Thermography MCQ

3. What is emissivity? A) Ability to reflect heat B) Ability to emit infrared energy C) Ability to absorb light D) Ability to conduct heat Answer: B) Ability to emit infrared energy Explanation: Emissivity defines how efficiently a surface emits radiation. 4. Ideal blackbody emissivity value is: A) 0 B) 0.5 C) 0.75 D) 1 Answer: D) 1 Explanation: A perfect emitter has emissivity = 1. 5. Which material has low emissivity? A) Human skin B) Black paint C) Polished aluminum D) Rubber Answer: C) Polished aluminum Explanation: Shiny metals reflect IR and emit poorly. 6. What does NETD represent? A) Image resolution B) Thermal sensitivity C) Field of view D) Frame rate Answer: B) Thermal sensitivity Explanation: Lower NETD = better sensitivity. 7. IFOV stands for: A) Infrared Field of Vision B) Instantaneous Field of View C) Internal Frequency of Voltage D) Image Frame Optical Value Answer: B) Instantaneous Field of View Explanation: It defines spatial resolution. 8. What affects temperature measurement accuracy the most? A) Sc…

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