Given the solution and choose the correct answer for the following: 1- A body with surface temperature Ts=985 °C and e=0.85, the radiation heat transfer is 2000W, Tsur = 25°C and o=5.67 x 10 W/m² K. The surface area of the body is: a) 0.0071 m² b) 0.027 m² c) 0.039 m² d) None 2- One side of a plane wall is maintained at 35.7 C and is exposed to a fluid with T. -10°C. If the heat flux is 257 W/m², the heat transfer coefficient is: a) 5 W/m²°C b) 15 W/m²ºC c) 25 W/m²°C d) None 3-The left face of a wall of thickness 0.2m is maintained at 80°C and the right face is exposed to air at Too-30°C. h.-10 W/m²K. If k- 1.2 W/m K and the wall area A= 1 m², the heat transfer rate is: a) 113.8 W b) 132.6 W c) 187.5 W d) None 4- A plan wall with A-1.2 m², thickness L-8 mm and k=0.78 W/m °C. The left surface is is imposed to the fluid Too, -20°C, hoo₁ =10 W/m² K while for the right surface Too₂ = -10°C, hoo -40 W/m² K. Find the heat transfer rate a) 266 W b) 372 W c) 621 W d) None 5- A tube (L-1m) of outer radius 2.5 cm and inner radius 2 cm, the temperature of inner surface Ti- 80°C, and for the outer surface To= 25°C. If the rate of heat transfer q-15487 W, what is the conductivity of the tube. a) 10 W/m K b) 15 W/m K c) 25 W/m K d) None
Given the solution and choose the correct answer for the following: 1- A body with surface temperature Ts=985 °C and e=0.85, the radiation heat transfer is 2000W, Tsur = 25°C and o=5.67 x 10 W/m² K. The surface area of the body is: a) 0.0071 m² b) 0.027 m² c) 0.039 m² d) None 2- One side of a plane wall is maintained at 35.7 C and is exposed to a fluid with T. -10°C. If the heat flux is 257 W/m², the heat transfer coefficient is: a) 5 W/m²°C b) 15 W/m²ºC c) 25 W/m²°C d) None 3-The left face of a wall of thickness 0.2m is maintained at 80°C and the right face is exposed to air at Too-30°C. h.-10 W/m²K. If k- 1.2 W/m K and the wall area A= 1 m², the heat transfer rate is: a) 113.8 W b) 132.6 W c) 187.5 W d) None 4- A plan wall with A-1.2 m², thickness L-8 mm and k=0.78 W/m °C. The left surface is is imposed to the fluid Too, -20°C, hoo₁ =10 W/m² K while for the right surface Too₂ = -10°C, hoo -40 W/m² K. Find the heat transfer rate a) 266 W b) 372 W c) 621 W d) None 5- A tube (L-1m) of outer radius 2.5 cm and inner radius 2 cm, the temperature of inner surface Ti- 80°C, and for the outer surface To= 25°C. If the rate of heat transfer q-15487 W, what is the conductivity of the tube. a) 10 W/m K b) 15 W/m K c) 25 W/m K d) None
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Transcribed Image Text:Given the solution and choose the correct answer for the following:
1- A body with surface temperature Ts=985 °C and e=0.85, the radiation heat transfer is 2000W,
Tsur = 25°C and o=5.67 x 10 W/m² K. The surface area of the body is:
a) 0.0071 m²
b) 0.027 m²
c) 0.039 m²
d) None
2- One side of a plane wall is maintained at 35.7 C and is exposed to a fluid with T. -10°C. If
the heat flux is 257 W/m², the heat transfer coefficient is:
a) 5 W/m²°C
b) 15 W/m²ºC
c) 25 W/m²°C
d) None
3-The left face of a wall of thickness 0.2m is maintained at 80°C and the right face is exposed to air at
Too-30°C. h.-10 W/m²K. If k- 1.2 W/m K and the wall area A= 1 m², the heat transfer rate is:
a) 113.8 W
b) 132.6 W
c) 187.5 W
d) None
4- A plan wall with A-1.2 m², thickness L-8 mm and k=0.78 W/m °C. The left surface is is
imposed to the fluid Too, -20°C, hoo₁ =10 W/m² K while for the right surface Too₂ = -10°C,
hoo -40 W/m² K. Find the heat transfer rate
a) 266 W
b) 372 W
c) 621 W
d) None
5- A tube (L-1m) of outer radius 2.5 cm and inner radius 2 cm, the temperature of inner surface
Ti- 80°C, and for the outer surface To= 25°C. If the rate of heat transfer q-15487 W, what is the
conductivity of the tube.
a) 10 W/m K
b) 15 W/m K
c) 25 W/m K
d) None
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