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Test: Transducers- 2 - GATE MCQ


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20 Questions MCQ Test - Test: Transducers- 2

Test: Transducers- 2 for GATE 2024 is part of GATE preparation. The Test: Transducers- 2 questions and answers have been prepared according to the GATE exam syllabus.The Test: Transducers- 2 MCQs are made for GATE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Transducers- 2 below.
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Test: Transducers- 2 - Question 1
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Resistive transducers are ______________

According to the application, exploratory transducers may be primary or secondary transducers.

Test: Transducers- 2 - Question 2
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What will happen to resistance if the length of the conductor is increased?

Detailed Solution for Test: Transducers- 2 - Question 2

As the length of the conductor increases, resistance increases according to expression R = p l/A.

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Test: Transducers- 2 - Question 3
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Which of the following can be measured using change in resistivity?

Detailed Solution for Test: Transducers- 2 - Question 3
Change in resistivity can be brought in the measurement of all the mentioned quantities, as resistivity is sensitive to temperature.
Test: Transducers- 2 - Question 4
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What will happen for resistivity metal and semiconductor if the temperature is increased?
Detailed Solution for Test: Transducers- 2 - Question 4
Metal has a positive temperature coefficient of resistance and semiconductor has a negative temperature coefficient of resistance.
Test: Transducers- 2 - Question 5
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What is the relation of the temperature coefficient of resistivity on the coefficient of thermal expansion in RTD?
Detailed Solution for Test: Transducers- 2 - Question 5
It is used to provide a considerable change in resistance when exposed to temperature.
Test: Transducers- 2 - Question 6
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A metal with a temperature coefficient of resistance has a value of 200; its initial resistance is given by 40Ω. What will be the final resistance value for an increase in 300C to 350C?
Detailed Solution for Test: Transducers- 2 - Question 6
Answer obtained using expression RT=R0(1+αΔT), where α represents temperature coefficient of resistance, R0 and RT represent initial and final resistance values.
Test: Transducers- 2 - Question 7
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Which of the following can be used to measure using thermistors?
Detailed Solution for Test: Transducers- 2 - Question 7
Thermistor at 200C can be used to measure resistance values between 100Ω and 1MΩ.
Test: Transducers- 2 - Question 8
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Thermistors may be in wire form.
Detailed Solution for Test: Transducers- 2 - Question 8
Due to high brittleness, thermistors cannot be formed into wire types. Hence they are shaped into bead form.
Test: Transducers- 2 - Question 9
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Which of the following is correct for thermistors?
Detailed Solution for Test: Transducers- 2 - Question 9
For thermistors, as temperature increases, resistance decreases.
Test: Transducers- 2 - Question 10
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Thermistors have high stability.
Detailed Solution for Test: Transducers- 2 - Question 10
The stability of thermistors is not satisfactory. They can be improved by using high temperatures.
Test: Transducers- 2 - Question 11
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Capacitive transducers can be used by _______________
Detailed Solution for Test: Transducers- 2 - Question 11
Capacitance of a material is affected by the area and distance of separation of plates and dielectric material.
Test: Transducers- 2 - Question 12
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Capacitive transducers cannot be used as strain gauges.
Detailed Solution for Test: Transducers- 2 - Question 12
Strain to be measured is applied to parallel plates of a capacitor, and total displacement change will be proportional to strain.
Test: Transducers- 2 - Question 13
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Which of the following is correct for the capacitive transducer?
Detailed Solution for Test: Transducers- 2 - Question 13
Capacitive transducers find application in measuring both strain, pressure, and angular displacement. Hence all of the mentioned can be treated as applications of capacitive transducers.
Test: Transducers- 2 - Question 14
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For a material capacitance increases with _____________
Detailed Solution for Test: Transducers- 2 - Question 14
Capacitance can be represented as C=ε0εrA / d

Where,

εr represents dielectric constant

A is the area of the plate

d is the distance between plates.

Test: Transducers- 2 - Question 15
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Which of the following is correct for moisture transducers?
Detailed Solution for Test: Transducers- 2 - Question 15
Dielectric constant of pure water is 80, which is much greater than other materials; this characteristic helps in measuring moisture content.
Test: Transducers- 2 - Question 16
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Which of the following devices is used for measuring relative humidity?
Detailed Solution for Test: Transducers- 2 - Question 16
Hygrometers are special devices applicable for measuring the relative humidity of a medium.
Test: Transducers- 2 - Question 17
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Which of the following quantities cannot be measured by capacitive transducers?
Detailed Solution for Test: Transducers- 2 - Question 17
Capacitive transducer finds application in measuring almost all quantities like displacement, thickness, moisture speed, etc.
Test: Transducers- 2 - Question 18
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Which of the following have high relative permittivity?
Detailed Solution for Test: Transducers- 2 - Question 18
Dielectric constant or relative permittivity of Bakelite is about 4.4; for marble, it varies from 8 to 10, and for paraffin, it is only 2.2.
Test: Transducers- 2 - Question 19
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Capacitive microphone is an application of ______________
Detailed Solution for Test: Transducers- 2 - Question 19
In the microphone, electric signals are produced according to pressure variations caused by acoustic waves, which displacement transducers can easily measure.
Test: Transducers- 2 - Question 20
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Thermometers are not possible using a capacitive transducer.
Detailed Solution for Test: Transducers- 2 - Question 20
Capacitive transducers can be used to measure temperature in a way similar to moisture measurement.
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