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level: Sensors

Questions and Answers List

level questions: Sensors

QuestionAnswer
What is a sensor?Sensor is a device which reads and measure physical properties
Physical data are known as what dataAnalogue data which means that they are constantly changing and dont have a constant value
Why do we convert analogue data to digital data? What do we use to convert it?because computer cannot interpret analogue data. We use a Analogue to Digital Converter (ADC)
What is ADC used with?An actuator which requires DAC to receive electric current
What is an actuatora type of electromechanical output device used to control something
What is required when computers are used to control device?A digital to analogue converter (DAC)
List the nine types of sensorstemperature, moisture, light, motion, pressure, sound, gas, pH, magnetic field
What are the two keywords in describing each sensormonitoring and controlling
What are the 3 uses of temperature sensor1. controlling a central heating system 2. control and monitor a chemical process 3. control and monitor temperature of greenhouse
What are the 2 uses of moisture sensor1. control and monitor moisture level of soil and air in greenhouse 2. monitors dampness of industrial application
What is the 3 use of light sensorcontrol street light, headlight in car, lights in greenhouse
What are the three uses of motion sensor1. monitors intrudes in burglar alarm system 2. Control sensor doors in malls 3. Controls wind screen wipers in car
What are the 3 uses of pressure sensor1. monitor intrudes 2. control weighing system 3. control and monitor gas pressure related process
What are the 2 uses of sound sensor1. monitor intrudes 2. monitor noise of liquid dripping for pipe
What is the 3 use of gas sensor1. monitor pollution in water/air 2. monitor O2 and CO2 in green house 3. Monitor CO2 leaks in power stations
What is the two use of pH sensor1. controlling and monitoring acidity and alkalinity of soil in greenhouse 2. monitor pollution in water
What is the 2 use of magnetic field1. control anti-lock breaking system of cars 2. controlling application involve magnetic field charges (cell phone)
How does a sensor work?1. Sensor sends signal to computer 2. Signals are then converted to digital using ADC 3. Computer checks data received against store values 4. if received data is outside range of control system, control or monitor action will happen depending on the situation 5. number of minutes pass before next reading
After a signal is send by sensor to computer, what happens?signals are converted into digital data using ADC
When signals are converted into digital data using ADC what happens?computer checks data received against store values