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The system under consideration is an electronic circuit board, oriented vertically in 27 degree C air. Due to electric resistance heating, the circuit board is dissipating a total of 22 Watts. It has dimensions of 16cm by 16cm and is insulated on the back side. The object of this problem is to minimize the temperature of the circuit board. This needs to be done by trying the following four things:
(a) free (or natural) convection (b) forced convection (using a fan for flow) (c) free convection with fins (d) forced convection with fins Note: For the finned cases, apply rectangular pure aluminum fins, 3 mm thick, 1.5cm long, vertical, from bottom to top of the circuit board, neglect "contact resistance" and use the same convection heat transfer coefficient as for the "no fin" cases. Consider applying a single fin or more than one fin. You also do not need to consider radiation heat transger in the calculations. However, you should consider how the resuts for the no-fin cases might change if radiation heat transfer is included in the analysis Calculate the circuit board temperature for each case
Consider a Si phtodiode that is designed for operation at 900 nm. GIven a choice of two possible AR coatings, SiO2 with a refractive ndex of 1.4 and TiO2 with a refractive index of 2.3, which would you use and what would be the thickness of the AR..
Hooke's law describes a certain light spring of unstretched length 33.6 cm. When one end is attached to the top of a doorframe and a 7.31 kg object is hung from the other end, the length of the spring is 42.4 cm.
a. Evaluate X(s) and specify its region of convergence. b. Determine the values of the finite numbers A and t0 such that the Laplace transform G(s) of g(t) = Ae^âˆ'5tu(âˆ't âˆ' t0)
a) Write the system of linear equations in the form of Ax = b: (b) Use Guass-Jordan method to find A inverse (c) Use A inverse to solve the system of equations. -2x1 + x2 +x3 = -12 4x1 + 2x2 + 4x3 = 7 -x1 + x2 + 2x3 = -3
A painter is standing on a work platform that is 27 feet above ground level. For fall protection, the worker''s safety harness D-ring is attached to a 12-foot shock absorbing lanyard that is securely fastened to the structure at a point 40 feet above..
If you have an M/M/Infinity system with arrival rate lambda and service rate mu(µ), how would you show that the expected number of packets in the queue is equal
A single-turn resonant circular loop with a /8 radius is made of copper wire with a wire radius of 10^4 pi f/2 and conductivity of 5.7 × 10^7S/m. For a frequency of 100 MHz, determine, assuming uniform current
A three-phase transmission line having a reactance of 120 ohms per phase is connected to a wye-connected load whose resistance is 160 ohms per phase. If the supply volatge is 70kV line-to-line, calculate a) The line-to-neutral voltage per phase.
Probability of a False Alarm: Noise Power, The fixed threshold of a radar detector was set, assuming a known noise power, to yield P_FA = 10^-6
Methods used to eliminate noise from a spatio-temporal signal, Name and describe, in detail, 2 methods used to eliminate noise from a (spatio-temporal) signal. This question requires a clear, detailed explanation of the methods. Mathematical equation..
A unity feedback control systems for a robot submarine has a plant with a third-order transfer function G(s) = K / (s(s + 10)(s +50)) We want the overshoot to be approximately 7.5% for a step input
Hand calculate the expression for the voltage and current of the capacitor and plot these equations by using MATLAB and calculate the time constants of each circuit and point out this time constants at your voltage graphs.
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