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A hot fluid at 35°C is to be transported through a tube horizontally positioned in quiescent air at 25°C. Which of the tube shapes, each of equal cross-sectional area, would you use in order to minimize heat losses to the ambient air by free convection?
Use the following correlation of Lien hard (Int. J. Heat Mass Transfer, 16, 2121, 1973) to approximate the laminar convection coefficient for an immersed body on which the boundary layer does not separate from the surface, Nu1 = 0.52Ral1/4. The characteristic length / is the length of travel of the fluid in the boundary layer across the shape surface. Compare this correlation to that given for a sphere to test its utility.
The dielectric strength of air is 3.0 10^6 V/m, and that of neoprene rubber is 1.2 10^7 V/m. A certain air-gap, parallel plate capacitor can store no more than 0.070 J of electrical energy before breaking down. How much energy can this capacitor s..
a dsp system is given with the following specifications: design requirements: sampling rate 20,000 Hz Maximum allowable gain variation from 0 to 4,000 Hz = 2dB 40dB rejection at the frequency of 16000 Hz
assume filter is connected to a pure resistive load. The cutoff frequency is not to drop below 25krad/s. What is the smallest load resistor that can be connected across the output terminals of the filter.
Gaussian random variable W is known to have P[W>4] = 1/2. Based on this information, (a) sketch its possible PDF. (b) Now also assume that Var[W] is very small. Refine your sketch in the first part taking into account this new information.
Suppose we transmitted 5 cos wct for logic one and 15 cos wct for logic zero. Find the maximum signal energy. Design a demodulator and show the detection criterion for the output of the demodulator. Finally, find the bit error-rate.
1. A 3 phase, wye connected synchronous generator rated at 10kVA, 230V has a synchronous reactance of 1.2 ohms per phase and an armature resistance of 0.5 ohms per phase. Calculate the percent voltage regulation at full load if the power fact..
Transfer function in s t = [0-2*Ts : Ts : Tmax] ; Find the actual solution using the inverse laplace transform syms ycont ycont = ilaplace(Gs,t) Sampling times of 0.01, and simulation runs for 10 seconds
Consider the analog filter H(s)=30000/(s^2+400s+30000) , notice that the filter gain in the passband is unity or 0 dB. You can also use MATLAB command "roots" to check for the poles that are p_1=-100 rad/s, and p_2=-300 rad/s.
An InP TED is 0.5 pm long with a cross sectional area of 10" cm2 and is operated in the transit-time mode.(a) Find the minimum electron density no required for transit-time mode.
A random signal X can be observed only in the presence of independent addictive noise N. The observed quantity is Y = X + N.The joint probability density function of X and Y is f(x,y) = K exp[-(x2 + y2 + 4xy)] all x and y
Give an intuitive explanation of why the maximum throughput, for small beta, is approximately the same for CSMA slotted Aloha and FCFS splitting with CSMA. Show the optimal expected number of packets transmitted after a state transmission in an Aloha..
design op amp circuit to produce output vout which is related to inputs v1, v2 and v3 by expression vout= -(3v1+5v2+8v3). assume max permitted resistor value= 200k. use only one op amp
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