Temperature Transducers MCQs with Answers Page-2

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Temperature Transducers MCQs with answers: Following Multiple Choice Questions (MCQs) are based on “Temperature Transducers” also known as “Temperature Sensors”

Transducers such as RTD, Thermistors and Thermocouples, Peltier Cell and Pyrometers are included in this section. It is related with the subject Instrumentation or Industrial Measurement and Applications.

This topic is mostly beneficial in the field of Electronics, Electrical and Mechanical Engineering.

These MCQs will be useful in various competitive examinations, entrance examinations, oral examination (Viva voce), certifications and interviews.

Following multiple choice questions are based on Temperature transducers such as Thermocouples, Thermopiles, Pyrometers, Peltier cells
Que.1 Thermocouple is a/an ______ transducer.
  1. Passive
  2. Active
  3. Digital
  4. Secondary

✔ View Answer

Option 2: Active

Explanation: Thermocouple produces some e.m.f. between two junctions.
Que.2 Which temperature sensor has highest temperature range?
  1. RTD
  2. Thermistor
  3. Thermocouple
  4. Silicon resistive sensor

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Option 3: Thermocouple

Que.3 Which of the following effect is not related with Thermoelectric sensors or actuators?
  1. Seebeck effect
  2. Peltier effect
  3. Thomson effect
  4. Hall effect

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Option 4: Hall effect

Que.4
(i) In thermopile many thermocouples are connected in parallel electrically.
(ii) Silicon resistive sensors have positive temperature coefficient.
  1. Only statement (i) is correct.
  2. Only statement (ii) is correct.
  3. Both statements are correct.
  4. Both statements are wrong.

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Option 4: Both statements are wrong.

Explanation: In thermopile two or more thermocouples are connected in series electrically so as to increase output voltage.
Silicon resistive sensors are made from semiconductors. All semiconductors have Negative Temperature Coefficient that is resistance decreases with increase in temperature.
Que.5 Iron-Constantan thermocouple is known as ___ type thermocouple.
  1. T
  2. J
  3. K
  4. E

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Option 2: J

Que.6 K-type thermocouple is made of
  1. Iron-Constantan
  2. Copper-Constantan
  3. Chromel-Alumel
  4. Chromel-Constantan

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Option 3: Chromel-Alumel

Explanation:
Copper-Constantan: T-type
Iron-Constantan: J-type
Chromel-Alumel: K-type
Chromel-Constantan: E-type
Que.7 Identify correct statement/s from the following for Thermocouple.
i. Seebeck coefficients are from a few microvolts to a few millivolts per degree Centigrade.
ii. Induced e.m.f. due to external sources cause noise.
  1. Only statement (i) is correct.
  2. Only statement (ii) is correct.
  3. Both statements are correct.
  4. Both statements are wrong.

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Option 3: Both statements are correct.

Que.8 Identify the correct statement/s.
i. Semiconductor thermopiles are known as Peltier cells.
ii. Semiconductor thermocouple has higher output than metal-based devices.
  1. Only statement (i) is correct.
  2. Only statement (ii) is correct.
  3. Both statements are correct.
  4. Both statements are wrong.

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Option 3: Both statements are correct.

Que.9 Which of the following is a non-contact type temperature transducer?
  1. Peltier cells
  2. Pyrometer
  3. Thermocouple
  4. Thermopile

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Option 2: Pyrometer

Que.10 Optical pyrometers are generally used for measurement of
  1. Low temperature
  2. Low pressure
  3. High temperature
  4. High pressure

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Option 3: High temperature

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