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D-These sensors use ultrasonic (to detect changing liquid levels in, for example, a tank) or capacitance/ conductivity (to measure static levels (for example, height of water in a river) – note, level sensors can also be optical or mechanical in nature.

A-
- monitor levels in a petrol tank in a car.
- in a pharmaceutical process where powder levels in tablet production need to be monitored.
- leak detection in refrigerant (air conditioning).

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D - These sensors measure the flow rate of a moving liquid or gas and produce an output based on the amount of liquid or gas passing over the sensor

A-
- used in respiratory devices and inhalers in hospitals.
- measure gas flows in pipes (for example, natural gas).

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D - These use an invisible beam of infrared radiation picked up by a detector; if the beam is broken, then there will be a change in the amount of infrared radiation reaching the detector (sensor)

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D - These sensors measure the heat radiation given off
by an object, for example, the temperature of an
intruder or the temperature in a fridge.

A -
- security alarm system (detects body heat).
- monitor the temperature inside an industrial freezer or chiller unit.

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D - These sensors measure changes in magnetic fields
– the signal output will depend on how the magnetic
field changes.

A -
- detect magnetic field changes (for example, in mobile phones and CD players).
- used in anti-lock braking systems in cars.

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A -
- turn on car windscreen wipers automatically when it detects rain on the windscreen.
- security alarm system (intruder breaks the infrared beam)

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D- Light sensors are a type of photodetector (also called photosensors) that detect light. Different types of light sensors can be used to measure illuminance, respond to changes in the amount of light received, or convert light to electricity.

A- Consumer electronics ranging from compact disc players to smoke detectors and even remote control devices. Medical applications such as equipment/instruments used for measuring and analysis purposes. Solar energy systems such as solar panels.

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D-the sensors measure the pressure of fluids( water/air).

A-
-measure the pressure in a cockpit/cabin of an aircraft
-measure the atmospheric pressure to determine the depth.
-measure atmospheric pressure to predict the weather

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D: A passive device that converts the light energy into an electrical signal output. Commonly known as Photoelectric Devices or Photo Sensors
E: Solar panels, it converts light energy into DC electrical energy in voltage or current

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They are devices to measure temperature readings through electrical signals. The sensor is made up of two metals, which generate electrical voltage or resistance once it notices a change in temperature.

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D - A sound sensor is defined as a module that detects sound waves through its intensity and converting it to electrical signals

A - Examples of sound sensors include acoustic pressure sensors and pressure microphones

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D: Light sensors detect light and convert light energy to an electrical signal output.
A: cell phones and tablets

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D - senses, measures and reports both moisture and air temperature ; detect changes that alter electrical currents or temperature in the air

A - owens, food dehydration, clothes dryers, drying machines

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D - These sensors are able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation, and looks for changes in the field or return signal.

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D - device or instrument which is able to measure the pressure in gases or liquids.

A -

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D-This type of sensor is able to measure the amount of alkalinity and acidity in water and other solutions. When used correctly, pH sensors are able to ensure the safety and quality of a product and the processes that occur within a wastewater or manufacturing plant.

A-ph meter

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D - Seismic sensor is an instrument used for measuring ground motion.

A -
- It measures ground motion in a dynamic manner.
- Modern seismic sensors include geophones that measure velocity or accelerometers that measure acceleration of the ground.

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D - These are sensors that measure acceleration and motion of an application, i.e. the change in velocity
(a piezoelectric cell is used whose output varies according to the change in velocity)

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Fire alarm equipped with temperature sensor , when it senses heat it will ring and water will released out .

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A -
- used in cars to measure rapid deceleration and apply airbags in a crash
- used by mobile phones to change between portrait and landscape mode.

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A-These are commonly used to detect toxic or explosive gases and measure their gas concentration.  Gas sensors are used in factories and manufacturing facilities to identify gas leaks and detect smoke and carbon monoxide in the home.

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D- Gas sensor are elctronic devices that detect and identify differnet type of gases. They are commonly used to detect toxic or explosive gasses and measure gas concentration. For example indoor air quality sensor

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D - measures water levels in, for example, soil (it is based on the electrical resistance of the sample being monitored).

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A -
- control/monitor moisture levels in soil in a greenhouse
- monitor the moisture levels in a food processing factory

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A - Used in phones, self-driving cars

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light sensor is a passive device that converts light energy to a signal output.

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A -
- weighing of lorries at a weighing station
- measure the gas pressure in a nuclear reactor

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A -
- monitor/control acidity levels in the soil in a greenhouse
- control acidity levels in a chemical process