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Test: Transducers- 6 - GATE MCQ


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25 Questions MCQ Test - Test: Transducers- 6

Test: Transducers- 6 for GATE 2024 is part of GATE preparation. The Test: Transducers- 6 questions and answers have been prepared according to the GATE exam syllabus.The Test: Transducers- 6 MCQs are made for GATE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Transducers- 6 below.
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Test: Transducers- 6 - Question 1
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Piezoelectric transducer is used for measuring __________.

Detailed Solution for Test: Transducers- 6 - Question 1
A piezoelectric transducer is used for measuring non-electrical quantities such as vibration, acceleration, pressure, and the intensity of sound.
Test: Transducers- 6 - Question 2
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Piezoelectric transducer consists of _________.

Detailed Solution for Test: Transducers- 6 - Question 2
A piezoelectric transducer consists of a quartz crystal. It comprises silicon and oxygen arranged in a crystal structure of SiO2.
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Test: Transducers- 6 - Question 3
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A piezoelectric transducer has a _________.

Detailed Solution for Test: Transducers- 6 - Question 3
The sensitivity is high in a piezoelectric transducer. A piezoelectric transducer can be used as a sensor. It can also be used in an accelerometer due to its good frequency response.
Test: Transducers- 6 - Question 4
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A quartz crystal is _________.
Detailed Solution for Test: Transducers- 6 - Question 4
The quartz crystal is a self-generating transducer. It does not need any electric voltage for operation. The quartz crystal becomes short in length due to an applied electric field in the opposite direction.
Test: Transducers- 6 - Question 5
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Mutual inductance depends on _________.
Detailed Solution for Test: Transducers- 6 - Question 5
The mutual inductance of a pair of coils depends on the self-inductance of the individual coils and the coefficient of coupling.
Test: Transducers- 6 - Question 6
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Self-inductance depends on ________.
Detailed Solution for Test: Transducers- 6 - Question 6
The self-inductance of an inductor is obtained using the relation L = N2 / S, where N is the number of coil S is the reluctance of the coil (A/Wb). As reluctance depends on the permeability, the self-inductance of a coil depends on the permeability.
Test: Transducers- 6 - Question 7
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Based on the self-inductance of a coil, how many types of inductive transducers are available?
Detailed Solution for Test: Transducers- 6 - Question 7
Based on the self-inductance of an inductive coil, there are four types of inductive transducers available.

They are as follows:

i) Variable permeability inductive transducer

ii) Variable reluctance inductive transducer

iii) Eddy current inductive transducer

iv) Linear variable differential transducer

Test: Transducers- 6 - Question 8
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An inductive transducer measures the variation in ________.
Detailed Solution for Test: Transducers- 6 - Question 8
Inductive transducer measures the variation in the self-inductance and mutual inductance of an inductive coil. Variation in the inductance is measured as a change in the displacement.
Test: Transducers- 6 - Question 9
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What is the relation between the self-inductance and the reluctance of a coil?
Detailed Solution for Test: Transducers- 6 - Question 9
The self-inductance of an inductor is obtained by using the relation L = N2 / S, where N is the number of coil S is the reluctance of the coil (A/Wb). We observe from the above equation that the self-inductance of a coil is inversely proportional to its reluctance.
Test: Transducers- 6 - Question 10
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Photovoltaic transduction involves ___________.
Detailed Solution for Test: Transducers- 6 - Question 10
In a photovoltaic transduction-based system, measurand is converted into voltage when the junction between different elements is illuminated.
Test: Transducers- 6 - Question 11
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Analog transducers convert input into ___________.
Detailed Solution for Test: Transducers- 6 - Question 11
The analog transducers convert input into an analog signal. The output is a continuous function of time. Strain gauge, LVDT, thermistor, etc., are analog transducers as they produce a constant time.
Test: Transducers- 6 - Question 12
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Inductive transduction involves ___________.
Detailed Solution for Test: Transducers- 6 - Question 12
In an inductive transduction-based system, measurand involves a change in the self-inductance of the coil.
Test: Transducers- 6 - Question 13
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Capacitive transduction involves ___________.
Detailed Solution for Test: Transducers- 6 - Question 13
In capacitive transduction, measurand involves the change in the capacitance. Capacitance changes when the distance between the plates is varied or by a change in the dielectric.
Test: Transducers- 6 - Question 14
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In electromagnetic based transduction measurand is ___________.
Detailed Solution for Test: Transducers- 6 - Question 14
Electromagnetic transduction involves converting the measurand into an electromotive force. Magnetic flux is produced due to the relative motion between the magnet and an electromagnet.
Test: Transducers- 6 - Question 15
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Active transducers are classified into ____________.
Detailed Solution for Test: Transducers- 6 - Question 15
Active transducers can be subdivided into four types.

They are as follows:

  • Photovoltaic

  • Thermoelectric

  • Piezoelectric

  • Electromagnetic

Test: Transducers- 6 - Question 16
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In kitchen applications a piezoelectric crystal is used for _________.
Detailed Solution for Test: Transducers- 6 - Question 16
A piezoelectric lighter is used for lighting a gas-based stove in kitchen applications. The pressure-induced on the piezoelectric sensor creates an electric signal leading to a spark.
Test: Transducers- 6 - Question 17
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A piezoelectric transducer is an ignition source for a cigarette.
Detailed Solution for Test: Transducers- 6 - Question 17
Cigarettes use piezoelectric transducers as a source of ignition. They are also used to measure sonar, microphone, pressure, displacement, and force.
Test: Transducers- 6 - Question 18
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Piezoelectric crystals __________.
Detailed Solution for Test: Transducers- 6 - Question 18
A piezoelectric crystal dissolves in water. It is fully soluble in water. When the temperature is humid, the piezoelectric crystals get dissolved in water.
Test: Transducers- 6 - Question 19
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Piezoelectric crystals produce _________.
Detailed Solution for Test: Transducers- 6 - Question 19
Piezoelectric crystals can be used in spark-ignition engines. They are also used in electrostatic dust filters and produce high voltage at low current.
Test: Transducers- 6 - Question 20
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Active transducers develops ______________.
Detailed Solution for Test: Transducers- 6 - Question 20
Active transducers are also known as self-generating types of transducers. They develop an electrical voltage or current proportional to the quantity being measured.
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How do passive transducers develop electrical signals?
Detailed Solution for Test: Transducers- 6 - Question 21
Passive transducers develop electrical signals using an external source. They are usually known as externally power-driven sources.
Test: Transducers- 6 - Question 22
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When a compressive force is applied to a quartz crystal then ____________.
Detailed Solution for Test: Transducers- 6 - Question 22
When a quartz crystal is subjected to compressive stress, positive charges are induced on one side of the crystal while negative charges are induced on the other side of the crystal.
Test: Transducers- 6 - Question 23
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Microphone converts light into heat.
Detailed Solution for Test: Transducers- 6 - Question 23
A microphone is used to convert the pressure-induced sound waves into an electric signal. The electrical signal is then amplified to produce a louder sound.
Test: Transducers- 6 - Question 24
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Inverse transducer converts electrical into a physical quantity.
Detailed Solution for Test: Transducers- 6 - Question 24
An inverse transducer is used to convert an electrical quantity into a physical quantity. For example, a loudspeaker converts an electrical signal into a sound signal.
Test: Transducers- 6 - Question 25
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Reluctance of a coil is given by which of the following relation?
Detailed Solution for Test: Transducers- 6 - Question 25
The reluctance of an inductance coil is given by the relation S = 1 / μA where l is the length of the magnetic circuit (m) a is the area of the magnetic circuit which encloses the flux (m2) µ is the permeability of the core (H/m).
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