MCQs
Heat Radiation, Thermal Properties Of Matter, Dual Nature Of Matter
Total Questions : 247
| Page 24 of 25 pages
Answer: Option A. -> 0.0001-0.0002 m² K/W
Answer: (a).0.0001-0.0002 m² K/W
Answer: (a).0.0001-0.0002 m² K/W
Answer: Option A. -> M
Answer: (a).M
Answer: (a).M
Answer: Option A. -> 1/π
Answer: (a).1/π
Answer: (a).1/π
Answer: Option B. -> 7396.28 W/m² sr
Answer: (b).7396.28 W/m² sr
Answer: (b).7396.28 W/m² sr
Answer: Option C. -> E = σ T⁴ d A
Answer: (c).E = σ T⁴ d A
Answer: (c).E = σ T⁴ d A
Question 236. Consider a deep-space probe constructed as 1 m diameter polished aluminum sphere. Estimate the equilibrium temperature that the probe reaches if the solar energy received is 300 W/m². For solar radiation, absorptivity of aluminum is 0.3 and the average emissivity appropriate for aluminum at low temperature is 0.04
Answer: Option B. -> 315.67 K
Answer: (b).315.67 K
Answer: (b).315.67 K
Answer: Option D. -> 6500 W/m² sr
Answer: (d).6500 W/m² sr
Answer: (d).6500 W/m² sr
Answer: Option D. -> 90
Answer: (d).90
Answer: (d).90
Answer: Option B. -> 3 W
Answer: (b).3 W
Answer: (b).3 W
Question 240. Two large parallel planes with emissivity 0.4 are maintained at different temperatures and exchange heat only by radiation. What percentage change in net radiative heat transfer would occur if two equally large radiation shields with surface emissivity 0.04 are introduced in parallel to the plates?
Answer: Option D. -> 95.1%
Answer: (d).95.1%
Answer: (d).95.1%
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