Answer:
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Explanation:
A 15 cm × 15 cm circuit board dissipating 20 W of power uniformly is cooled by air, which approached the circuit board at 20C w
ith a velocity of 6 m/s. Assume the flow to be turbulent, since the electronic components are expected to act as turbulators. Disregard any heat transfer from the back surface of the board, and suppose that radiation heat transfer is negligible. Evaluate thermal properties of the air at a film temperature of 27C. Determine the surface temperature (C) of the electronic components at the following locations i) the leading edge of the board ii) the trailing edge of the board
1 answer:
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Answer:
factor of safety = 0.8
Explanation:
given data
maximum gauge pressure in steel p = 10 MPa
outer diameter do = 200 mm
wall thickness t = 2 mm
ultimate stress of the steel σU = 400 MPa
solution
We check the type of shell that is
so we can see that that is
so that it mean vessel is a thin shell now we can we get maximum pressure by the maximum tensile stress is
σ = .......................1
put here value and we get
σ =
σ = 500 MPa
so factor of safety will be express as
factor of safety = ..........2
factor of safety =
factor of safety = 0.8
Answer
given,
P₁ = 10 MPa T₁ = 800
P₂ = 800 KPa T₂ = ?
Using formula
For steam n = 1.33
T₂ = 573.368 K
T₂ = 573.368 - 273 = 300.368 °C
=
=
W = 434.53 kJ/kg