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The capacitance of a capacitor with a dielectric of air is 1200 µF. When a dielectric is inserted between the plates, the capacitance increases to 0.006 µF. Of what material is the dielectric made?
Given a sinusoid v1(t) whose phasor isV1 = -3 + j4 V, use phasor phasor method to find the voltage v2(t) that leadsv1(t) by 90 degrees and has an amplitude of 10V.
Calculate the L and C values of an L network that is to match a 9 ohm transistor power amplifier to a 75 ohm antenna at 122 MHZ.
CdS photodetector is irradiated by light with wave-length of 450nm and intensity of 30Wm^-2. If the band gap of CdS is 2.4 eV and all electron-hole pairs are extracted without recombination. What is current density of this photodetector
A 9-V flashlight battery has a rating of 1.8kWh. If the bulb draws a current of 100mA when lit; determine the following: a)For how long with the flashlight provide illumination b)How much energy in joules is contained in the battery
a. Neglecting resistance, determine the synchronous, transient and sub-transient reactances. b.If the machine is delivering 1.0 p.u. current at 0.8 power factor lagging at the rated terminal voltage when the short circuit is applied.
1. Calculate the Fourier transform of f(t)=5 sinc ([t-0.2]/2), and graph the magnitude and phase as function of f. 2. A military satellite uses 10 GHz for the downlink frequency. The distance to the satellite is approximately 36000 km.
What is the smallest integer number of time constants required for an exponential to decay to less than 10 percent of its initial value what percentage of its initial value is it at this time
Resistance of Headlights, A 24-volt automotive battery is connected to two headlights, such that the two loads are in parallel
compute the minimum required smoothing capacitor.
A sinusoidal signal x(t)=cos(100πt) is sampled at 80Hz and then reconstructed using a perfect lowpass filter with bandwidth 40 Hz. what is the equation of reconstructed signal and its frequency.
calculate the convolution (x1[x]*x2[k]) for the following pairs of sequences: a-) x1[k]=u[k+3]-u[k-2] and x2[k]=u[k+5]-u[k-4] b-) x1[k]=0.5^k u[k] and x2[k]=cos Pi*k u[-k]
Consider the signal x (t) = 10+ 20 cos (100*2 t + 4) + 10 cos (250*2 t ) A. Using Euler's relation, the signal x(t) defined by the above equation can be expressed as a sum of complex exponentials in the form X(t) = x0 + Re{k=1N Xkejk2fot}
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