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MCQs

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

Total Questions : 247 | Page 17 of 25 pages
Question 161. Two radiating surface A 1 = 6 m² and A 2 = 4 m² have shape factor F 12 = 0.1. Then the shape factor F 21 will beTwo Radiating Surface A 1 = 6 M² And A 2 = 4 M² Have Shape...
  1.    0.12
  2.    0.18
  3.    0.15
  4.    0.10
 Discuss Question
Answer: Option C. -> 0.15
Answer: (c).0.15
Question 162. The reciprocity theorem states that (Where symbols have their usual meanings)The Reciprocity Theorem States That (Where Symbols Have Thei...
  1.    F 12 = F 21
  2.    A 1 F 12 = A 2 F 21
  3.    A 1 F 21 = A 2 F 12
  4.    A 2 F 21 = A 1 F 12
 Discuss Question
Answer: Option B. -> A 1 F 12 = A 2 F 21
Answer: (b).A 1 F 12 = A 2 F 21
Question 163. What is the shape factor of hemispherical surface closed by a plane surface of diameter d?
  1.    0
  2.    1.5
  3.    1
  4.    0.5
 Discuss Question
Answer: Option D. -> 0.5
Answer: (d).0.5
Question 164. In the given diagram let r be the length of the line of propagation between the radiating and the incident surfaces. What is the value of solid angle W?In The Given Diagram Let R Be The Length Of The Line Of Prop...
  1.    A sin α
  2.    A cos α
  3.    2A cos α
  4.    2A cos α
 Discuss Question
Answer: Option B. -> A cos α
Answer: (b).A cos α
Question 165. Consider a system of concentric spheres of radius r 1 and r 2 (r 2 is greater than r 1). If r 1 = 5 cm, determine the radius r 2 if it is desired to have the value of shape factor F 21 equal to 0.6Consider A System Of Concentric Spheres Of Radius R 1 And R ...
  1.    6.45 cm
  2.    7.45 cm
  3.    8.45 cm
  4.    9.45 cm
 Discuss Question
Answer: Option A. -> 6.45 cm
Answer: (a).6.45 cm
Question 166. Establish a relation for shape factor for a conical cavity with respect to itself of depth h and diameter d. The cavity is closed on its outer surface with a flat plateEstablish A Relation For Shape Factor For A Conical Cavity W...
  1.    1 – d/ (4 h² + d)^1/2
  2.    1 – d/ (4 h² + d ²)^1/2
  3.    1 – d/ (4 h + d²)^1/2
  4.    1 – d/ (h² + d²)^1/2
 Discuss Question
Answer: Option B. -> 1 – d/ (4 h² + d ²)^1/2
Answer: (b).1 – d/ (4 h² + d ²)^1/2
Question 167. What is the shape factor for a hemispherical bowl with respect to itself of diameter d? The cavity is closed on its outer surface with a flat plateWhat Is The Shape Factor For A Hemispherical Bowl With Respe...
  1.    1.5
  2.    1
  3.    0.5
  4.    2.5
 Discuss Question
Answer: Option C. -> 0.5
Answer: (c).0.5
Question 168. Which one is true regarding gases?
  1.    Reflectivity is unity
  2.    Absorptivity is zero
  3.    Reflectivity is zero
  4.    Transmissivity is zero
 Discuss Question
Answer: Option C. -> Reflectivity is zero
Answer: (c).Reflectivity is zero
Question 169. Thin glass plate is an example of
  1.    Transparent body
  2.    Opaque body
  3.    Black body
  4.    White body
 Discuss Question
Answer: Option A. -> Transparent body
Answer: (a).Transparent body
Question 170. Radiant energy with an intensity of 800 W/m² strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of reflection
  1.    518.20 W/m²
  2.    418.20 W/m²
  3.    318.20 W/m²
  4.    218.20 W/m²
 Discuss Question
Answer: Option D. -> 218.20 W/m²
Answer: (d).218.20 W/m²

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