amaranthmuskrat836Lv1in Electrical Engineering·28 Nov 2020Problem 1 : (50 points)Considering the following continuous real signal x(t), 8 samples from the signal x(t) arecollected to form the discrete signal x[n]. The sampling rate of x(t) is 2400 samples persecond.1. Calculate the DFT X[m] of x[n] for 0 ≤ m < 4 where X[2] corresponds to thespectrum of x(t) at the frequency 1.2KHz.2. Calculate the DFT X[m] of x[n] for 0 ≤ m < 6 where X[2] corresponds to thespectrum of x(t) at the frequency 0.8KHz.3. Calculate the DFT X[m] of x[n] for 0 ≤ m < 8 where X[2] corresponds to thespectrum of x(t) at the frequency 0.6KHz.Recalculate the coecients x[n] in the three cases. Interpret your result.If you want to save the DFT coecients, how many coecients would you choose. Whichones ?
graygerbil301Lv1in Electrical Engineering·29 Sep 2020b) Figure Q1b shows an AM modulator. The audio input (I/P) is set at 300 mV amplitude and 1 kHz sine wave frequency. The carrier signal is set at to be 300 mV amplitude and 100 kHz sine wave frequency. i. Sketch the output at TP1 and TP2 by showing the phase different. [4 marks] ii. Analyse the circuit and write the expression for output at M1 and output of the modulator.
mauvepug262Lv1in Electrical Engineering·12 May 2020Consider a p+-p-n solar cell with light shining on the p+ side. Choose from the 4structures below the one that would make the best solar cell. For which range of wavelengths doesthis solar cell produce photocurrent? Explain why the 3 other structures are not an optimal choice fora solar cell.a) Structure 1: p+, p and n regions made of Sib) Structure 2: p+, p and n regions made of GaAsc) Structure 3: p+ region made of Al0.3Ga0.7As, p and n regions made of GaAsd) Structure 4: p+, p regions made of GaAs, n region made of Al0.3Ga0.7AsNote: Eg (AlxGa1-xAs) = 1.424 + 1.27x (for x < 0.4)
champagnescorpion992Lv1in Electrical Engineering·1 May 2020Figure 1 shows a network of resistors connected to a voltage source. As shown in the figure, thenetwork consists of 2 meshes and the values of all the resistors are given. In this question meshcurrent analysis is used to find the currents in all the resistors.(a) Use KVL to write two equations in terms of the two mesh currents, I1 and I2. Do not solvethem in this part. Note only the resistor R3 is shared by both meshes. (5)(b) Use the two equations derived in part (a) to solve for the mesh currents, I1 and I2. (5)(c) Find the currents in all five resistors by calculating the branch currents from the meshcurrents. (5)(d) Calculate the power dissipated in all five resistors and the power delivered by the source.Show that power is conserved. (5)(e) Find the Thevenin equivalent circuit (find Vt and Rt) between the two terminals V1 andground as shown in Figure 2. Hint – Find the open‐circuit voltage between V1 and ground andthe short circuit current from V1 to ground. (5)(f) If the value of R3 is varied while all the other components are the same as before, find thevalue of R3 which will maximize the power delivered to R3. What is the maximum powerdelivered to R3. (5)
astudentLv1in Electrical Engineering·15 May 2020Solve and Find:a) The complex power absorbed in the voltage source.b) The real power absorbed in the capacitor.c) The reactive power absorbed in the resistor in series with the -j800 capacitor.
plummole579Lv1in Electrical Engineering·27 Apr 2020What are the electrician schools and colleges in the US?
roseprairie-dog261Lv1in Electrical Engineering·2 Apr 2020The Federal Open Market Committee promotes price stability and economic growth through: (i) oversight of the financial services industry. (ii) management of the money supply. (iii) provision of direct services to consumers. (iv) supervision of regional banking operations.
roseduck180Lv1in Electrical Engineering·22 Feb 2020Which of the following statements are true about inflation? a) It occurs when the overall level of prices increases. b) Some prices may fall even when most others rise. c) Some prices affect consumers more than others. d) When in the 2-4% range, it can be a sign of a healthy economy.
indigoraven463Lv1in Electrical Engineering·25 Mar 2020Use the mesh-current method to find the power dissipated in the 15 ohm resistor in the circuit.
greensea-lion330Lv1in Electrical Engineering·23 Mar 2020The voltage across a 5 μF capacitor is known to be Vfort≥0 , where t is in seconds. Part B Find the power at the terminals of the capacitor when t = 185 μs . Part D Find the energy stored in the capacitor at t = 185 μs Part E Find the time when the maximum energy stored in the capacitor occurs. Part F Find the maximum energy stored in the capacitor
rubyimpala161Lv1in Electrical Engineering·20 Mar 2020Imagine that in part E8, you had placed the compass due East of the wire. Draw two vector diagrams of the magnetic field felt by this compass: One with the current OFF and one with the current ON. Each diagram should show the magnetic fields from any relevant sources as well as a vector indiacating the total magnetic field. For this problem, assume that the current flows upwards (in diagram it is out of page).
oliveimpala333Lv1in Electrical Engineering·29 Aug 2021Which of the following are analog quantities , and which are digital?
salmonsea-lion311Lv1in Electrical Engineering·6 Nov 2022An armature-controlled DC motor drives an AC generator with resistive-inductive load. Developa state-variable description of this system assuming that it has one input, voltage applied to themotor, and two outputs, current in the load and frequency of the voltage applied to the load