Input Devices

Q.       Define Input device.

Ans.: Input device: An input device is an electromechanical device that accepts data from outside word and translates them into a computer can interpret. Several input devices are available today. We classify them broadly into following categories:

                  1. Keyboard devices

                  2. Point-and-draw devices

                  3. Data scanning devices

                  4. Digitizer

                  5. Electronic cards based devices

                  6. Speech recognition devices

                  7. Vision based devices.

Q.       Define output device.

Ans.: Output device: An output device is an electromechanical device that accepts data from a computer and translates them into a form suitable for use by outside world (users). Several output devices are available today. We classify them broadly into following categories:

                              1. Monitors.

                              2. Printers.

                              3. Plotters.

                              4. Screen image projector

                              5. Voice response system.

Q.       Describe the function of scanner.

Ans.: Basic functions of the scanner:

·   The scanner provides copy, fax, and scan-to-network capability for large workgroups. You can:

·   Make quick copies, or change the settings on the printer control panel to perform specific copy jobs.

·   Send a fax using the printer control panel.

·   Send a fax to multiple fax destinations at the same time.

·   Scan documents and send them to your computer, an e-mail address, a flash drive, or an FTP destination.

·   Scan documents and send them to another printer (PDF by way of FTP).

Q.       Write down the applications of scanner.

Ans.: Applications of scanner: An image scanner is an input device, which translates paper documents into and electronic format, which can be stored in a compute. The input documents may be typed text, pictures, graphics, or even handwritten material. This input device has been found to be very useful in preserving paper documents in electronic form. The copy of a document stored in a computer in this manner will never deteriorate in quality and can be displayed or printed, whenever desired.

Q.       Describe the functions of MICR.

Ans.: MICR refers to Magnetic-ink Character Recognition was developed by the Stanford Research Institute of USA for use by the Bank of America. This system can read data prerecorded on checks and deposit slips with a special ferrite-impregnated ink. The magnetized characters can be read and interpreted by MICR equipment. The American Bankers Association (ABA), in the mid-1950s, adopted the magnetic-ink character recognition (MICR) technology, as its primary means for processing checks. This technology involves reading of numeric characters and a few special symbols printed on cheques with magnetic ink.

Q.       What is OMR?

Ans.: OMR:

·   Optical Mark Reader.

·   It is used to read marks off hard copies.

·   Recognize the presence or absence of marks in pre-determined positions on a sheet of paper.

·   Used for automatically marking multiple choice exams.

·   Collating results from surveys and census etc.

Q.       What is OCR?

Ans.: OCR:

·   Character recognition can be accomplished by just registering characters and specifying the area.

·   Both alphanumeric characters and user-defined characters can be identified.

·   The Auto calendar setting allows inspection of the date or lot numbers without the need for daily setting change.

Q.       Describe two most common input and output devices.

Ans.: Input device(Keyboard): The keyboard was one of the first peripherals to be used with computers, and it is still the primary input device for entering text and numbers. A standard keyboard includes about 100 keys; each key sends a different signal to the CPU.

Output Device(Monitor): The monitor is the most commonly used output device on most personal computer systems. Two types of monitor one is CRT (Cathode Ray Tube) and another one is Flat-Panel Monitor.

Q.       What is Bar-code reader?

Ans.: A barcode reader: A barcode reader (or barcode scanner) is an electronic device for reading printed barcodes. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating optical impulses into electrical ones.

  

Q.       What are the functions of Bar-code reader?

Ans.: Functions of Bar-Code reader: The barcode scanner consists of a laser source and a photo sensor. The scanner decodes the barcode into electrical signals and gives to the computer. The computer must have barcode scanner software installed in it. The barcode scanner software helps to convert the electrical signals from the barcode scanner to numbers and letters. There are different types of Barcode Scanners available as per use.