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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.
Using MatLab, create and graph the pairwise convolution of the following functions (i.e., A must be convolved with B, C, D, and E, individually. B must be convolved with C, D, and E, individually, Etc.). All time scales are -4 to +4.
Frequency multiplers are used at the transmitter to bring up the frequency level to the transmitter level frequency. Why don't we use the crystal oscillator to generate the transmitter level frequency
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An engineering firm consisting of 3 programmers and 6 circuit engineers. The employees are randomly assign to 3 teams of 3, labeled Group 1, Group 2, and Group 3. a) How many ways are there to assign the 9 employees to Groups 1, 2 & 3
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1.)Using the SR0 instruction write the vbc1 assembly code that displays the One-Hot counter from left to right. 2.)Write the VBC1 assembly code that resembles the following behavior
a. Draw thee logic diagram of the circuit b. Determine the FSM type of this clocked Synchronous Sequential Machine c. list the state-table for the sequential circuit d. draw the corresponding state diagram
The Maxwell-Boltzmann distribution is often used to approximate the Fermi- Dirac distribution function. For what range of (E-Ef)/kT is the Maxwell-Boltzmann approximation accurate to within 10%
In region 1, defined by z>0, there is a magnetic field of H= 4.8x ˆ 6y ˆ +8z (A/m) and the relative permeability is 50. Determine the magnetic flux density B in region 2, z
assume QPSK is the modulation method used in a digital communication system.The communication system requires minimum bit error.what is the acceptable bit error assuming additive white gaussian noise.
In a voltage stabilizer circuit with a Zener diode, the output voltage decreases when touching the zener diode with your fingers when no load is connected. Ideally, the output voltage should not drop. Explain why there is a decrease in output volt..
suppose that a continuous time sinusoid x(t) = sqrt(2)*cos(3200*Pi*t + pi/4) is sampled with a sampling frequency of fs, producing the discrete-time signal x[n] = x(n/fs).
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