Electrical Engineering Answers

Consider the state of stress in a bar subject to compression in the axial direction. Lateral expansion is restrained to half the amount it would ordinarily be if the lateral faces were load free. Find the effective modulus of elasticity.

Write clear definitions of the following terms in the context of digital signal processing. Give an example of each and their practical application. (6 Marks)
(a) Filtering
(b) Modulation
(c) Multiplexing

solve for x in the system shown in figure p4.5 if f(t) is unit step

Consider an ultrathin body n-channel MOSFET at 300 K with width
W = 50 μm, length L = 5 μm, body thickness = 20 nm, oxide thickness
h = 70 nm with dielectric constant κ=3.9, VT = 1 V and effective
mobility 800 cm2/Vs (assumed independent of gate voltage).
Calculate:
(a) Idsat if Vg = 2 V
(b) Ron when Vg = 2 V and Vd = 0 V
(c) gm when Vg = 2 V and Vd = 2 V

A power system is supplied from three generating units that have the following cost functions:
Unit A : 13+1.3 Pa +0.037 P2 [$/h]
Unit B : 23 +1.7 Pb + 0.061 PB ($/h]
Unit C: 19+1.87 Pc +0.01 P2 ($/h]
a. How should these units be dispatched if a load of 380 MW is to be supplied at minimum cost?
b. If, beyond supplying a 380-MW load, the system can export (sell) energy to the neighboring country in which the system marginal costs is 10.65 $/MWh. What is the optimal amount of power that should be exported?
c. Repeat problem (b) if the outputs of the generating units are limited as
PMAX = 110 MW follows:
PMAX = 85 MW
PMAX = 266 MW

Cosx log(2y-8)+1/x]dx+(sinx/y-4)dy=0

employ superposition principles to obtain a value for the current i?

Applications of disc method in electrical engineering

A closed cycle gas turbine unit operating is maximum and minimum temperature of 760 and 20 degree Celsius has a pressure ratio of 7/1. Calculate the ideal cycle efficiency and the work ratio

In a carnot cycle operating between 307 and 17 degree Celsius the maximum and minimum pressures are 60 2.4 and 1.04 bar.clclculate the cycle efficiency and the work ratio.assume air yo be working fluid.