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Fuel-cell systems that also utilize the heat produced can achieve efficiencies approaching 80%, more than double of gas-turbine based electrical generation. Assume that 20 million households produce an average of 5kW. Calculate the percentage of electricity generation by these fuel-cell systems compared to the annual electricity generation in the U.S. of 3.8x109 MW-hrs
Find all values of alpha such that the system is stable for K = 2. If the unity feedback closes around this G(s) and an input is a unit step r(t) = 1u(t), what is the stead-state error, e_ss, as a function of alpha and K?
A candidate material for a turbine blade application oxidizes by diffusion of metal atoms through the oxide to the metal surface, where metal and oxygen react to form the oxide. After 10 hours at 550*C, an oxide layer 8µm thick has formed.
Which sample produces greater Hall voltage: long and narrow or short and wide Thickness (d) is same in both the cases. With little explanations please. 1) If the concentration of scattering centers increase in the semiconductor, would it increase o..
1- A one-meter long wire antenna is center fed by a source with frequency 30 MHz : i- find the wavelength and the current distribution along the antenna . ii- find the radiation resistance. iii- if the source is now replaced by another with frequency..
Your will simulate 10lottery drawings. Store those data to a 3 10 array. The rowsindicate the three balls in a lottery drawing. The columns indicatethe 10 times drawings.
The electric field in a region of space is E= 4 ax V/m and the magnetic flux density is B= 5 az Wb/m2. At t= 0 a particle with mass 1 kg and charge 1 C is located at the origin traveling at a velocity of u0= 10 ay m/s.
Derive the state diagram for an FSM that has an input w and an output z. The machine has to generate z = 1 when the previous four values of w were 1001 or 1111; otherwise, z = 0. Overlapping input patterns are allowed.
Design a high-pass op amp filter with a high-frequency gain of -100 and a cutoff frequency of 1kHz. Resistors with values of 1kohm, 10khom, and 100kohm are available. Determine the capacitance and resistance values of the filter.
Ted Williams hits a baseball with an initial velocity of 120 miles per hour (176 ft/s) at an angle of f = 35 degrees to the horizontal. The ball is struck 3 feet above home plate. You watch as the ball goes over the outfield wall 420 feet away
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.
Let X be a zero-mean random variable having a variance of 9 and let Y be another zero-mean random variable. The sum of X and Y has a variance of 29 and the difference of X and Y has a variance of 21.
An infinitesimally thin metallic cylindrical shell of radius 4.00 cm is centered on the z-axis, and has an evenly distributed charge of 100 nC per meter length of shell. (a) Determine the value of the surface charge density on the conductive shell
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