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1. List the main methods for energy storage.
2. Describe the principle of capacitors and the range of storage time in these devices.
3. Describe the principle of the flywheel and its optimal geometry
4. Give a categorization of thermal energy storage systems
Determine the temperature in the middle of the bar and evaluate it at t = 1, 2, 3, 10, 50 sec. First guess, and then calculate. Also, plot the temperature expression vs. time from t = 1 to 50 sec using Excel
The value for the diffusivity of water vapor in air is 0.22 cm2/s at 0°C and 1 atm. The mass velocity of air is taken relative to the pipe wall.
Calculate the currents in the 3-phase lines, neglecting transformer losses. Draw the phasor diagram.
Let x(t) = cos(3/4(t+1/2)+1/4) a. Determine the frequency, the period of x(t) b. Given another signal, y(t)= sin(3/4(t+1)+3/8), is y(t) identical to x(t) Why
Air at 70°F and 100 psia is blown through a porous media which is saturated with liquid water at 70°F. Determine the maximum partial pressure of the water evaporated into the air as it emerges from the porous media.
The torque T causes a rotation of 0.68 at end B of the aluminum bar shown. Knowing that b = 15 mm and G = 26 GPa, determine the maximum shearing stress in the bar.
Suppose that a regular RS code is designed to operate with blocks whose individual symbols are four bits long (so b = 4).
What is the average power in Watts needed of a machine that cools 10 lb/minute of dry air from 20 to 15 degrees Celsius
Find the electrostatic potential on the axis of a uniformly charged cylindrical surface of radius ro and height h. The surface charge density is ρs.
Explain why there are variations between the theoretical and measured values of the tests. Explain why two different methods of power measurement for the same circuit gives different results
Explain how to find a causal, stable LTI system with rational Laplace transform G(s), such that, at least,the magnitude frequency response of H(s) is inverted; i.e.,|G(jω)| = |H(jω)-1|. Hint First show that H(s) can befactored into a series combin..
Find the bus-bar voltage of the station.- Find the maximum safe working voltage of the string. Also find the string efficiency.
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