Instrumentation Transducers Questions and Answers – Thermography and Thermometry

This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “Thermography and Thermometry”.

1. Which of the following produce em radiation in ir region?
a) Body with negative temperature
b) Body with temperature less than 1000C
c) Body with temperature less than 6000C
d) Body with temperature less than 10000C
View Answer

Answer: c
Explanation: Body with temperature between 0 to 6500C emit em radiation in infra-red region.

2. Energy of emitted radiation from a body increases with ______________
a) Increase in temperature
b) Decrease in temperature
c) No relation with temperature
d) Net energy cannot be changed
View Answer

Answer: a
Explanation: Net energy emitted by the body can be increased by increasing temperature.

3. Wavelength of peak radiation is represented by _____________
a) 28.91 * T
b) 2891/T
c) 189 * T
d) None of the mentioned
View Answer

Answer: b
Explanation: Ratio of 2891 and temperature gives wavelength at which peak radiation is seen.
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4. At 1000C wavelength of radiation will be ______________
a) Less than 10um
b) Less than 100um
c) Less than 1000um
d) Less than 10nm
View Answer

Answer: a
Explanation: At 1000C 90% of emitted radiation will have less than 10um wavelength.

5. Radiation thermometers are pyrometers.
a) True
b) False
View Answer

Answer: a
Explanation: Radiation thermometers are also known as pyrometers.
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6. Temperature sensor of silicon can detect wavelength of ______________
a) Less than 0.1 um
b) Less than 1.1 um
c) Less than 10nm
d) Greater than 100nm
View Answer

Answer: b
Explanation: Silicon sensors can sense wavelength of less than 1.1 um.

7. Which of the following sensor have a large response time?
a) Thermopile
b) Pyroelectric sensor
c) Lead sulphide sensor
d) Silicon sensor
View Answer

Answer: a
Explanation: Thermopile requires large response time (100ms).
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8. IR thermograph is also known as_______________
a) Thermogram
b) Heat thermograph
c) Thermogram
d) None of the mentioned
View Answer

Answer: c
Explanation: Infra-red thermograph is also known as thermogram.

9. IR thermography is useful in the medical field.
a) True
b) False
View Answer

Answer: a
Explanation: Many types of disease can be detected by using IR thermography.
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10. Which of the following sensors provide higher temperature capacity?
a) Thermopile
b) Pyroelectric sensor
c) Lead sulphide sensor
d) Silicon sensor
View Answer

Answer: d
Explanation: Silicon sensors have higher temperature capacity of 4000C.

Sanfoundry Global Education & Learning Series – Instrumentation Transducers.

To practice all areas of Instrumentation Transducers, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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