Gray Body – MCQs with Answers
1. What is a gray body?a. a body of which the monochromatic emissivity (ε) is different different wavelengths
b. a body of which the monochromatic emissivity (ε) is constant for the entire wavelength spectrum
c. a body of which the monochromatic emissivity (ε) is maximum for longest wavelength
d. none of the above
View Answer / Hide Answer ANSWER: b. a body of which the monochromatic emissivity (ε) is constant for the entire wavelength spectrum
2. The emissive power of gray body isa. less than the emissive power of the black body
b. greater than the emissive power of the black body
c. equal to the emissive power of the black body
d. cannot say
View Answer / Hide Answer ANSWER: a. less than the emissive power of the black body
3. What is the correct formula for the total emissive power of the gray body (Eg)?a. (E
g) = ε σ T
4b. (E
g) = ε T
4c. (E
g) = (1/ε) σ T
4d. none of the above
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