Adiabatic and Reradiating Surfaces MCQ

Test your knowledge with important Adiabatic and Reradiating Surfaces MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Adiabatic and Reradiating Surfaces MCQs at Bissoy

• What is the unit of coefficient of radiant heat transfer?
  ক

  W/K

  খ

  W/m2 K

  গ

  W/m2

  ঘ

  W/m K
• 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
  ক

  194 W

  খ

  184 W

  গ

  174 W

  ঘ

  164 W
• 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
  ক

  168.3 W

  খ

  158.3 W

  গ

  148.3 W

  ঘ

  138.3 W
• Consider the above problem, find how this heat loss would be affected if the cavity is positioned with bigger diameter at the base
  ক

  75.06 % (increase)

  খ

  55.06 % (decrease)

  গ

  65.06 % (increase)

  ঘ

  75.06 % (decrease)
• A cavity in the shape of a frustum of a cone has diameter 30 cm and 60 cm and the height is 80 cm. If the cavity is maintained at temperature of 800 K, determine the heat loss from the cavity when the smaller diameter is at the bottom
  ক

  6577 W

  খ

  2367 W

  গ

  8794 W

  ঘ

  3675 W
• A blind cylindrical hole of 2 cm diameter and 3 cm length is drilled into a metal slab having emissivity 0.7. If the metal slab is maintained at 650 K, make calculations for the radiation heat escape from the hole
  ক

  7 W

  খ

  3 W

  গ

  1 W

  ঘ

  9 W
• Heat exchange between two gray surfaces enclosed by an adiabatic surface is given by . b) Q 12 = A σ b (T 14 – T 24) / . c) Q 12 = A σ b (T 14 – T 24) / . d) Q 12 = A σ b (T 14 – T 24) / .
  ক

  Q 12 = A (T 14 – T 24) / .

  খ

  1/E 1 + 1/E 2 – 2 + 2/1 + F 12

  গ

  1/E 1 + 1/E 2 – 2 + 2/1 + F 12

  ঘ

  1/E 1 + 1/E 2 – 2 + 2/1 + F 12
• Heat exchange between two black surfaces enclosed by an insulated surface is given by . b) Q 12 = 2 A 1 σ b (T 14 – T24) . c) Q 12 = 3 A 1 σ b (T 14 – T24) . d) Q 12 = 4 A 1 σ b (T 14 – T24) .
  ক

  Q 12 = A 1 σ b (T 14 – T24) .

  খ

  A 2 – A 1 F 122/A 1 + A 2 – 2 A 1 F 12

  গ

  A 2 – A 1 F 122/A 1 + A 2 – 2 A 1 F 12

  ঘ

  A 2 – A 1 F 122/A 1 + A 2 – 2 A 1 F 12
• Two black discs each of diameter 50 cm are placed parallel to each other concentrically at a distance of one meter. The discs are maintained at 1000 K and 500 K. Calculate the heat flow between the discs when the disks are connected by a cylindrical black no-flux surface
  ক

  2417.68 W

  খ

  3417.68 W

  গ

  4417.68 W

  ঘ

  5417.68 W
• Two black discs each of diameter 50 cm are placed parallel to each other concentrically at a distance of one meter. The discs are maintained at 1000 K and 500 K. Calculate the heat flow between the discs when no other surface is present
  ক

  317.27 W

  খ

  417.27 W

  গ

  517.27 W

  ঘ

  617.27 W