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level: Output devices

Questions and Answers List

level questions: Output devices

QuestionAnswer
Give three advantages of hardcopyPermanent Portable Easier to make copies
Give an advantage for softcopyEasier to edit( Used for outputs that are continuously changing)
Give four advantages of Audio outputsSuitable for disabled people(blind) The output is given to many people simultaneously Attracts the user User can be far away from the system
Give three disadvantages for audio outputDisturbs the enviroment(Not suitable for enviroment such as hospitals and libraries) Cannot be heard in noisy enviroments As message is not permanent it has to be repeated
What are the two types of printers?Ink jet printers Laser printers
What are the two types of ink jet printers?Peizoelectric Thermal bubble
How does a thermal bubble printer work?Tiny resistors create localised heat which makes ink vaporise , which causes the ink to form a tiny bubble, which expands causing the ink to eject out of the printhead When the bubble collapses, a vacuum is created causing fresh ink to be drawn into the printhead The process is repeated until the printing cycle is complete
How does a peizoelectric printer work?A crystal is located at the back of the ink reservoir for each nozzle. The crystal is given a tiny electric charge which makes it vibrate, which causes ink to be ejected on to the paper. Simultaneously more ink is brought in The process is repeated till the printing cycle is complete
What are the four main parts of a ink jet printer?A print head which consists of nozzles which spray ink onto the paper to form characters An ink jet cartridge for blue, yellow, magenta and black cartridge or single containing all Stepper motor and belt which moves the print head from side to side across the page A paper feed which automatically feeds the printer the pages
Give three features of the laser printerUses dry powder ink Uses static electricity to produce text and images Prints the whole at one go
Give four differences between ink jet and laser printerLaser printers use toners , ink jet uses cartridge Laser printer is faster Laser printer has better quality Laser printer is used for larger quantities
What is a 3D printer ?A device which produces three dimensional objects
What materials can be used by 3D printer?Ceramic Metal Resin Wood Granite
What are the advantages of 3D printers ?Can manufacture products much faster Products manufactured are cheaper
What are the disadvantages of 3D printers?Violation of copyright leads to unemployment People will have access to dangerous technologies
What is a 2D cutter?Device used to engrave characters on a flat surface such as nameplates, tombstone, wooden furniture
What is a 3D cutter?Device used to create 3D objects by cutting away material from a block, they are capable of cutting designs inside the object.
What are the materials that can be used by the 3D cutter?Glass Jade Metal Wood Polymer
What are the three type of monitors?LCD(Liquid Crystal Display) LED(Light Emitting Diode) OLED(Organic Light Emitting Diode)
How does a LCD work?Uses a Cold Cathode Flourescent Lamp(CCFL) to emit light onto a grid of liquid crystals
What does an LED do?An LED backlight is used to emit light on the LCD panel
What is OLED?Organic material embedded between metallic rocks which glow when supplied with electricity
What is the advantage of LCD?Cheaper
What are the advantages of LED ?Brighter picture Less electricity consumption Shorter time to reach maximum brightness Longer lifetime
What are the advantages of OLED? Give two applicationsLess electricity consumption No backlight(thinner) Bendable Mobile phones Advertising screens
What are the advantages of projectors?Portable Larger audience Adjustable screen size
What are the disadvantages of projectors?lower quality than monitors Time consumed to set up the projector
What are the three types of touchscreens ?Capacitive Resistive Infa-red
How does capacitive touch screens work?It contains several layers of glass with electricity flowing between them, when a person touches the screen the electricity in that area passes out of the device through the body This change is detected by the microprocessor to identify where the screen was touched
What are the advantages of capacitive touchscreens?Cheap Durable Visible in bright light Multitouch
What are the disadvantages of capacitive touchscreens?Only works when touched by hands, stylus and capacitive gloves
How does a resistive touchscreen work?Consists of a polyester sheet below which there is a glass sheet. When a person touches the screen, the polyester screen touches the glass and the circuit is complete. When it is complete, the microprocessor can identify where the screen was touched
What are the advantages of a resistive touchscreen?Cheaper You can use bare fingers, stylus or glove
What are the disadvantages of resistive touchscreens?Not durable Not multitouch Not very clear in bright light
How does a infra-red touch screen work?A grid of infrared light sources and sensors are used to detect where the person touches the screen, when the screen is touched the infrared light beam is interupted and the location of the touch can be identified
What are the advantages of infrared touchscreens ?Less affected by scratches on the surface of the device You can use use it bare finger, gloves and stylus Multitask is possible
What are the disadvantages of Infrared?Dust particles may produce incorrect touches Moisture and water will affect the proper working of the screen
Where is capacitive touchscreens used?Mobile phones
Where are infrared used?ATM Ticketing system Medical equipment