Which of the following is not a type of printer ?

The correct answer is (d), Word Printer.

A line printer is a type of printer that prints one line of text at a time. It is an impact printer, which means that it uses a hammer to strike an inked ribbon against the paper, causing the ink to be transferred to the paper. A drum printer is also an impact printer, but it uses a rotating drum with characters on it to print the text. A word printer is not a real type of printer. It may have been used in the past to refer to a type of printer that prints one word at a time, but this is not a common term today.

Here is a more detailed explanation of each type of printer:

• Line printer : A line printer is a type of printer that prints one line of text at a time. It is an impact printer, which means that it uses a hammer to strike an inked ribbon against the paper, causing the ink to be transferred to the paper. Line printers are typically used for printing large amounts of text, such as reports or invoices.
• Impact printer : An impact printer is a type of printer that uses a physical impact to transfer ink to paper. This is in contrast to non-impact printers, which use other methods such as laser or inkjet technology. Impact printers are typically slower than non-impact printers, but they are also more durable and can print on a wider variety of paper types.
• Drum printer : A drum printer is a type of impact printer that uses a rotating drum with characters on it to print the text. The drum is coated with ink, and the characters are raised above the surface of the drum. As the drum rotates, the characters are pressed against the paper, causing the ink to be transferred to the paper. Drum printers are typically used for printing large amounts of text, such as reports or invoices.
• Word printer : A word printer is not a real type of printer. It may have been used in the past to refer to a type of printer that prints one word at a time, but this is not a common term today.