Principles of Operation of Devices

What printer uses dry powder ink instead of liquid ink?

• Inkjet Printer

• Plotter

• Laser Printer

What is the main principle behind a laser printer’s operation?

• Ink is sprayed directly onto paper

• Static electricity attracts toner to a drum

• Ink is melted and pressed onto paper

Which method is used in most 3D printers to build an object?

• Etching away from a solid block

• Injection moulding

• Layer-by-layer extrusion of filament

Which component in a speaker converts electrical signals to sound waves?

• Amplifier

• Transistor

• Voice coil and diaphragm

How does a microphone convert sound into an electrical signal?

• Condensation on a metal plate

• Sound waves cause a diaphragm to vibrate and alter current

• Laser scanning of air vibrations

Which of the following best describes how a magnetic hard disk stores data?

• Electric charge held in cells

• Light reflection from pits and lands

• Magnetic orientation on platters

Which of these is not a feature of solid-state drives (SSDs)?

• No moving parts

• Data stored using magnetic domains

• Faster access times than HDDs

How does an optical disc writer store data?

• Magnetic polarity is flipped

• Electrical charges are trapped

• Laser burns pits into the dye layer

In a capacitive touchscreen, how is the touch location detected?

• Pressure causes circuit layers to connect

• Conductive object alters electrical field

• Infrared light is interrupted

What is a key principle behind a virtual reality headset’s immersive display?

• Mechanical lenses reflect real surroundings

• Holographic projection

• Dual display and head tracking sensors simulate 3D