Ultimate Engineering Study Guide - Questions & Answers

An unbalanced, 30, 4-wire, Y-connected load is connected to 380 V symmetrical supply. (a) Draw the phasor diagram and calculate the readings on the 3-wattmeters if a wattmeter is connected in each line of the load. Use Eon as reference with a positive phase sequence. The phase impedances are the following: Za = 45.5 L 36.6 Zo = 25.5 L-45.5 Zc = 36.5 L 25.5 [18] (b) Calculate the total wattmeter's reading [2]
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Design a low pass filter using a parallel RLC circuit with the given transfer function and km = 1000. 51,620,410.4 $2 + 10,160.749s +51,620,410.4 H(S)
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Considering where pipelines and utilities can be located and their impact on the overall look in the subdivision are factors of ?
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Larger micro-hydro systems may be used as a source of ac power that is fed directly into utility lines using conventional synchronous generators and grid interfaces. 44 ENG O
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describe Load-Following and Cycle Charging for the Hybrid System.
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An unbalanced, 30, 4-wire, Y-connected load is connected to 380 V symmetrical supply. (a) Draw the phasor diagram and calculate the readings on the 3-wattmeters if a wattmeter is connected in each line of the load. Use Eon as reference with a positive phase sequence. The phase impedances are the following: Za = 45.5 L 36.6 Zo = 25.5 L-45.5 Zc = 36.5 L 25.52 [18] (b) Calculate the total wattmeter's reading [2] Question 2 A 3-0, 4-wire, symmetrical supply with a phase sequence of abc supplies an unbalanced, Y-connected load of the following impedances: Za = 21.4 L 54.30 Zp = 19.7 L 41.6 Zc =20.9 L 37.8 An analysis of currents flowing in the direction of the load in line c shows that the positive and negative phase sequence currents are 24.6 L-42 A and 21.9 L 102 A. The current flowing in the neutral towards the star point of the supply is 44.8 L 36 A (a) Calculate the current in each line [8] (b) Calculate the line voltage in the system [12]
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Consider a system with closed-loop transfer function. By using a Routh-Hurwitz stability criterion, determine K in order to make the system to operate in a stable condition. K H(s) = s(s + s + 1)(s+ 2) + K
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Consider a process technology for which Lmin-0.5 um, tox=10 nm, un=500 cm2/V.s, and V0.7 V. (a) Find Cox and k'n. (b) For a MOSFET with W/L =10 um/l um, calculate the values of VGS needed to operate the transistor in the saturation region with a DC Ip = 100 u A. (c) For the device in (b), find the values of Vas required to cause the device to operate as a 1k0 resistor for very small vps. (2pts) F/m2 and k'n= UA/V2 a) Cox = b) Vos= c) VGs= V
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What is the phase angle of a voltage source described as v(t) = 15.1 cos (721 t - 24) mV? Please enter your answer in degrees (), with 3 significant figures. 1 points Save Answer
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Calculate the Assume one motor is connected to RB4, a program is design to run this motor by 80% duty cycle. Crystal frequency is 20 MHz. Illustrate the pulse generated complete with all the labels.
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Determine whether the following system with input x[n] and output y[n], is linear or not: y[n] =3?[n] +2x[n 3 Determine whether the following system with input x[n] and output y[n], is time-invariant or not. n y[n] = *[k] k=18
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Design an arithmetic circuit with one variable S and Two n-bit data input A&B the circuit generates the following Four arithmetic operations in conjunction with the input carry Cin. Draw the logic diagram for the first two stages logic. S Cin=0 0 D=A+B(ADD) Cin=1 D=A+B(increment) D=A+B+1(Subtract) 1 D-A-B(decrement)
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Construct a full-subtractor logic circuit using only NAND-gates? Using Electronic Workbench.
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Write a MATLAB script to plot the electric field distribution of the lowest three TE modes in a rectangular waveguide of dimensions x = a, and y = b. Hints: use the command "quiver." The choice of a and bis arbitrary as long as the frequencies are such that the modes will exist. Include the code and the plots.
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Design a simple matching network of your choice to match a 73 ohm load to a 50 ohm transmission line at 100 MHz. Assume that you can use lumped elements.
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A linear network has a current input i(t) = 7.5 sin(10t + 120) A and a voltage output Vout(t) = 120 cos(10t + 75) V. Select the correct complex representation of the impedance as well as the correct phasor form of impedance for this circuit. O complex form = 31.06 +j115.91 2 Ophasor form = 16/45 Complex form = 11.314 +j11.314 Ophasor form = 120/75 Ophasor form = 7.5/30 O Complex form = 11.314 - j11.314 complex form = 3.75 - j6.49
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Assume a single-stage superheterodyne is used to receive a 32 MHz signal. The frequencies of the local oscillator and intermediate frequency amplifier are 33 MHz and 1 MHz, respectively, (i) Explain why this choice of superheterodyne frequencies is not ideal for this problem (ii) Elaborate two better solutions for this problem.
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Using JK flip-flops to design a counter that counts in the periodic sequence 0, 1, 2, 6, 5, 0, ...
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Explain PAM-TDM transmission with complete transmitter and receiver block diagram and also discuss the bandwidth of transmission. b. Explain the technique to generate and detect flat-top PAM signal with block diagram and mathematical analysis. Also discuss aperture effect distortion and steps to overcome it.
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Determine the function of a LTI discrete-time system if its impulse response is h[n] = 0.58[n] +0.58[n 1]. Determine the function of a LTI continuous-time system if its impulse response is h(t) = 8(t) + 6(t 1). Determine the function of a LTI continuous-time system if its impulse response is h(t) = 0.1 [u(t) - u(t-10)].
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A delta 3-phase equilateral transmission line has a total corona losses of 53,000W at 106,000V and a power loss of 98,000W at 110,900 KV.Determine:a. The disruptive critical voltage between the lines.b. Corona losses at 113KV.
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a. Using mathematical analysis, derive NBFM and WBFM expression from the general expression of FM signal, show the spectral diagram and evaluate the bandwidth of transmission. b. Explain the direct method of generation of FM signal with neat circuit diagram and mathematical analysis. Compare such method with indirect method in terms of cost, complexity and stability.
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A PCM communication system samples each of two received signals with a 16-bit analog-to-digital converter at 64.1 kb/s. a input determine the output (i) Given full-scale sinusoid signal-to-quantizing noise ratio. (ii) The bit stream of digitized data is augmented by the addition of error-correcting bits and control bit fields. These additional bits represent 100 percent overhead. Determine the output bit rate of the PCM system.
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Evaluate the figure of merit of synchronous detection method to demodulate DSB-SC signal assuming white Gaussian noise in the input of receiver. b. An audio signal of 4KHz bandwidth is to be transmitted through a channel that introduces 30dB loss and white noise of PSD 10-9 W/Hz. Calculate required minimum transmitter power if the message is sent by DSB-SC modulation.
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