Klu Certificate Course Automotive Electronics & Iot

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Quizzes Created: 2 | Total Attempts: 793

Questions: 60 | Attempts: 588 | Updated: Mar 21, 2023

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Klu Certificate Course Automotive Electronics & Iot - Quiz

Questions and Answers

1.

Capacitor provides ______ Degree Phase Shift.
- A.
  
  120
- B.
  
  90
- C.
  
  45
- D.
  
  180
Correct Answer
A. 120

Explanation
A capacitor provides a 120 degree phase shift. This is because a capacitor stores and releases electrical energy in the form of an electric field. When an AC voltage is applied to a capacitor, it charges and discharges in a cyclical manner. The phase shift occurs because the voltage across the capacitor leads the current through it by 90 degrees. Therefore, the capacitor provides a phase shift of 120 degrees.

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2.

In Passive Cell Balancing ______ is used.
- A.
  
  R- Resistor
- B.
  
  C- Capacitor
- C.
  
  L - Inductor
Correct Answer
A. R- Resistor

Explanation
Passive cell balancing is a technique used to equalize the charge levels of individual cells in a battery pack. In this method, resistors are used to dissipate excess charge from cells that have a higher charge level. By connecting a resistor in parallel with the cell, the excess charge is converted into heat, allowing the cell to discharge and reach a balanced state with the other cells. Therefore, the correct answer is R- Resistor.

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3.

C-rate of a Lithium-Ion cell is typically the current needed to Discharge a fully charged cell in ______.
- A.
  
  One Hour
- B.
  
  One Minute
- C.
  
  One Second
- D.
  
  One Day
Correct Answer
A. One Hour

Explanation
The C-rate of a Lithium-Ion cell refers to the rate at which the cell can discharge its fully charged capacity. A C-rate of one hour means that the cell can discharge its fully charged capacity over a period of one hour. This indicates the discharge current needed to fully deplete the cell's charge in one hour.

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4.

Galvanic Cell have _____ and Copper Electrode
- A.
  
  Copper
- B.
  
  Zinc
- C.
  
  Lead
- D.
  
  Galava
Correct Answer
B. Zinc

Explanation
A galvanic cell consists of two electrodes, an anode and a cathode, which are made of different materials. In this case, the correct answer is Zinc because it is one of the possible materials that can be used as an electrode in a galvanic cell. Copper is not the correct answer as it is mentioned in the question itself as one of the options, and lead and galava are not commonly used electrode materials in galvanic cells.

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5.

______is best storage device.
- A.
  
  Battery
- B.
  
  Capacitor
- C.
  
  Super Capacitor
- D.
  
  Choke
Correct Answer
A. Battery

Explanation
A battery is considered the best storage device because it can store electrical energy and release it as needed. Batteries are portable, reliable, and have a long lifespan compared to other storage devices like capacitors or chokes. They are commonly used in various applications such as powering electronic devices, vehicles, and backup power systems.

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6.

Temp Increases Battery Capacity But Battery Life Decreases
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
When the temperature increases, the battery's capacity to store and deliver energy also increases. However, this comes at the cost of reducing the battery's overall lifespan. High temperatures can cause chemical reactions to occur at a faster rate, leading to the degradation of the battery's components and reducing its longevity. Therefore, while a higher temperature may temporarily increase the battery's capacity, it will ultimately decrease its overall lifespan.

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7.

Computer calculates numbers in ____ mode
- A.
  
  Binary
- B.
  
  Octal
- C.
  
  Bilateral
- D.
  
  Swiggy
Correct Answer
A. Binary

Explanation
Computers calculate numbers in binary mode because binary is the fundamental language that computers use to represent and process data. Binary is a base-2 numbering system, meaning it only uses two digits, 0 and 1, to represent all numbers and characters. This is because computers use electronic switches that can be either on or off, representing 1 or 0 respectively. By using binary, computers can perform calculations and manipulate data using electronic circuits and logic gates, making it the most efficient and natural mode for computer calculations.

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8.

The production of a potential difference across an electrical conductor when a magnetic field is applied in a direction perpendicular to that of the flow of current is called _______effect.
- A.
  
  Hall
- B.
  
  Flux
- C.
  
  Tesla
- D.
  
  Zomato
Correct Answer
A. Hall

Explanation
The production of a potential difference across an electrical conductor when a magnetic field is applied in a direction perpendicular to that of the flow of current is called the Hall effect.

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9.

Find odd one out.
- A.
  
  Sense
- B.
  
  Think
- C.
  
  Act
- D.
  
  Peep
Correct Answer
D. Peep

Explanation
The words "Sense," "Think," "Act," are all verbs that describe actions or mental processes. However, "Peep" is a noun that refers to a quick or secretive glance. Therefore, "Peep" is the odd one out.

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10.

Select the smallest memory type
- A.
  
  Terabyte
- B.
  
  Kilobyte
- C.
  
  Gigabyte
- D.
  
  Megabyte
Correct Answer
B. Kilobyte

Explanation
A kilobyte is the smallest memory type among the options given. It represents a unit of digital information that is equal to 1,024 bytes. In comparison, a megabyte is equal to 1,024 kilobytes, a gigabyte is equal to 1,024 megabytes, and a terabyte is equal to 1,024 gigabytes. Therefore, the kilobyte is the smallest measurement of memory capacity among these options.

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11.

Change in output of sensor with change in input is ____________
- A.
  
  Threashold
- B.
  
  Slew rate
- C.
  
  Sensitivity
Correct Answer
C. Sensitivity

Explanation
Sensitivity refers to the degree of response or change in the output of a sensor with a corresponding change in the input. It measures the ability of the sensor to detect and respond to variations in the input signal. A higher sensitivity means that even small changes in the input will result in a significant change in the output, while a lower sensitivity indicates that larger changes in the input are required to produce a noticeable change in the output. Therefore, sensitivity is the most appropriate term to describe the change in output of a sensor with a change in input.

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12.

Smalest change which a sensor can detect is ____________
- A.
  
  Resolution
- B.
  
  Accuracy
- C.
  
  Precision
- D.
  
  Scale
Correct Answer
A. Resolution

Explanation
Resolution refers to the smallest change or increment that a sensor can detect. It is a measure of the sensor's ability to distinguish between small changes in the input signal. A sensor with high resolution can detect smaller changes, while a sensor with low resolution may only be able to detect larger changes. Accuracy, precision, and scale are not directly related to the smallest detectable change of a sensor.

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13.

Sensor is a type of transducer
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
A sensor is indeed a type of transducer. Transducers are devices that convert one form of energy into another, and sensors specifically convert physical or environmental variables into electrical signals. They are commonly used in various applications such as temperature measurement, pressure sensing, and motion detection. Therefore, it is correct to say that a sensor is a type of transducer.

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14.

Which of the following is not an analog sensor?
- A.
  
  Potentiometer
- B.
  
  Force Sensing Resistors
- C.
  
  Accelermeters
- D.
  
  NOTA
Correct Answer
D. NOTA

Explanation
The correct answer is NOTA because NOTA stands for None of the Above, which means it does not represent any specific type of sensor. Potentiometer, Force Sensing Resistors, and Accelerometers are all examples of analog sensors as they measure physical quantities such as position, force, and acceleration and provide a continuous range of output values.

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15.

A/D conversion is not needed in smart sensor.
- A.
  
  True
- B.
  
  Flase
Correct Answer
B. Flase

Explanation
The statement "A/D conversion is not needed in smart sensor" is incorrect. A/D conversion, which stands for analog-to-digital conversion, is a process that converts analog signals into digital signals. Smart sensors, like any other sensors, often measure analog signals from the physical world and need to convert them into digital signals for processing and analysis. Therefore, A/D conversion is necessary in smart sensors.

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16.

Which of the following is correct for microprocessor Intel 8085?
- A.
  
  6 bit microprocessor
- B.
  
  16 bit microprocessor
- C.
  
  8 bit microprocessor
- D.
  
  14 bit microprocessor
Correct Answer
C. 8 bit microprocessor

Explanation
The correct answer is 8 bit microprocessor. The Intel 8085 is an 8-bit microprocessor, which means that it can process data in 8-bit chunks at a time. This means that it can handle data and instructions that are 8 bits wide.

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17.

Which proximity sensor detects metal objects?
- A.
  
  Capacitive Proximity Sensor
- B.
  
  Magnetic Proximity Sensor
- C.
  
  Ultrasonic Proximity Sensor
- D.
  
  Inductive Proximity Sensor
Correct Answer
D. Inductive Proximity Sensor

Explanation
The inductive proximity sensor detects metal objects because it works on the principle of electromagnetic induction. When a metal object comes close to the sensor, it disrupts the electromagnetic field generated by the sensor, causing a change in the sensor's output. This change is then used to detect the presence of the metal object.

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18.

Which proximity sensors are used in automotive?
- A.
  
  Inductive Proximity Sensor
- B.
  
  Capacitive Proximity Sensor
- C.
  
  Magnetic Proximity Sensor
- D.
  
  Ultrasonic Proximity Sensor
Correct Answer
D. Ultrasonic Proximity Sensor

Explanation
Ultrasonic proximity sensors are commonly used in the automotive industry because they provide accurate and reliable detection of objects at a close range. These sensors emit high-frequency sound waves and measure the time it takes for the waves to bounce back after hitting an object. This information is then used to determine the distance between the sensor and the object. Ultrasonic sensors are ideal for applications such as parking assistance, object detection, and collision avoidance systems in vehicles.

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19.

Current requirement of a LED is ______
- A.
  
  1.7 mA
- B.
  
  2.5 mA
- C.
  
  Between 3 to 35 mA
- D.
  
  25 mA
Correct Answer
C. Between 3 to 35 mA

Explanation
The correct answer is "Between 3 to 35 mA" because LEDs typically require a current within this range to operate efficiently. Operating the LED at a current below 3 mA may result in dim or no illumination, while exceeding 35 mA can lead to overheating and damage to the LED. Therefore, it is necessary to provide a current between 3 to 35 mA to ensure proper functioning and longevity of the LED.

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20.

. ________ detects metals but along with it can also detect resins, liquids.
- A.
  
  Inductive proximity
- B.
  
  Capacitive Proximity
- C.
  
  Magnetic Proximity
- D.
  
  Parallel Proximity
Correct Answer
B. Capacitive Proximity

Explanation
Capacitive proximity sensors can detect metals, as well as other materials such as resins and liquids, because they work based on changes in capacitance. When an object comes close to the sensor, it causes a change in the capacitance, which is then detected by the sensor. This makes capacitive proximity sensors versatile and suitable for detecting a wide range of materials beyond just metals.

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21.

What is the microcontroller used in Arduino UNO?
- A.
  
  ATmega328p
- B.
  
  ATmega2560
- C.
  
  ATmega32114
- D.
  
  AT91SAM3x8E
Correct Answer
A. ATmega328p

Explanation
The correct answer is ATmega328p. The Arduino UNO uses the ATmega328p microcontroller. This microcontroller is widely used in many Arduino boards due to its low cost, low power consumption, and compatibility with the Arduino IDE. It has 32KB of flash memory, 2KB of SRAM, and 1KB of EEPROM, making it suitable for a wide range of projects.

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22.

Do Arduino provides IDE Environment?
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Yes, Arduino does provide an IDE (Integrated Development Environment) environment. The Arduino IDE is a software program that allows users to write, compile, and upload code to Arduino boards. It provides a user-friendly interface and a set of libraries that simplify the process of programming Arduino boards. With the Arduino IDE, users can easily create and upload their own custom programs to control various electronic devices and projects.

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23.

Which is the software or a programming language used for controlling of Arduino?
- A.
  
  Assembly Language
- B.
  
  C Languages
- C.
  
  JAVA
- D.
  
  Any Language
Correct Answer
D. Any Language

Explanation
Arduino can be controlled using any programming language because it has its own software, called the Arduino IDE (Integrated Development Environment), which allows users to write and upload code to the Arduino board. The Arduino IDE supports a simplified version of the C++ programming language. However, it is also possible to use other programming languages like Python, Java, or even assembly language to control Arduino by using appropriate libraries or frameworks. Therefore, the correct answer is "Any Language."

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24.

How many digital pins are there on the UNO board?
- A.
  
  14
- B.
  
  12
- C.
  
  16
- D.
  
  20
Correct Answer
A. 14

Explanation
The correct answer is 14. The UNO board has a total of 14 digital pins. These pins can be used for input or output purposes, allowing the user to connect various sensors, actuators, or other electronic components to the board. Digital pins can be controlled by writing a HIGH or LOW signal to them, making them a crucial component for any project built on the UNO board.

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25.

Electric motor protection has which sensor?
- A.
  
  Pressure sensor
- B.
  
  Touch sensor
- C.
  
  Humidity sensor
- D.
  
  Temperature sensor
Correct Answer
D. Temperature sensor

Explanation
Electric motors generate heat during operation, and excessive heat can damage the motor or surrounding components. Therefore, it is important to have a temperature sensor to monitor the motor's temperature and prevent overheating. The temperature sensor can detect when the motor reaches a certain temperature threshold and trigger protective measures such as shutting down the motor or activating cooling systems. This helps to ensure the motor's longevity and prevent any potential hazards caused by overheating.

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26.

A ________ is thermally sensitive resistor that exhibits a large change in resistance.
- A.
  
  Thermistor
- B.
  
  Resistance Thermometer
- C.
  
  Thermo couple
- D.
  
  Semiconductor based sensor
Correct Answer
A. Thermistor

Explanation
A thermistor is a thermally sensitive resistor that exhibits a large change in resistance. This means that the resistance of a thermistor varies significantly with changes in temperature. This property makes thermistors useful in temperature sensing and control applications.

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27.

Which type of temperature sensor is placed in Integrated Circuits?
- A.
  
  Thermistor
- B.
  
  Resistance Thermometer
- C.
  
  Thermocouple
- D.
  
  Semiconductor based sensor
Correct Answer
D. Semiconductor based sensor

Explanation
A semiconductor based sensor is placed in Integrated Circuits as a temperature sensor. Integrated Circuits are made up of tiny electronic components that are placed on a semiconductor material. Since the temperature of the Integrated Circuit can affect its performance and reliability, a temperature sensor is integrated into the circuit to monitor and regulate the temperature. This type of sensor is commonly used in electronic devices and systems to ensure optimal operating conditions and prevent overheating.

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28.

Global Sensor Network is built for _________
- A.
  
  Reducing cost and time for development
- B.
  
  Reducing cost and increasing time for development
- C.
  
  Increasing cost and increasing time for development
- D.
  
  Increasing cost and decreasing time for development
Correct Answer
A. Reducing cost and time for development

Explanation
The Global Sensor Network is designed to reduce both the cost and time required for development. This means that the network aims to make the development process more efficient and cost-effective. By reducing costs, it becomes more accessible for organizations and individuals to build and implement sensor networks. Additionally, by reducing the time required for development, the network can be deployed and utilized more quickly, allowing for faster data collection and analysis.

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29.

___________ is a community that is working together to establish an IoT architecture.
- A.
  
  Eclipse IoT
- B.
  
  Red Hat
Correct Answer
A. Eclipse IoT

Explanation
Eclipse IoT is a community that is actively collaborating to develop and implement an Internet of Things (IoT) architecture. They work together to create open-source technologies, frameworks, and tools that enable the seamless integration and management of IoT devices and data. This community aims to foster innovation and provide a platform for developers and organizations to build scalable and interoperable IoT solutions.

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30.

How many types of voice communications are there in IoT environment?
- A.
  
  2 types
- B.
  
  4 types
- C.
  
  3 types
- D.
  
  5 types
Correct Answer
C. 3 types

Explanation
In an IoT environment, there are three types of voice communications. These include voice over IP (VoIP), voice recognition, and voice synthesis. VoIP allows for voice communication over the internet, while voice recognition enables devices to understand and respond to spoken commands. Voice synthesis, on the other hand, involves the generation of artificial speech by machines. Therefore, the correct answer is 3 types.

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31.

Figure represents _______ sensor.
- A.
  
  Temperature
- B.
  
  Pressure
- C.
  
  Infrared
- D.
  
  Proximity
Correct Answer
A. Temperature

Explanation
The figure represents a temperature sensor because it is commonly used to measure and detect changes in temperature. Temperature sensors are designed to convert temperature into an electrical signal, allowing for temperature monitoring and control in various applications such as weather monitoring, HVAC systems, and industrial processes.

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32.

Figure represents ___________ sensor.
- A.
  
  IR
- B.
  
  Black & White
- C.
  
  Blue Sensor
Correct Answer
A. IR

Explanation
The figure represents an IR sensor.

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33.

The following is not a static performance parameter to be looked into before selecting a parameter.
- A.
  
  Range
- B.
  
  Deflection
- C.
  
  Stability
- D.
  
  Error
Correct Answer
B. Deflection

Explanation
Deflection is not a static performance parameter because it refers to the displacement or bending of a structure under applied loads. Unlike range, stability, and error, which are measurable and quantifiable parameters, deflection is a dynamic characteristic that depends on external forces and the material properties of the structure. Therefore, it cannot be used as a criterion for selecting a parameter.

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34.

The following main dynamic characteristic(s) is usually considered in Mechatronics application of sensors.
- A.
  
  Response time
- B.
  
  Rise time
- C.
  
  Time constant
- D.
  
  All of the above
Correct Answer
D. All of the above

Explanation
In Mechatronics applications of sensors, the main dynamic characteristics that are typically considered are response time, rise time, and time constant. Response time refers to the time it takes for the sensor to react to a change in the measured quantity. Rise time is the time it takes for the sensor output to rise from a low value to a high value. Time constant is the time it takes for the sensor output to reach a steady-state value after a change in the measured quantity. Therefore, all of these characteristics are important in Mechatronics applications of sensors.

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35.

Graph represents response for __________ .
- A.
  
  Voltameter
- B.
  
  Thermocouple
- C.
  
  Tempameter
- D.
  
  Hottameter
Correct Answer
B. Thermocouple

Explanation
The graph represents the response for a thermocouple. A thermocouple is a device that measures temperature by utilizing the principle of the Seebeck effect, which generates a voltage when there is a temperature difference between two different metals. The graph likely shows the relationship between the temperature being measured and the corresponding voltage generated by the thermocouple.

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36.

Figure represents _____ .
- A.
  
  Smoke Sensor
- B.
  
  Sound Sensor
- C.
  
  Microphone
Correct Answer
A. Smoke Sensor

Explanation
The figure represents a smoke sensor because it is commonly used to detect smoke particles in the air. Smoke sensors are designed to trigger an alarm or alert system when smoke is detected, making them essential in fire safety systems.

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37.

A light dependent resistor is made up of
- A.
  
  Low resistance semiconductor
- B.
  
  Low resistance metal
- C.
  
  High resistance semiconductor
- D.
  
  High resistance metal
Correct Answer
C. High resistance semiconductor

Explanation
A light dependent resistor is made up of a high resistance semiconductor because it is designed to have a high resistance in the absence of light. When light falls on the semiconductor material, the resistance decreases, allowing current to flow more easily. This property makes it useful for applications such as light sensors or in circuits where the resistance needs to vary based on the intensity of light.

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38.

When temperature rises, resistance of negative temperature coefficient thermistor
- A.
  
  Increases
- B.
  
  Decreases
- C.
  
  Zero
- D.
  
  Infinity
Correct Answer
B. Decreases

Explanation
When temperature rises, the resistance of a negative temperature coefficient (NTC) thermistor decreases. This is because NTC thermistors are made of semiconductor materials that exhibit a decrease in resistance as temperature increases. As the temperature rises, the increased thermal energy causes more electrons to be released, increasing the conductivity of the material and resulting in a decrease in resistance.

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39.

Strain gauge is a
- A.
  
  Active device and converts mechanical displacement into a change of resistance
- B.
  
  Passive device and converts electrical displacement into a change of resistance
- C.
  
  Passive device and converts mechanical displacement into a change of resistance
- D.
  
  Active device and converts electrical displacement into a change of resistance
Correct Answer
C. Passive device and converts mechanical displacement into a change of resistance

Explanation
A strain gauge is a passive device that converts mechanical displacement into a change of resistance. It does not require an external power source to function and relies solely on the mechanical deformation of its structure to produce a change in resistance. This change in resistance can then be measured and used to determine the amount of strain or deformation experienced by the object to which the strain gauge is attached.

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40.

The linear variable differential transformer transducer is
- A.
  
  Inductive transducer
- B.
  
  Non-inductive transducer
- C.
  
  Capacitive transducer
- D.
  
  Resistive transducer
Correct Answer
A. Inductive transducer

Explanation
The linear variable differential transformer (LVDT) is an inductive transducer. It operates based on the principle of electromagnetic induction. The LVDT consists of a primary coil and two secondary coils wound on a cylindrical core. When an AC voltage is applied to the primary coil, it induces a voltage in the secondary coils. The magnitude of the induced voltage in the secondary coils is directly proportional to the displacement of the core. Therefore, the LVDT is used to measure linear displacement by converting it into an electrical signal through inductive coupling.

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41.

With the increase in the intensity of light, the resistance of a photovoltaic cell
- A.
  
  Increases
- B.
  
  Decreases
- C.
  
  Remains same
- D.
  
  None of these
Correct Answer
B. Decreases

Explanation
As the intensity of light increases, the resistance of a photovoltaic cell decreases. This is because the photovoltaic cell converts light energy into electrical energy. When the intensity of light is high, more photons are absorbed by the cell, leading to a greater number of electron-hole pairs being generated. This increases the conductivity of the cell, resulting in a decrease in resistance. Therefore, the resistance of a photovoltaic cell decreases with an increase in light intensity.

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42.

The ability to give same output reading when same input value is applied repeatedly is known as
- A.
  
  Stability
- B.
  
  Repeatability
- C.
  
  Accuracy
- D.
  
  Sensitivity
Correct Answer
B. Repeatability

Explanation
Repeatability refers to the ability of a system or process to produce the same output when the same input value is applied repeatedly. In other words, it ensures consistency and reliability in the results. This characteristic is important in various fields, such as scientific experiments, manufacturing processes, and data analysis, as it allows for the replication of results and the identification of any variations or errors.

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43.

Absolute encoders require data.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Absolute encoders do not require data. Unlike incremental encoders, which require a reference point to determine position, absolute encoders provide a unique digital code for each position in a rotation. This means that even without any external data or reference point, absolute encoders can accurately determine position. Therefore, the statement that absolute encoders require data is false.

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44.

Which of the following is correct for tactile sensors
- A.
  
  Touch sensitive
- B.
  
  Pressure sensitive
- C.
  
  Input voltage sensitive
- D.
  
  Humidity sensitive
Correct Answer
A. Touch sensitive

Explanation
Tactile sensors are designed to detect and measure physical touch or pressure. They are used to provide feedback or input based on touch interactions. Therefore, the correct option for tactile sensors is "Touch sensitive." This means that the sensors are able to sense and respond to touch or contact with an object.

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45.

It is the time required to come to an output value within the specified error level.
- A.
  
  None of the above
- B.
  
  Response Time
- C.
  
  Rise Time
- D.
  
  Settling time
Correct Answer
D. Settling time

Explanation
Settling time refers to the time it takes for an output value to stabilize within a specified error level. It is the duration required for the output to settle down and reach a steady state after a change or disturbance. This is different from response time, which refers to the time it takes for a system to respond to a stimulus or input. Rise time, on the other hand, specifically refers to the time it takes for a signal or waveform to transition from a low level to a high level. Therefore, settling time is the most appropriate answer in this context.

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46.

Which of the following is used in photo conductive cell?
- A.
  
  Selenium
- B.
  
  Quartz
- C.
  
  Rochelle salt
Correct Answer
A. Selenium

Explanation
Selenium is used in photoconductive cells. Photoconductive cells are devices that change their electrical conductivity when exposed to light. Selenium is a semiconductor material that exhibits this property, making it suitable for use in photoconductive cells. When light falls on selenium, it excites its electrons, causing an increase in electrical conductivity. This property allows selenium to be used in light sensors, solar cells, and other light-sensitive applications. Quartz and Rochelle salt do not possess the same photoconductive properties as selenium, making them unsuitable for use in photoconductive cells.

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47.

Capacitive transducer are used for?
- A.
  
  Static measurement
- B.
  
  Dynamic measurement
- C.
  
  Transient measurement
Correct Answer
B. Dynamic measurement

Explanation
Capacitive transducers are used for dynamic measurement because they can accurately measure changes in capacitance caused by varying physical quantities such as displacement, pressure, or force. These transducers are sensitive to small changes in capacitance and can provide real-time measurements of dynamic events. They are commonly used in applications such as vibration analysis, motion sensing, and pressure monitoring, where the measurement parameters are continuously changing.

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48.

What is the principle of operation of LVDT?
- A.
  
  Mutual inductance
- B.
  
  Self-inductance
- C.
  
  Permanence
- D.
  
  Reluctance
Correct Answer
A. Mutual inductance

Explanation
The principle of operation of LVDT is based on mutual inductance. LVDT stands for Linear Variable Differential Transformer, which is a type of electromechanical transducer used for measuring displacement or position. It consists of a primary coil and two secondary coils wound on a cylindrical core. When an AC voltage is applied to the primary coil, it induces a voltage in the secondary coils due to mutual inductance. The displacement of the core changes the mutual inductance between the primary and secondary coils, resulting in a change in the output voltage. Therefore, mutual inductance is the principle that allows LVDT to accurately measure linear displacement.

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49.

What is the relation between scale factor and sensitivity of a transducer?
- A.
  
  Scale factor is double of sensitivity
- B.
  
  Scale factor is inverse of sensitivity
- C.
  
  Sensitivity is inverse of scale factor
- D.
  
  Sensitivity is equal to scale factor
Correct Answer
B. Scale factor is inverse of sensitivity

Explanation
The scale factor of a transducer refers to the ratio of the output signal to the input signal, while the sensitivity of a transducer refers to the change in output signal per unit change in input signal. In this case, the correct answer states that the scale factor is the inverse of sensitivity. This means that as the sensitivity of the transducer increases, the scale factor decreases, and vice versa. In other words, a higher sensitivity will result in a smaller scale factor, indicating a greater change in output signal for a given change in input signal.

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50.

Which of following represent active transducer?
- A.
  
  Strain gauge
- B.
  
  Thermocouple
- C.
  
  Thermistor
- D.
  
  LVDT
Correct Answer
B. Thermocouple

Explanation
A thermocouple is an active transducer because it converts thermal energy into electrical energy. It consists of two dissimilar metals joined together at one end, which creates a voltage difference when exposed to a temperature gradient. This voltage can be measured and used to determine the temperature. In contrast, a strain gauge, thermistor, and LVDT are passive transducers that require an external power source to operate and convert physical quantities into electrical signals.

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Current Version
Mar 21, 2023

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Apr 01, 2019

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