Ultimate Engineering Study Guide - Questions & Answers

The binary numbers A = 1100 and B = 1001 are applied to the inputs of a comparator. What are the output levels? CAB= 1, AB=0, A< B = 1, A = B = 1 AB= 1, A< B = 0, A
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Low values of Fill Factor of PV cells represent, select one of the followinga) low irradianceb) higher losses in parasitic resistancesc) low open circuit voltage
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QUESTION 1 Design a logic circuit that has three inputs, A, B and C, and whose output will be HIGH only when a majority of the inputs are LOW and list the values in a truth table. Then, implement the circuit using all NAND gates. [6 marks] QUESTION 2 Given a Boolean expression of F = AB + BC + ACD. Consider A is the most significant bit (MSB). (a) Implement the Boolean expression using 4-to-1 Multiplexer. Choose A and B as the selectors. Sketch the final circuit. [7 marks] (b) Implement the Boolean expression using 8-to-1 Multiplexer. Choose A, B and C as the selectors. Sketch the final circuit. [5 marks]
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Considering the typical input and output resistances, which of the following BJT amplifier types is well suited to be used as a voltage amplifier ? Select one: O a. Common-collector O b. Common-base O c. All of these X O d. None of these O e. Common-emitter Clear my choice Check
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Q3. Sketch the waveform of 32-QAM system for transmitting following bit streams 1111111111111100000000000000011111111111,10000000 1 2 3 4 5 6 7 8 9 10 11 12
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Draw a circuit diagram to drive a relay using MBED. You need to use transistor, resistors and diode in correct order as discussed in the lab.
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electromotive force (Ef). (6) 3.2. Two synchronous generators need to be connected in parallel to supply a load of 10 MW. The first generator supplies three times the amount of the second generator. If the load is supplied at 50 Hz and both generators have a power drooping slope of 1.25 MW per Hz. a. Determine the set-point frequency of the first generator Determine the set-point frequency of the second generator. (4) (3) b.
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Figure 3 shows a 4 pole 3-phase squirrel cage induction motor with an output of 20 KW, wired in a Delta connected to a 400V 50Hz supply. If the motor operates at an efficiency of 85% and a power factor of 0.7 at a slip of 4%, Calculate: a The phase current in the motor stator windings.
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A certain unity negative feedback control system has the following forward path transfer function K G(s) = s(s+ 1)(s+4) The steady state error ess 2 rad for a velocity input of 2 rad/s. Find the constant velocity parameter and K.
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Consider an air conditioning (AC) unit. We program the AC as follows: On weekday (W = 1), during day time (D = 1), when room temperature is equal or above 80 F (H= 1), we set AC ON (F = 1); AC will automatically tum off (f = 0) when temperature is below 80 F (H = 0). On weekday (W = 1), during night time (D = 0), when room temperature is equal or above 72 F (L = 1), we set AC ON (F = 1); AC will automatically tum off (F = 0) when temperature is below 72 F (L = 0). On weekend (W = 0), during day time (D = 1), when room temperature is equal or above 78 F (H= 1), we set AC ON (F = 1); AC will automatically turn off (F = 0) when temperature is below 78 F (H = 0). On weekend (W = 0), during night time (D = 0), when room high temperature is equal or above 74 F (L = 1), we set AC ON (F = 1); AC will automatically turn off (F = 0) when temperature is below 74 F (L = 0). (We note that H has been set for different temperatures for weekday and weekend. This is fine by electronic memory, not to worry about it.) Do the following: (a) Convert above statements into a Truth table below. (3 pt.) (Use incremental sequence for casier grading.) (b) Write the logic expression. (3 pt.) (c) Simplify the logic expression to the simplest form. (2 pt.) (d) Draw logic circuit to implement the simplified logic expression. (2 pt.) Truth Table WDH
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(2) Short Answer Spend A balanced three-pload.com.com 100 MW power factor of 0.8, at a rated village of 108 V. Determiner.com and scoredine Spacitance which bed to the power for 0.95 . For at systems, given the series impediscesas 24-0.1.0.2, 0.25, determine the Y... mittance matrix of the system. 10:12
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Please sketch the high-frequency small-signal equivalent circuit of a MOStransistor. Assume that the body terminal is connected to the source. Identify (name) each parameterof the equivalent circuit. Also, write an expression for the small-signal gain vds/vgs(s) in terms of thesmall-signal parameters and the high-frequency cutoff frequency H. Clearly define H in terms ofthe resistance and capacitance parameters.Type or paste question here
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The AC currents of a star-connected 3-phase system a-b-c (as shown in Figure Q7) are measured. At a particular instant when the d-axis is making an angle = +40o with the a-winding.ia 23 A ; ib 5.2 A ; ic 28.2 AUse the Clarke-Park transformation to calculate id and iq. No constant to preserve conservation of power is to be added.
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4- Sketch principle 2 stages AC voltage testing set, and explain the function and the power rating of each stage. Why do we need to run the system at resonance conditions?
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QUESTION 3 [ 17 Marks] Assume that the static output characteristics y(x) of a medical sensor could be approximated by the nonlinear relation y = Qo + azx + a,x, where x is the input to the sensor. Table 1 contains the sample measurements of the output versus the input of the sensor. 3.1 Use the data available in Table 1 to identify the sensor parameter do, , az : [12] 3.2 Based on the estimated sensor parameters, estimate the output of the sensor for an input value x = 8. [5] bo 1.0 0.5 0.8 0.45 3 1.5 2.0 12.45 | 22.2 4.0 86.2 5.0 133.3 y -1.8 5.2.
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Problem 1. In this problem we aim to design an asynchronous counter that counts from 0 to 67. (a) Design a 4-bit ripple counter using D flip flops. You may denote the output tuple as (A3, A2, A1, A0). (b) Design a ripple counter that counts from 0 to and restarts at 0. Denote the output tuple as (B2, B1, Bo). (c) Explain how to make use of the above counters to construct a digital counter that counts from 0 to 67. (d) Simulate your design on OrCAD Lite. Submit both the schematic and the simulation output.
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1.) WORTH 30 POINTS In a 480 [V (line to line, rms)], 60 [Hz], 10 [kW] motor, test are carried out with the following results: Rphase-to-phase = 1.9 [2]. No-Load Test: applied voltages of 480 [V (line to line, rms)], la = 10.25 [A,rms], and Pno-load, 3-phase = 250 [W]. Blocked-Rotor Test: applied voltages of 100 [V (line to line, rms)], la = 42.0 [A,rms], and Pblocked, 3-phase = 5,250 [W]. A) Estimate the per phase Series Resistance, Rs. B) Estimate the per phase Series Resistance, R. c) Estimate the per phase magnetizing Induction, Lm- d) Estimate the per phase stator leakage Induction, Lis e) Estimate the per phase rotor leakage Induction, L.
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3. Design a FM modulator for B = 9.55. a. Calculate the bandwidth for 98% power. b. Show the spectrum identifying the bandwidth.
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17. (4pt.) Write the following values in engineering notation. (a) 0.00325V (b) 0.0000075412s (c) 0.1A (d) 16000002
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EXAMPLE 8.4 A single-phase 50 Hz transmission line has the following line oppstants-resistance 250; inductance 200mH; capacitance 1-44F. Calculate the sending-end voltage, current and power factor when the load at the receiving- end is 273A at 76-2kV with a power factor of 0-8 lagging, using (a) a nominal- circuit, and (b) a nominal-T circuit, to represent the line.
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An ideal digital differentiator is described by the system y[n]=(x[n+1]-x[n-1])-1/2(x[n+2]-x[n-2])+1/3(x[n+3-x[n-3])+.....a) is the system LTI?b) is it causal?c) prove it is not BIBO stabled) provide a bounded input x[n] that produces as unbounded output y[n]show all work
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.) WORTH 40 POINTS In a 2-pole, 480 [V (line to line, rms)], 60 [Hz], motor has the following per phase equivalent circuit parameters: R = 0.45 [2], Xs=0.7 [S], Xm= 30 [N], R= 0.2 [S2],X=0.22 [2]. This motor is supplied by its rated voltages, the rated torque is developed at the slip, s=2.85%. a) At the rated torque calculate the phase current. b) At the rated torque calculate the power factor. c) At the rated torque calculate the rotor power loss. d) At the rated torque calculate Pem.
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(10 marks) A 3-signal digital communication system, using S(:),,(), S, (1) given by S(O)=1 Osis1 S (1) = 2 OSISI S(t)=-1 Osis1 with P[S, ()=P[S, ()) = 0.45 and P[S, ()1=0.1 with N. = 0.2. a) (2 marks) Find the basis functions and signal-space representation b) (3 marks) Find the decision regions of the optimum detector. c) (5 marks) Find the overall error probability of the optimum receiver.
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onsider a single phase inverter with a DC bus voltage of 100. (a) Calculate the duty ratios required to synthesize a average DC voltage of 40 volts. (b) Calculate the duty ratios required to synthesize a average DC voltage of -62 volts. (c) Calculate the duty ratios required to synthesize a average AC voltage of v(t) = 45 sin(wt). i. Assume the output load current is 10 sin(wt 10). Calculate the average DC bus current. ii. What is the average power consumed by the load?
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