fastidiously placed pencil marks on specially designed documents. OMR is often employed in forms, questionnaires and answer sheets. Trendy OMR will browse black or blue marks created with ball purpose pen or fel tip pen yet as pencil, punched and written marks. Traditional scan space includes twelve rows at zero.25 in. centers * 126 mark positions and scanning speed twenty five inches per second.

What is Magnetic Ink Character Reader (MICR) ?

MICR could be a character recognition technology adopted principally by the banking system to facilitate process of cheques. MICR uses predefined shapes for characters. MICR characters are written with a ink or toner. Magnetic printing is employed so the characters will be reliably browse in an exceedingly system even once they are overprinted with alternative marks like cancellation stamps. MICR reader is comparable to audio magnetic recorder head. The letter forms make sure that every letter produces a novel wave shape for the browse head. MICR is employed by the banks. Because the head of MICR reader moves over the characters, in line with the character, a novel wave shape is generated.


What is data hiding in a program?

Data hiding could be a key feature of object familiarized programming. It implies that data is hide inside a category so it can't be accessed erroneously by functions outside the category. The first mechanism for concealment knowledge is to place it in an exceedingly category and build it non-public. Private data or functions will solely be accessed from inside the category. Non-private data or functions square measure accessible from outside the category. Data hiding offer a mechanism to protect well intention-ed programmers from creating mistakes.