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A plate of thickness 2L = 25 mm at a temperature of 600°C is removed from a hot pressing operation and must be cooled rapidly in order to achieve the required physical properties. The process engineer plans to use air jets to control the rate of cooling. but she is uncertain whether it is necessary to cool both sides (case 1) or only one side (case 2) of the plate. The concern is not just for the time-to-cool, but also for the maximum temperature difference within the plate. If this temperature difference is too large, the plate can experience significant warping.
The air supply is at 25°e, and the convection coefficient on the surface is 400 W/m2 · K. The thermo physical properties of the plate are p = 3000 kg/m3, c = 750 J/kg · K. and k = 15 W/m · K.
(a) Using the IHT software, calculate and plot on one graph the temperature histories for cases I and 2 for a 500-s cooling period. Compare the times required for the maximum temperature in the plate to reach 100°C. Assume no heat loss from the unexposed surface of case 2.
(b) For both cases, calculate and plot on one graph the variation with time of the maximum temperature difference in the plate. Comment on the relative magnitudes of the temperature gradients within the plate as a function of time.
It is given that the energy consumed by a computer system is (100 Joules/sec^2)*t^2 Joules during the first second after being activated at t=0. What is the average power dissipation during this time
a) construct a moore state table for a sequential circuit that has an input (x) and an output (z). the output is the sameas the input was two clock periods previously. for example x = 0 1 0 1 1 0 1 0 1 1 0 1 0 0 0 1 z = 0 0 0 1 0 1 1 0 1 0 1 1 0 ..
Note that after a collision, the expected numbers are slightly different in two systems, but the difference is unimportant since collisions are rare.
A sampled-data system such as that presented in problem (i) has a sampling period T = 0.05s and has G(z) = K (z3 + 10.3614z2 + 9.758z + 0.8353) / (z4 - 3.7123z3 + 5.1644z2 - 3.195z + 0.7408) 1. Determine K when the two real poles break away from the ..
The population mean is a random variable.
A sirloin steak (e'r = 52.4, µr = 1, tan dc = 0.33) is to be heated in a microwave oven operating at 2.45 Ghz. (a) Determine the uniform plane wave penetration depth. (b) Determine the complex impedance of the material.
A charge Q is placed on each sphere> the electric force of repulsion separates the spheres, and an equilibrium is reached when the suspending threads make an angle of 10 degrees. Assuming a gravitational force of 9.80(N/kg) and a negligible mass f..
20 pts using the symbol table on the right show the lc-3 assembly language generated by a non- optimizing c compiler
Project on LFC using tuned FOPID. I have considered a two area model. Need help regarding implementation of GA MATLAB code for a two area interconnected power system for LOAD FREQUENCY CONTROL.
8 bit DAC with a 5 volt reference connects to a light source with an intensity given by Il=45V^(3/2)W/m^2 a. what is the range of intensity that can be produced b. what intensities are produced by digital inputs of 1bh, 7ah,9fh,e5h
In a particular technology, a small BJT operating at vBE = 28VT conducts a collector current of 100 µA. What is the corresponding saturation current. For a transistor in the same technology but with an emitter junction that is 32 times larger.
A transmission line has the following per-unit-length parameters: L = 0.5 H/m, C = 200 pF/m, R = 4.0 /m, and G = 0.02 S/m. Calculate the propagation constant and characteristic impedance of this line at 800 MHz. If the line is 30 cm long
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