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1. A static population of 900,000 people lives in an area with a background ra diation level that gives each person an extra 125 mrem (whole-body) per year of low LET exposure over that received by people in other parts of the coun try.
(a) Estimate the collective gonad dose to the reproductive population.
(b) Estimate the number of radiation-induced cases of hereditary illness that occurs in each generation.
(c) Compare this number to the natural incidence of genetic illness in this population.
A 6 pole round rotor 3 phase star connected synchronous machine has the following test results: Open circuit test: 4000 V line to line at 1000 rev/min, 50 A rotor current Short circuit test: 300 A at 500 rev/min, 50 A rotor current
A silicon semiconductor at T=300K is homogeneously doped with Nd=5e15 cm^-3 and Na=0. a) determine the thermal equilibrium concentration of free electrons and free holes. B) calculate the drift current density for an applied electric field of E=30..
Calculate IB and IE for 0
A THREE PHASE, Y-CONNECTED, 60Hz, TWO POLES SYNCHRONOUS MACHINE HAS A STATOR WITH 5000 TURNS OF WIRE PER PHASE.WHAT ROTOR FLUX WOULD BE REQUIRED TO PRODUCE A TERMINAL (LINE-TO-LINE) VOLTAGE OF 13.2kV
Two machines and a lighting load are connected in parallel to a 240 V(rms), 60 Hz line. The first machine uses 230 kW of power at 0.85 power factor lagging. The second machine uses 95 kVA at 0.882 power factor leading. The lightening load consumes..
3) What is the RMS voltage of the source in a single loop series circuit if Irms = 1A-30° and Ztotal = 100 65° 4) What is the power dissipated by an electric heater with a resistance of 20? drawing a current waveform of i(t) = 10 sin(60t) Amps
Find the characteristics equation and the corresponding roots for the following ODEs and identify its case a) y" + 6Y' + 9y=0 b) 10y" + 18y' +5.6y=0 c) 10y" + 50y' + 65y =0 Slove the intial value problem a) problem 2a) with y(0)=2 and y'(0)=-5
a DC series machine ( 9.25 kW, 185 V, 1500 RPM) has Ra+Rsr = .3 ohms. The data for the magnetization curve are: Ia 0 10 20 30 40 50 60 Ea 10 50 106 156 184 200 208 Determine the terminal voltage at Ia = 20 amps, 40 amps and 60 amps.
Suppose instead that the current is only about 100,000 A. Then theoretically we should expect that only 100,000/(2*F)=0.52 moles of hydrogen is going through the system. However, due to leakage, crossover, and other losses the theoretical amount i..
A current of 5A flows through a resistor connected in series with choke coil. It is supplied with 250 V , 50Hz supply . If potential difference across resistor is 125 and across choke coil is 200 volt .
The transfer function for a circuit is H(s) = (s-1)/((s-1)^2 + 4). What is the natural response of the system? Is it stable?
Any causal signal x(t) having a Laplace transform with poles in the open-left s-plane (i.e., not including the jΩ axis) has, as we saw before, a region of convergence that includes the jΩ axis, and as such its Fourier transform can be found from i..
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