This set of Instrumentation Transducers Multiple Choice Questions & Answers (MCQs) focuses on “IR Radio Sensors”.
1. Which of the following is not a part of electro magnetic radiation?
a) UV
b) Visible region
c) IR spectra
d) None of the mentioned
View Answer
Explanation: All three regions mentioned are part of electro magnetic radiation.
2. Which of the following represents IR wavelength?
a) 100 nm to 700 nm
b) 700 nm to 2500 nm
c) 2500 nm to 5000 nm
d) Greater than 2500 nm
View Answer
Explanation: IR radiation wavelength is in the region between 700 nm and 2500 nm.
3. Infra red radiation sources may be _______________
a) Thermal source
b) Non-thermal source
c) Thermal or non-thermal source
d) None of the mentioned
View Answer
Explanation: Sources that produce IR radiation may be thermal or non-thermal in behaviour.
4. Every hot body emits IR radiation.
a) True
b) False
View Answer
Explanation: IR radiation is the heat wave and every hot body emits IR radiation.
5. Tungsten filament lamp is a _______________
a) Thermal source
b) Non-thermal source
c) Thermal or non-thermal source
d) None of the mentioned
View Answer
Explanation: Tungsten filament lamp is a non-thermal source of IR radiation.
6. Which of the following is correct for non-thermal source?
a) Need external supply
b) Doesn’t need an external source
c) Can act as thermal source
d) All of the mentioned
View Answer
Explanation: Non thermal source of IR radiation doesn’t need an external power supply.
7. LED and laser emit radiation in ___________
a) Narrow range
b) Wide range
c) Medium bandwidth
d) Unpredictable bandwidth
View Answer
Explanation: LED and laser emit radiation in narrow range bandwidth.
8. Sensing element in IR thermal detector will be ______________
a) Thermo couple
b) Thermo pile
c) Bolometer
d) All of the mentioned
View Answer
Explanation: All of the mentioned devices can act as a sensing element in the IR thermal detector.
9. Which of the following is the correct relationship for sensitivity?
a) Volt/watt
b) Watt/volts
c) Volt/amp
d) Volts
View Answer
Explanation: Sensitivity is the ratio of a signal obtained to power.
10. Sensitivity can represent in terms of the lumen.
a) True
b) False
View Answer
Explanation: In photonic applications, sensitivity is expressed in terms of the lumen.
Sanfoundry Global Education & Learning Series – Instrumentation Transducers.
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