Sensors and Transducers Objective Questions and Answers
Explore the realm of sensors and transducers with our extensive collection of objective questions and answers. Covering a wide range of topics, including types of sensors, principles of operation, applications, and troubleshooting, this comprehensive Q&A guide is designed to deepen your knowledge. Prepare for exams, expand your expertise, or simply satisfy your curiosity in the fascinating field of sensors and transducers with our reliable resources.
Sensors and Transducers Objective Questions
What is the function of a sensor?
a. To convert physical quantities into electrical signals
b. To convert electrical signals into physical quantities
c. To measure the speed of a moving object
d. To control the temperature of a system
Answer: a
Explanation: A sensor is a device that is used to convert physical quantities such as temperature, pressure, or humidity into electrical signals that can be measured and analyzed.
Which of the following is a type of temperature sensor?
a. Thermocouple
b. Accelerometer
c. Pressure sensor
d. Proximity sensor
Answer: a
Explanation: A thermocouple is a type of temperature sensor that is used to measure temperature by measuring the voltage between two different metals that are joined at one end.
Which of the following is a type of pressure sensor?
a. Strain gauge
b. pH sensor
c. Temperature sensor
d. Flow sensor
Answer: a
Explanation: A strain gauge is a type of pressure sensor that measures the strain or deformation of a material when it is subjected to pressure.
What is the function of a transducer?
a. To convert electrical signals into physical quantities
b. To measure the speed of a moving object
c. To control the temperature of a system
d. To convert physical quantities into electrical signals
Answer: a
Explanation: A transducer is a device that is used to convert electrical signals into physical quantities such as pressure, temperature, or flow rate.
Which of the following is a type of flow sensor?
a. Thermocouple
b. Strain gauge
c. pH sensor
d. Turbine flow meter
Answer: d
Explanation: A turbine flow meter is a type of flow sensor that measures the flow rate of a fluid by measuring the rotation of a turbine in the fluid stream.
Which of the following is a type of level sensor?
a. pH sensor
b. Ultrasonic sensor
c. RTD
d. Accelerometer
Answer: b
Explanation: An ultrasonic sensor is a type of level sensor that measures the distance to a target using sound waves.
What is the function of a pH sensor?
a. To measure the temperature of a system
b. To measure the flow rate of a fluid
c. To measure the acidity or alkalinity of a solution
d. To measure the pressure of a system
Answer: c
Explanation: A pH sensor is a device that is used to measure the acidity or alkalinity of a solution by measuring the voltage between two electrodes that are placed in the solution.
Which of the following is a type of proximity sensor?
a. Photoelectric sensor
b. Strain gauge
c. Turbine flow meter
d. Accelerometer
Answer: a
Explanation: A photoelectric sensor is a type of proximity sensor that detects the presence of an object by measuring the amount of light that is reflected or absorbed by the object.
What is the function of an accelerometer?
a. To measure the temperature of a system
b. To measure the flow rate of a fluid
c. To measure the acceleration of a moving object
d. To measure the pressure of a system
Answer: c
Explanation: An accelerometer is a device that is used to measure the acceleration of a moving object by measuring the changes in velocity over time.
Which of the following is an example of a piezoelectric sensor?
A. Thermocouple
B. Strain gauge
C. Accelerometer
D. Photodetector
Answer: C
Explanation: A piezoelectric sensor works on the principle of the piezoelectric effect, which is the generation of an electric charge in response to applied mechanical stress. An accelerometer is an example of a piezoelectric sensor, as it measures acceleration by detecting the mechanical stress caused by acceleration.
Which of the following sensors is used for measuring temperature?
A. Strain gauge
B. Thermocouple
C. Photodetector
D. Accelerometer
Answer: B
Explanation: A thermocouple is a type of temperature sensor that measures temperature by detecting the voltage produced when two dissimilar metals are joined at one end and heated at the other end. The voltage produced is proportional to the temperature difference between the two ends.
Which of the following is a non-contact type sensor?
A. Strain gauge
B. LVDT
C. Potentiometer
D. Ultrasonic sensor
Answer: D
Explanation: An ultrasonic sensor is a non-contact type sensor that uses ultrasonic waves to detect the distance of an object. The sensor emits ultrasonic waves, which bounce off the object and are received by the sensor. The time taken for the waves to travel to and from the object is used to determine the distance of the object from the sensor.
Which of the following is an example of an active transducer?
A. Strain gauge
B. LVDT
C. Thermistor
D. Photodetector
Answer: C
Explanation: An active transducer is a type of transducer that requires an external power source to operate. A thermistor, which is a temperature-sensitive resistor, is an example of an active transducer as it requires a power source to measure temperature changes.
What type of transducer is used to convert temperature changes into electrical signals?
a. Thermocouple
b. Potentiometer
c. Strain gauge
d. Load cell
Answer: a. Thermocouple
Explanation: A thermocouple is a type of temperature transducer that converts temperature changes into electrical signals by utilizing the Seebeck effect.
What type of sensor is used to measure pressure?
a. Strain gauge
b. Thermocouple
c. Piezoelectric sensor
d. LVDT
Answer: c. Piezoelectric sensor
Explanation: A piezoelectric sensor is a type of pressure sensor that uses a piezoelectric crystal to convert pressure changes into electrical signals.
Which of the following is an example of a contact-type sensor?
a. Thermocouple
b. Photoelectric sensor
c. Capacitive sensor
d. Limit switch
Answer: d. Limit switch
Explanation: A limit switch is an example of a contact-type sensor, as it detects the presence or absence of an object by making physical contact with it.
Which of the following is an example of a non-contact type sensor?
a. Load cell
b. Thermistor
c. Ultrasonic sensor
d. Strain gauge
Answer: c. Ultrasonic sensor
Explanation: An ultrasonic sensor is an example of a non-contact type sensor, as it uses sound waves to detect the presence or absence of an object without making physical contact with it.
What type of transducer is used to convert force into electrical signals?
a. LVDT
b. Potentiometer
c. Load cell
d. Thermocouple
Answer: c. Load cell
Explanation: A load cell is a type of transducer that converts force into electrical signals by utilizing strain gauges.
Which of the following is an example of an active sensor?
a. Thermocouple
b. RTD
c. Photoelectric sensor
d. LVDT
Answer: c. Photoelectric sensor
Explanation: A photoelectric sensor is an example of an active sensor, as it emits its own signal and detects the reflection or interruption of that signal.
Which of the following is an example of a passive sensor?
a. Ultrasonic sensor
b. Capacitive sensor
c. Thermistor
d. Piezoelectric sensor
Answer: c. Thermistor
Explanation: A thermistor is an example of a passive sensor, as it detects changes in temperature by changing its own electrical resistance.
What type of sensor is used to detect the presence or absence of an object by measuring changes in capacitance?
a. Photoelectric sensor
b. Inductive sensor
c. Capacitive sensor
d. Ultrasonic sensor
Answer: c. Capacitive sensor
Explanation: A capacitive sensor is used to detect the presence or absence of an object by measuring changes in capacitance caused by the object.
Which of the following is an example of a strain gauge?
a. LVDT
b. Load cell
c. Thermocouple
d. Potentiometer
Answer: b. Load cell
Explanation: A load cell is an example of a strain gauge, as it utilizes strain gauges to convert force into electrical signals.
What type of transducer is used to convert linear motion into electrical signals?
a. LVDT
b. Load cell
c. Thermocouple
d. Potentiometer
Answer: a. LVDT
Explanation: An LVDT (Linear Variable Differential Transformer) is a type of transducer that converts linear motion into electrical signals by utilizing a transformer.
What is the primary function of a thermocouple?
a. Detecting displacement
b. Measuring pressure
c. Measuring temperature
d. Detecting light
Answer: c. Measuring temperature
Explanation: A thermocouple is a type of temperature sensor that works by measuring the voltage difference between two different types of metal wires that are joined together at one end. The temperature at the joint affects the voltage produced, allowing for the measurement of temperature.
What is the principle of operation of a strain gauge?
a. Detecting pressure
b. Measuring temperature
c. Measuring the angle of rotation
d. Measuring deformation
Answer: d. Measuring deformation
Explanation: A strain gauge is a type of transducer that measures the amount of deformation in an object under stress or strain. It works by using a metal foil or wire that is attached to the surface of the object and stretches or compresses as the object deforms. This change in length is then measured as a change in resistance, which can be used to calculate the amount of strain or stress.
What is the primary function of a piezoelectric sensor?
a. Detecting pressure
b. Measuring temperature
c. Measuring the angle of rotation
d. Measuring deformation
Answer: a. Detecting pressure
Explanation: A piezoelectric sensor is a type of sensor that converts mechanical pressure into electrical charge. They are commonly used in applications such as accelerometers, pressure sensors, and vibration sensors.
What is the primary function of a load cell?
a. Measuring temperature
b. Detecting displacement
c. Measuring force
d. Detecting light
Answer: c. Measuring force
Explanation: A load cell is a type of transducer that measures the amount of force applied to it. They are commonly used in applications such as weighing scales, force measurement devices, and material testing equipment.
What is the primary function of a thermistor?
a. To measure temperature
b. To measure pressure
c. To measure flow rate
d. To measure humidity
Answer: a. To measure temperature
Explanation: A thermistor is a type of temperature sensor that works by measuring the resistance of a material in response to changes in temperature.
What is the principle of operation of a piezoelectric sensor?
a. Magnetic induction
b. Electrostatic induction
c. Electromagnetic induction
d. Mechanical deformation
Answer: d. Mechanical deformation
Explanation: Piezoelectric sensors work by converting mechanical deformation or pressure into an electrical charge, based on the piezoelectric effect of certain materials.
Which of the following is a type of proximity sensor?
a. Thermocouple
b. Hall effect sensor
c. Ultrasonic sensor
d. Load cell
Answer: c. Ultrasonic sensor
Explanation: Ultrasonic sensors are a type of proximity sensor that works by emitting sound waves and detecting the time it takes for them to reflect back, to determine the distance to an object.
What is the function of a load cell?
a. To measure temperature
b. To measure pressure
c. To measure weight
d. To measure humidity
Answer: c. To measure weight
Explanation: A load cell is a type of transducer that works by converting a mechanical force or weight into an electrical signal, typically used to measure the weight of an object.
Which of the following is a type of optical sensor?
a. Strain gauge
b. Accelerometer
c. Photodiode
d. Thermistor
Answer: c. Photodiode
Explanation: Photodiodes are a type of optical sensor that works by converting light into an electrical current, based on the photoelectric effect of certain materials. They are commonly used in applications such as light detection and optical communications.
What is the main difference between a sensor and a transducer?
A. Sensors convert physical quantity into electrical signals, while transducers convert electrical signals into a physical quantity
B. Sensors convert electrical signals into physical quantity, while transducers convert physical quantity into electrical signals
C. There is no difference between a sensor and a transducer
D. Sensors and transducers are both used to measure electrical signals
Answer: B
Explanation: Sensors are used to measure physical quantities such as temperature, pressure, and acceleration, and convert them into electrical signals. Transducers, on the other hand, convert electrical signals into physical quantities such as motion or sound.
Which type of sensor is used to measure humidity?
A. Accelerometer
B. Pressure sensor
C. Temperature sensor
D. Humidity sensor
Answer: D
Explanation: A humidity sensor is a type of sensor that measures the amount of water vapor in the air. It is commonly used in applications such as weather monitoring, HVAC systems, and food processing.
What is the operating principle of a piezoelectric sensor?
A. The sensor uses a magnetic field to generate an electrical signal
B. The sensor uses a piezoelectric crystal to generate an electrical signal in response to pressure or acceleration
C. The sensor measures the resistance of a material in response to an electrical signal
D. The sensor measures the change in capacitance of a material in response to an electrical signal
Answer: B
Explanation: A piezoelectric sensor uses a piezoelectric crystal to generate an electrical signal in response to pressure or acceleration. When the crystal is compressed or stretched, it generates a voltage across its surface, which can be measured as an electrical signal.
What is the main advantage of a fiber optic sensor over a traditional electrical sensor?
A. Fiber optic sensors can measure a wider range of physical quantities
B. Fiber optic sensors are more accurate and reliable
C. Fiber optic sensors are immune to electromagnetic interference
D. Fiber optic sensors are less expensive than traditional electrical sensors
Answer: C
Explanation: Fiber optic sensors use light to transmit signals, which makes them immune to electromagnetic interference. This makes them a good choice for applications where traditional electrical sensors may be affected by electromagnetic interference.
Which type of sensor is commonly used to detect the presence of an object in a manufacturing process?
A. Pressure sensor
B. Photoelectric sensor
C. Accelerometer
D. Temperature sensor
Answer: B
Explanation: A photoelectric sensor uses a light emitter and receiver to detect the presence or absence of an object. They are commonly used in manufacturing processes for tasks such as counting objects on a conveyor belt or detecting the position of parts during assembly.
What is the primary function of a transducer in an industrial automation system?
A. To measure physical quantities and convert them into electrical signals
B. To convert electrical signals into physical quantities
C. To store data and provide information to the control system
D. To regulate the flow of electrical current in the system
Answer: A
Explanation: The primary function of a transducer in an industrial automation system is to measure physical quantities such as temperature, pressure, or flow, and convert them into electrical signals that can be processed by the control system.
Which type of sensor is used to measure the rotation of a shaft?
A. Temperature sensor
B. Pressure sensor
C. Proximity sensor
D. Encoder
Answer: D
Explanation: An encoder is a type of sensor that measures the rotation of a shaft and converts it into an electrical signal. Encoders are commonly used in applications such as motor control, robotics, and CNC machines.
Which of the following is a type of vibration sensor?
a. Ultrasonic sensor
b. Strain gauge
c. Accelerometer
d. Pressure sensor
Answer: c
Explanation: An accelerometer is a type of vibration sensor that measures the acceleration or vibration of a system by measuring changes in velocity over time.
Which of the following is a type of resistive sensor?
a. Thermocouple
b. Strain gauge
c. Hall effect sensor
d. Optical sensor
Answer: b. Strain gauge
Explanation: A strain gauge is a type of resistive sensor that measures the deformation (strain) of an object under stress by changing its resistance.
Which of the following sensors is used to detect the presence or absence of an object?
a. Pressure sensor
b. Temperature sensor
c. Proximity sensor
d. Accelerometer
Answer: c. Proximity sensor
Explanation: A proximity sensor is a sensor that detects the presence or absence of an object without physical contact.
Which of the following is a type of capacitive transducer?
a. Piezoelectric transducer
b. LVDT
c. Thermistor
d. Variable capacitance transducer
Answer: d. Variable capacitance transducer
Explanation: A variable capacitance transducer is a type of capacitive transducer that measures the displacement or position of an object by changing the capacitance between two plates.
Which of the following is a type of optical sensor?
a. Thermocouple
b. Strain gauge
c. Hall effect sensor
d. Photoelectric sensor
Answer: d. Photoelectric sensor
Explanation: A photoelectric sensor is a type of optical sensor that uses light to detect the presence or absence of an object.
Which of the following is a type of inductive sensor?
a. Thermocouple
b. Strain gauge
c. LVDT
d. Hall effect sensor
Answer: c. LVDT
Explanation: An LVDT (Linear Variable Differential Transformer) is a type of inductive sensor that measures linear displacement or position.
Which of the following is a type of digital sensor?
a. Thermistor
b. Thermocouple
c. Hall effect sensor
d. Digital potentiometer
Answer: d. Digital potentiometer
Explanation: A digital potentiometer is a type of digital sensor that measures resistance in digital form.
Which of the following is a type of piezoelectric transducer?
a. Load cell
b. Strain gauge
c. Accelerometer
d. Thermocouple
Answer: c. Accelerometer
Explanation: An accelerometer is a type of piezoelectric transducer that measures acceleration.
Which of the following sensors is used to measure the amount of light in a particular area?
a. Thermocouple
b. LDR (Light Dependent Resistor)
c. Hall effect sensor
d. Strain gauge
Answer: b. LDR (Light Dependent Resistor)
Explanation: An LDR is a sensor that measures the amount of light in a particular area by changing its resistance.
Which of the following is a type of magnetic sensor?
a. Thermistor
b. Strain gauge
c. Hall effect sensor
d. LVDT
Answer: c. Hall effect sensor
Explanation: A Hall effect sensor is a type of magnetic sensor that measures the magnetic field strength.
Which of the following is a type of pressure sensor?
a. LVDT
b. Piezoelectric transducer
c. Thermistor
d. Strain gauge
Answer: b. Piezoelectric transducer
Explanation: A piezoelectric transducer is a type of pressure sensor that measures pressure by converting it into an electrical charge.
What is the principle of operation of a capacitive transducer?
A. Change in resistance
B. Change in capacitance
C. Change in inductance
D. Change in voltage
Answer: B
Explanation: A capacitive transducer works on the principle of change in capacitance due to a change in the physical quantity to be measured. When the distance between the plates of a capacitor changes, the capacitance of the capacitor changes accordingly. This change in capacitance is then converted into an electrical signal by the transducer.
What is the purpose of calibrating a sensor or transducer?
A. To adjust the signal output
B. To repair any damages
C. To change the operating range
D. To improve the durability
Answer: A
Explanation: Calibrating a sensor or transducer involves adjusting its output signal to match a known standard. This ensures that the sensor is accurately measuring the physical parameter it is designed to detect.
Which of the following methods is used to calibrate a temperature sensor?
A. Using a thermometer
B. Using a voltmeter
C. Using a pressure gauge
D. Using a flowmeter
Answer: A
Explanation: To calibrate a temperature sensor, a thermometer is typically used to provide a known reference temperature. The output of the temperature sensor is then adjusted to match the reference temperature.
What is the purpose of testing a sensor or transducer?
A. To ensure that it is properly calibrated
B. To verify that it is working correctly
C. To adjust its signal output
D. To improve its durability
Answer: B
Explanation: Testing a sensor or transducer involves verifying that it is operating correctly and producing accurate measurements. This is important to ensure that the sensor can be relied upon to provide accurate data.
Which of the following methods is used to test a pressure transducer?
A. Using a pressure gauge
B. Using a thermometer
C. Using a flowmeter
D. Using a voltmeter
Answer: A
Explanation: To test a pressure transducer, a pressure gauge is typically used to provide a known reference pressure. The output of the transducer is then compared to the reference pressure to ensure that it is producing accurate measurements.
What is the purpose of load cell calibration?
A. To adjust the load cell’s signal output
B. To repair any damages
C. To change the load cell’s operating range
D. To improve the load cell’s durability
Answer: A
Explanation: Load cell calibration involves adjusting the load cell’s output signal to match a known standard. This ensures that the load cell is accurately measuring the weight or force it is designed to detect.
Which of the following calibration methods involves comparing the sensor’s output with a known standard?
A. Dynamic calibration
B. Static calibration
C. Absolute calibration
D. Relative calibration
Answer: B. Static calibration
Explanation: Static calibration involves comparing the output of a sensor or transducer with a known standard while it is in a stationary state. It is a simple and widely used calibration method for most sensors and transducers.
The hysteresis error in a sensor’s calibration curve is due to:
A. A time delay between input and output
B. A non-linear response to input
C. A drift in the sensor’s output over time
D. A difference in the sensor’s response when increasing or decreasing the input
Answer: D. A difference in the sensor’s response when increasing or decreasing the input
Explanation: Hysteresis error is a type of non-linearity error in a sensor’s calibration curve that occurs due to a difference in the sensor’s output when increasing or decreasing the input. It is caused by the sensor’s internal mechanics, such as friction or hysteresis in materials.
Which of the following is a typical method used for testing the linearity of a sensor or transducer?
A. Zero and span testing
B. Dynamic testing
C. Relative testing
D. Sensitivity testing
Answer: A. Zero and span testing
Explanation: Zero and span testing is a common method used for testing the linearity of a sensor or transducer. It involves testing the output of the sensor at the zero point and at a known span or range of inputs to determine if the output is linear.
The process of adjusting a sensor’s output to match a known standard is called:
A. Testing
B. Calibration
C. Sensitivity analysis
D. Linearity testing
Answer: B. Calibration
Explanation: Calibration is the process of adjusting a sensor’s output to match a known standard. This is typically done using specialized equipment and software that can adjust the sensor’s internal circuitry to produce more accurate output.
Which of the following factors can affect the accuracy of a sensor’s calibration?
A. Environmental factors, such as temperature and humidity
B. Mechanical factors, such as shock and vibration
C. Electrical factors, such as electromagnetic interference
D. All of the above
Answer: D. All of the above
Explanation: Many different factors can affect the accuracy of a sensor’s calibration, including environmental factors like temperature and humidity, mechanical factors like shock and vibration, and electrical factors like electromagnetic interference. To ensure accurate calibration, it is important to take these factors into account and use appropriate testing methods.
What is a likely cause of erratic readings from a temperature sensor?
A. The sensor is too far from the source of heat
B. The sensor wiring is loose or damaged
C. The sensor is damaged or faulty
D. The sensor is too close to the source of heat
Answer: D. The sensor is too close to the source of heat. This can cause the sensor to register the heat of the sensor itself rather than the temperature of the target object.
What could cause a pressure sensor to read lower than expected?
A. The pressure source is too high
B. The sensor is not properly calibrated
C. The sensor is damaged or faulty
D. The pressure source is too low
Answer: D. The pressure source is too low. If the pressure source is lower than the sensor range, the sensor may not be able to accurately read the pressure.
What is a possible cause of a flow sensor showing no flow despite fluid flowing?
A. The sensor is dirty or clogged
B. The sensor is not properly calibrated
C. The sensor is damaged or faulty
D. The fluid is flowing too quickly
Answer: A. The sensor is dirty or clogged. Dirt, debris, or other contaminants can clog the sensor and prevent it from registering any flow.
What might be a cause of a proximity sensor failing to detect objects?
A. The sensor is too sensitive
B. The sensor is too far away from objects
C. The sensor is not powered properly
D. The sensor is damaged or faulty
Answer: D. The sensor is damaged or faulty. Proximity sensors rely on electronic components to detect objects, and if these components are damaged, the sensor will not function properly.
What is a likely cause of a rotary encoder giving inconsistent readings?
A. The encoder is not properly installed
B. The encoder is dirty or damaged
C. The encoder is not properly calibrated
D. The encoder is too far from the target object
Answer: B. The encoder is dirty or damaged. Any debris or damage to the encoder can cause it to give inconsistent readings, as it may not be able to accurately track the position or rotation of the target object.
What are some common types of temperature sensors used in industrial applications?
a. Thermocouples
b. RTDs (Resistance Temperature Detectors)
c. Thermistors
d. All of the above
Answer: d. All of the above
Explanation: In industrial applications, thermocouples, RTDs, and thermistors are the most commonly used temperature sensors. Thermocouples are rugged and can measure a wide range of temperatures, while RTDs are highly accurate and stable over time. Thermistors are inexpensive and sensitive to small changes in temperature.
What is a strain gauge sensor?
a. A sensor used to measure the weight of an object
b. A sensor used to measure the strain or deformation of an object
c. A sensor used to measure the flow rate of a liquid
d. A sensor used to measure the temperature of an object
Answer: b. A sensor used to measure the strain or deformation of an object
Explanation: A strain gauge sensor is a type of sensor used to measure the strain or deformation of an object. It works by using a wire or foil that is attached to the object being measured, which deforms along with the object. As the wire or foil deforms, its resistance changes, allowing the sensor to measure the amount of strain on the object.
What is a load cell?
a. A device used to measure the weight of an object
b. A device used to measure the temperature of an object
c. A device used to measure the flow rate of a liquid
d. A device used to measure the pressure of a gas
Answer: a. A device used to measure the weight of an object
Explanation: A load cell is a type of sensor used to measure the weight or force applied to an object. It works by measuring the deformation of a metal spring or other mechanical component when a force is applied to it. This deformation can be measured and converted into an electrical signal that can be read by a computer or other electronic device.
What is an accelerometer?
a. A sensor used to measure the weight of an object
b. A sensor used to measure the strain or deformation of an object
c. A sensor used to measure the flow rate of a liquid
d. A sensor used to measure acceleration or vibration
Answer: d. A sensor used to measure acceleration or vibration
Explanation: An accelerometer is a type of sensor used to measure acceleration or vibration. It works by using a mass that is suspended by a spring or other mechanical component. When the accelerometer is subjected to acceleration or vibration, the mass moves, and its displacement can be measured and converted into an electrical signal that can be read by a computer or other electronic device.
What is a pressure transducer?
a. A sensor used to measure the weight of an object
b. A sensor used to measure the temperature of an object
c. A sensor used to measure the flow rate of a liquid
d. A sensor used to measure the pressure of a gas or liquid
Answer: d. A sensor used to measure the pressure of a gas or liquid
Explanation: A pressure transducer is a type of sensor used to measure the pressure of a gas or liquid. It works by converting the pressure into an electrical signal, which can be read by a computer or other electronic device. Pressure transducers are commonly used in industrial applications such as monitoring the pressure of gases or liquids in pipes and tanks.
What is a proximity sensor?
a. A sensor used to measure the weight of an object
b. A sensor used to measure the temperature of an object
c. A sensor used to measure the flow rate of a liquid
d. A sensor used to detect the presence of nearby objects
Answer: d. A proximity sensor is a sensor used to detect the presence of nearby objects.
Explanation: Proximity sensors are devices that can detect the presence or absence of an object without making physical contact with it. They work by emitting a field of energy (such as an electromagnetic field or sound waves) and then detecting changes in that field caused by the presence of an object. These sensors are commonly used in industrial automation, robotics, and consumer electronics, among other applications.
What is a piezoelectric sensor?
a. A sensor that measures temperature
b. A sensor that measures pressure
c. A sensor that measures humidity
d. A sensor that measures distance
Answer: b. A sensor that measures pressure
Explanation: A piezoelectric sensor is a type of pressure sensor that uses a piezoelectric crystal to measure changes in pressure.
Which of the following is an example of a passive transducer?
a. Strain gauge
b. Thermocouple
c. LVDT
d. Photoelectric sensor
Answer: a. Strain gauge
Explanation: Passive transducers do not require an external power source and convert physical quantity into an electrical signal. Strain gauges are one example of passive transducers.
Which of the following is a contact-type temperature sensor?
a. Thermocouple
b. RTD
c. Thermistor
d. Infrared sensor
Answer: a. Thermocouple
Explanation: Thermocouples are temperature sensors that work by measuring the voltage produced by two dissimilar metals in contact with each other. They are commonly used in high-temperature applications.
What is a load cell used for?
a. To measure temperature
b. To measure pressure
c. To measure humidity
d. To measure force
Answer: d. To measure force
Explanation: A load cell is a type of transducer used to measure force or weight. They are commonly used in industrial applications to measure the force applied to a structure or component.
Which of the following is a disadvantage of using a thermistor as a temperature sensor?
a. They are expensive
b. They are difficult to calibrate
c. They have a limited temperature range
d. They are not very accurate
Answer: c. They have a limited temperature range
Explanation: Thermistors are temperature sensors that work by measuring changes in resistance as temperature changes. However, they have a limited temperature range and may not be suitable for use in high-temperature applications.
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