Quiz 2 compiled for BBL
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Questions and Answers

What is the principle behind the operation of strain gauges/load cells?

  • Change in electrical voltage
  • Change in electrical resistance (correct)
  • Change in electrical current
  • Change in electrical power

What is the main application of load cells?

  • Measuring force and weight (correct)
  • Measuring flow rate
  • Measuring pressure
  • Measuring temperature

What is the primary function of an LVDT?

  • Measure linear displacement (correct)
  • Measure pressure
  • Measure temperature
  • Measure vibration

What does an accelerometer measure?

<p>The vibration of motion of a structure (C)</p> Signup and view all the answers

What is the principle behind the operation of an accelerometer?

<p>Newton's Second Law of Motion (D)</p> Signup and view all the answers

How does a Capacitive MEMS Accelerometer detect acceleration?

<p>By exploiting the movement of a seismic mass, resulting in a capacitance change (B)</p> Signup and view all the answers

What is the principle behind the Piezoelectric effect?

<p>Generating electric charge from mechanical stress (A)</p> Signup and view all the answers

What is the primary function of a Water Flow Sensor?

<p>To measure the rate of flow of liquids (A)</p> Signup and view all the answers

What is the mechanism used in a Water Flow Sensor to measure fluid flow?

<p>Mechanical and electrical subsystems (A)</p> Signup and view all the answers

What is the output of a Rain Sensor?

<p>Both analog and digital (C)</p> Signup and view all the answers

What is the principle behind the operation of a Rain Sensor?

<p>Variable resistance (C)</p> Signup and view all the answers

What is another term for a Barometric Pressure Sensor?

<p>Pressure transducer (A)</p> Signup and view all the answers

What is the primary function of a Manometer?

<p>To measure the pressure of a fluid (A)</p> Signup and view all the answers

What is the significance of a Manometer in environmental studies?

<p>It measures atmospheric pressure and other environmental gases (A)</p> Signup and view all the answers

What is the principle behind the operation of RTDs?

<p>Change in electrical resistance with temperature (B)</p> Signup and view all the answers

What is the primary application of RTDs in industrial settings?

<p>Monitoring and controlling temperature (A)</p> Signup and view all the answers

What is the characteristic of thermistors that makes them suitable for lower temperatures?

<p>High sensitivity and nonlinearity (B)</p> Signup and view all the answers

What is the primary advantage of thermocouples?

<p>Wide temperature range and simplicity (C)</p> Signup and view all the answers

What is the characteristic of RTDs that makes them suitable for higher temperatures?

<p>Low sensitivity and linearity (A)</p> Signup and view all the answers

Which type of temperature sensor is the most commonly used?

<p>Thermocouple (A)</p> Signup and view all the answers

What is the purpose of the reference junction in a thermocouple?

<p>To maintain a constant temperature (B)</p> Signup and view all the answers

What is the principle behind the operation of TEG?

<p>Seebeck effect (A)</p> Signup and view all the answers

What is the output voltage of the LM35 temperature sensor?

<p>Proportional to temperature in Celsius (D)</p> Signup and view all the answers

What is the purpose of a TEC?

<p>To cool or heat electronic devices (C)</p> Signup and view all the answers

What is the characteristic of a bimetallic thermostat?

<p>It expands at different rates when heated (A)</p> Signup and view all the answers

What is the primary function of a photovoltaic cell?

<p>To convert light energy into electrical energy (C)</p> Signup and view all the answers

What type of device is used to amplify the photoelectric current generated from converting light energy?

<p>Phototransistor (B)</p> Signup and view all the answers

What is the characteristic of a photodiode that enables it to produce both voltage and current?

<p>Light-sensitive exposed junction (C)</p> Signup and view all the answers

What is the primary application of a Hall Effect sensor?

<p>Proximity switching and positioning (D)</p> Signup and view all the answers

What is the characteristic of the light beam produced by a laser diode?

<p>Concentrated and coherent (D)</p> Signup and view all the answers

What is the primary function of a proximity sensor?

<p>To detect the presence of an object (B)</p> Signup and view all the answers

What determines the color of the laser light?

<p>Type of semiconductor material used (D)</p> Signup and view all the answers

Which type of proximity sensor is useful for detecting metallic objects?

<p>Inductive Proximity Sensor (A)</p> Signup and view all the answers

What type of radiation is used by some proximity sensors to detect objects?

<p>Infrared radiation (IR) (B)</p> Signup and view all the answers

What is the function of a PIR sensor in security systems?

<p>To detect motion and trigger alarms (B)</p> Signup and view all the answers

What is the primary advantage of capacitive proximity sensors?

<p>Ability to detect both metallic and non-metallic objects (A)</p> Signup and view all the answers

What is the primary function of RF diodes?

<p>To efficiently control and manipulate RF signals (D)</p> Signup and view all the answers

What is the main application of electromechanical gas sensors?

<p>To detect the presence of gases in the atmosphere (A)</p> Signup and view all the answers

What is the principle behind the Electrode type salinity sensor?

<p>Measuring changes in conductivity (B)</p> Signup and view all the answers

What is the purpose of a Turbidity Sensor?

<p>To determine the particle concentration and purity of a solution (A)</p> Signup and view all the answers

What is the function of LDRs?

<p>To detect or sense light intensity (A)</p> Signup and view all the answers

What is the principle behind the operation of Infrared Spectroscopy breathalyzers?

<p>Measuring the absorption of infrared radiation by alcohol molecules (D)</p> Signup and view all the answers

How does an optical Heartbeat Sensor measure heart rate?

<p>By detecting changes in blood volume (B)</p> Signup and view all the answers

What is the principle behind the operation of Fuel Cell Breathalyzers?

<p>Oxidation-reduction reactions (B)</p> Signup and view all the answers

What is the primary method of calibration for relative magnetometers?

<p>By reference to a known, accurately measured magnetic field (C)</p> Signup and view all the answers

What is the primary function of a transducer in an ultrasonic sensor?

<p>To receive and send the ultrasonic sound wave (D)</p> Signup and view all the answers

What is the primary function of an E-Nose device?

<p>To detect the smell of complex volatiles (C)</p> Signup and view all the answers

How does a color sensor determine the color of an object?

<p>By processing electrical signals converted from light reflected from the object (A)</p> Signup and view all the answers

What is the primary function of a magnetometer?

<p>To measure the direction, strength, or relative change of a magnetic field (C)</p> Signup and view all the answers

How does an ultrasonic sensor determine the distance to a target?

<p>By measuring the time lapses between the sending and receiving of the ultrasonic pulse (D)</p> Signup and view all the answers

Study Notes

Strain Gauges/Load Cells

  • Principle of operation: Change in electrical resistance
  • Main application: Measuring force and weight

LVDT

  • Primary function: Measuring linear displacement

Accelerometers

  • Measure: Vibration of motion of a structure
  • Principle of operation: Newton's Second Law of Motion
  • Capacitive MEMS Accelerometer detects acceleration by exploiting the movement of a seismic mass, resulting in a capacitance change

Piezoelectric Effect

  • Principle: Generating electric charge from mechanical stress

Water Flow Sensors

  • Primary function: Measuring the rate of flow of liquids
  • Mechanism: Mechanical and electrical subsystems

Rain Sensors

  • Output: Both analog and digital
  • Principle of operation: Optical sensing

Barometric Pressure Sensors

  • Also known as: Pressure transducer, Manometer
  • Primary function: Monitoring atmospheric pressure

Manometers

  • Primary function: Measuring the pressure of a fluid
  • Significance in environmental studies: Measuring atmospheric pressure and other environmental gases

RTDs

  • Principle of operation: Change in electrical resistance with temperature
  • Primary application in industrial settings: Monitoring and controlling temperature

Thermistors

  • Characteristic: High sensitivity and nonlinearity
  • Suitable for: Lower temperatures

Thermocouples

  • Primary advantage: Wide temperature range and simplicity
  • Characteristic: High sensitivity and linearity
  • Suitable for: Higher temperatures

Temperature Sensors

  • Most commonly used: Thermocouple
  • Purpose of reference junction: To maintain a constant temperature

TEG

  • Principle of operation: Seebeck effect

LM35 Temperature Sensor

  • Output voltage: Proportional to temperature in Celsius

TEC

  • Purpose: To cool or heat electronic devices

Bimetallic Thermostat

  • Characteristic: Expands at different rates when heated

Photovoltaic Cells and Sensors

  • Primary function of a photovoltaic cell: to convert light energy into electrical energy
  • Device used to amplify the photoelectric current: phototransistor or photodiode
  • Characteristic of a photodiode that enables it to produce both voltage and current: P-N junction or light-sensitive exposed junction

Proximity Sensors

  • Primary function of a proximity sensor: to detect the presence of an object
  • Types of proximity sensors:
    • Inductive proximity sensor: useful for detecting metallic objects
    • Optical proximity sensor
    • Capacitive proximity sensor: can detect both metallic and non-metallic objects
    • Magnetic proximity sensor
    • PIR sensor: detects motion and triggers alarms in security systems

Radiation and Sensors

  • Radiation used by some proximity sensors to detect objects: infrared radiation (IR)
  • Primary function of a Hall Effect sensor: proximity switching and positioning
  • Primary function of a laser diode: produces a concentrated and coherent light beam

Gas Sensors

  • Primary function of RF diodes: efficiently control and manipulate RF signals
  • Primary function of electromechanical gas sensors: detect the presence of gases in the atmosphere
  • Principle behind the operation of Electrode type salinity sensor: measures changes in conductivity

Turbidity and Salinity Sensors

  • Primary function of a Turbidity Sensor: determines the particle concentration and purity of a solution
  • Primary function of LDRs: detects or senses light intensity
  • Principle behind the operation of Infrared Spectroscopy breathalyzers: measures the absorption of infrared radiation by alcohol molecules

Heartbeat and Fuel Cell Sensors

  • Primary function of an optical Heartbeat Sensor: measures heart rate by detecting changes in blood volume
  • Principle behind the operation of Fuel Cell Breathalyzers: electrochemical reactions

Magnetometers and Transducers

  • Primary function of a magnetometer: measures the direction, strength, or relative change of a magnetic field
  • Primary function of a transducer in an ultrasonic sensor: converts electrical signals to ultrasonic sound waves
  • Primary function of an E-Nose device: detects the smell of complex volatiles

Color Sensors

  • Primary function of a color sensor: determines the color of an object by processing electrical signals converted from light reflected from the object
  • Primary function of a magnetometer: measures the direction, strength, or relative change of a magnetic field

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Related Documents

Transducers Part 1 PDF
Transducers Part 2 PDF

Description

This quiz covers the principles and applications of strain gauges, load cells, and LVDTs in engineering measurements. Test your knowledge of sensors and their uses in various fields.

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