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MCQs

Heat Radiation, Thermal Properties Of Matter, Dual Nature Of Matter

Total Questions : 247 | Page 23 of 25 pages
Question 221. When a surface absorbs a certain fixed percentage of striking radiation the surface is called
  1.    Grey body
  2.    Black body
  3.    White body
  4.    Opaque body
 Discuss Question
Answer: Option A. -> Grey body
Answer: (a).Grey body
Question 222. Of the radiant energy 350W/m² incident upon a surface 250W/m² is absorbed, 60W/m² is reflected and the remainder is transmitted through the surface. Workout the value for reflectivity for the surface material
  1.    0.181
  2.    0.171
  3.    0.161
  4.    0.151
 Discuss Question
Answer: Option B. -> 0.171
Answer: (b).0.171
Question 223. A conical cavity of base diameter 15 cm and height 20 cm has inside surface temperature 650 K. If emissivity of each surface is 0.85, determine the net radiative heat transfer from the cavity
  1.    168.3 W
  2.    158.3 W
  3.    148.3 W
  4.    138.3 W
 Discuss Question
Answer: Option A. -> 168.3 W
Answer: (a).168.3 W
Question 224. What is the unit of coefficient of radiant heat transfer?
  1.    W/K
  2.    W/m² K
  3.    W/m²
  4.    W/m K
 Discuss Question
Answer: Option B. -> W/m² K
Answer: (b).W/m² K
Question 225. A cylindrical cavity of base diameter 15 cm and height 20 cm has inside surface temperature 650 K. If emissivity of each surface is 0.85, determine the net radiative heat transfer from the cavity
  1.    194 W
  2.    184 W
  3.    174 W
  4.    164 W
 Discuss Question
Answer: Option C. -> 174 W
Answer: (c).174 W
Question 226. Which of the following have a continuous spectrum?
  1.    Solids
  2.    Liquids
  3.    Gases
  4.    Solids and liquids
 Discuss Question
Answer: Option D. -> Solids and liquids
Answer: (d).Solids and liquids
Question 227. Which of the following is/are known as selective absorbers?
  1.    Solids
  2.    Liquids
  3.    Gases and vapors
  4.    Vapors
 Discuss Question
Answer: Option C. -> Gases and vapors
Answer: (c).Gases and vapors
Question 228. Which one is having lowest value of fouling factor?
  1.    Lake river
  2.    Distilled water
  3.    Transformers
  4.    Lubricating oil
 Discuss Question
Answer: Option B. -> Distilled water
Answer: (b).Distilled water
Question 229. What is the value of fouling factor for oil bearing steam?
  1.    0.0002 m² K/W
  2.    0.0003 m² K/W
  3.    0.0004 m² K/W
  4.    0.0005 m² K/W
 Discuss Question
Answer: Option A. -> 0.0002 m² K/W
Answer: (a).0.0002 m² K/W
Question 230. What is the value of fouling factor for fuel oil?
  1.    0.0009 m² K/W
  2.    0.0010 m² K/W
  3.    0.0011 m² K/W
  4.    0.0012 m² K/W
 Discuss Question
Answer: Option B. -> 0.0010 m² K/W
Answer: (b).0.0010 m² K/W

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