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a) Compute and plot the 128 point FFT of a 0.125Hz cosine wave:
1) Set t=0:1/16:80;
2) Set t=0:2/16:80;
Compare the differences in the FFT result. Explain why even though the inputs to both FFTs are the same cosine waves, the shapes of the FFTs are different.
determine the current through the capacitor, i_c(t) for time t greater than or equal to zero if the following statements apply. 1. Vc(t=0) = 5V 2. The switch is closed from t = - infinity to t = 0.2 seconds, when it opens.
A filter has the following characteristics: Attenuation is 0 dB from 0 Hz to 2.5 kHz. Phase angle decreases linearly with increasing frequency above 2.5 kHz. Above 5 kHz the filter has steadily increasing attenuation.
consider the back to back cascade of an ideal C to D and D to C converter. Both have the same sampling rate fs. Suppose that the signal being sampled is: x(t) = cos(324*pi*t - pi/4) + cos(80*pi*t - pi/4)
A sinusoidal voltage of peak value 169.9 is applied to a load Z=16-j9. a)What is the peak active power delivered to the load b) What is the value of the average active power delivered to the load
Describe the basic operation of the n-channel MOSFET, the relationship to VGS, VDS an IDS. This would include such things as accumulation, inversion, pinch-off point, etc. Which end is the drain
A.) We would like to use a series lumped element b to match this load. What is the length of the line where the normalized input impedance is z= 1-jb(d/\lambda). If the rfequency is 1GHz , find the value of the lumped element(C or L).
A 150kVA, 2080/208V, 60Hz, Y/Y connected, three-phase, step-down transformer consists of three identical single-phase transformers. Each transformer has the following parameter values: Rl = 0.45-ohm, Xl = 2.2-ohm , R2 = 4.5m-ohm
Two strands of infinitely long current rights carry currents of equal magnitude. Find the magnetic field produced by the two filaments at the midpoint between the two strands. Compare this result if the currents: a) have the same direction
Design a series resonant circuit to have a bandwidth of 400 Hz using a coil with a Ql of 20 and a resistance of 2 ohm. Find the values of L and C and the cutoff frequencies.
The excitation branch impedances are given referred to the high-voltage side of the transformer. a) Find the equivalent circuit of this transformer referred to the high-voltage side.
A P=900W electric motor with pf=0.82 lagging is connected to a 240 Vrms 60 hertz source. a) Draw an equivalent circuit showing impedance and phasor values for Vs, R and X. b) Find an Xc value to put in parallel with the motor which corrects the pf to..
The program is to input the number character-by-character and then assemble them together so that the original number is put into a floating point variable and displayed back to the monitor.
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