Ultimate Engineering Study Guide - Questions & Answers

Question 5 a) Explain how an induction motor can be simplified to an equivalent circuit. You must explain the importance of any quantities. (8 Marks) b) A 20kW, 4-pole induction motor is designed to operate from a 440V, 50Hz, three-phase supply, and when operating at full power on this supply it runs at 1470RPM. The motor efficiency is 90% under both conditions. (i) What supply frequency will be needed to make this motor run at 1270RPM while delivering a shaft power of 12.5kW? (7 Marks) (ii) If the motor were supplied from a sinusoidal variable frequency source, what voltage and current will need to be supplied to it when running at 1365RPM at 12.5kW if the power factor of the motor is 0.85? (10 Marks
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Three equiprobable messages m, m2, and m3 are to be transmitted over an AWGN channel with noise power spectral density No. The messages are 01 T 1 $(1): 01T otherwise $(1)=-$3(1) = T
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Task 1 IZZ Construct a SPWM controlled full bridge voltage source inverter circuit (VSI) using a suitable engineering software. Apply a DC voltage source, Vdc of 200V and a resistive load R of 10052. 111. Apply SPWM control method to operate all switches in the circuit. iv. Refer to Table1, select one data from the table, to set the modulation index M to 0.7 and the chopping ratio, N of 5 pulse. One set of data for one lab group. Run simulation to obtain the following results: An inverter output waveform. Vo. Number of pulses in half cycle of the waveform Inverter frequency. - Over modulated output waveform, Vo. (When M > 1) Discuss and analyze the obtained results. A VI.
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. A 3-phase Wye-Delta Connected source to load system has the following particulars: Load impedance 5+j4 ohms per phase in delta connected, 460 volts line to line, 60 hz mains: Calculate the following: a. Voltage per phase b. Voltage line-line c. current per phase and current line to line.
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5. For an ideal 2-winding transformer, an impedance 22 comecled across winding 2 (secondary) is referred to winding 1 (primary) by multiplying Z2 by [5 points] (a) The turns ratio (N1/N2) (b) The square of the turns ratio, i.e., (N1/N2) (c) The cubed turns ratio, i.e., (N1/N2)
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Design a series RLC bandpass filter. The center frequency of the filter is 12 kHz, and the quality factor is 4. Use a 7 uF capacitor. (Show your circuit) a) Specify the values of R and L. b) What is the lower cutoff frequency in kilohertz? c) What is the upper cutoff frequency in kilohertz? d) What is the bandwidth of the filter in kilohertz?
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Score II. Fill the blank (Each 1 point, total 10 points) 1. AC motors have two types: and 2. Asynchronous motors are divided into two categories according to the rotor structure: and current, 3. The current that generates the magnetic flux is called_ and the corresponding coil is called coil (winding). 4. The rated values of the are mainly and transforme
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A warning circuit that produces three outputs through a buzzer, BUT do not use components such as Arduino, servo motor, soil mosture sensor. It should be simple easy to understand and working1. Buzzer Off Plant needs no water2. Buzzer On- Plant needs water but not urgently3. Buzzer Beeping- Plant needs water urgently
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A state space model is given. In this problem you can use Matlab and Simulink. * = [_2_ _ ] x + [] y = [30]x + Ou a) Find the transfer function Y(s)/U(s) for the system. b) Check that the system is controllable. We want the system to have dominant poles in s= -5 + j5 so that the characteristic polynomial ac(s) = s + 10s + 50. What settling time and overshoot will the step response have with this pole placement? Find the feedback vector K so that you get the pole position in c). Draw the step response of the system with the K-values in d). c) d) e)
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A 23.0 mm diameter bolt is used to fasten two timber as shown in the figure. The nut is tightened to cause a tensile load of 30.1 kN in the bolt. Determine the required outside diameter (mm) of the washer if the washer hole has a radius of 1.5 mm greater than the bolt. Bearing stress is limited to 6.1 Mpa.
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Question I: 1. The fixed-value components of a Hay Bridge are R2 = 622, and C1 = 2uF. At balance R1 = 1692 and R3 = 1192. The supply frequency is 50 Hz. a) Calculate the value of the unknown impedance? b) Calculate the factor? c) What is the advantage of this bridge? 2. The value of the variable resistance of the approximate method for measuring capacitor is R = 8012 #1%. The voltage across the variable resistance and the capacitor are 20V + 4% and 30V + 3%. a. Find the capacitance value if the supply frequency is 60Hz + 3 %? b. Calculate and AC AC
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Using a D-MOSFET, design an amplifier for which:1. The magnitude of VGS is 1/4 of the magnitude of the choke voltage (VP).2. The ac voltage gain is exactly 17 dB.Assume that: |VDD| = 40V IDSS = 12mA |VGS(off)| = 3.3V A load RL = 40 k is capacitively connected to the output.
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estion 2 1 point Design a combinational logic design (using 3 inputs (x,y.z) and 1 output (F)) to give active high (1) output if the number of zeros is greater than the number of ones in the input. OA.xy+yz+xz OBF-xy +xz+y2 COCF=z OD.F-r & Moving to the next question prevents changes to this answer. Questio
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Choose one answer. A system with input r(t) and output y(t) is described by y (t) + y(y) = x(t) This system is 2 1) over-damped 2) under-damped 3) critically damped 4) undamped Choose one answer. What is the linear differential equation with constant coefficients that represent. the relation between the input r(t) and y(t) of the LTI system whose impulse response h(t)=e-2t + et 3 x(t) h(t) = -1 3 e-2t +-e y(t) 1) "" +3'(1)+2(t) = x(t) 2) yy'(t) + 2y(t) = x(t) 3) x +w (1) 2y(t) = x(t) Let the LTI system y(t) This system is 1) stable and under-damped 2) stable and critically-damped. 3) stable and over-damped 4) unstable Choose one answer. x(t) H(s) 32+5+16
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Given a system whose input-output relation is described by n+m 2) y[n] = > a[k], which of the following statements is NOT true? k=n-m a) It is causal if m=0 b) It is causal if m >0 c) It is a linear system d) It is a time-invariant system e) It is a stable system 3) Given a system whose input-output relation is described by y(t) = cos[x(t)], which of the following is NOT true? a) It is a linear system b) It is a causal system c) It is a stable system d) It is a time-invariant system e) It is a nonlinear system
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The wind turbine coefficient of performance Cp is a function ofa) tip speed ratiob) blade pitch anglec) wind speedd) a and be) b and c
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Design and implement a measurement system which is a low cost system to determine the cleanness of water.Please provide1. System specifications2. Engineering considerations for the measurement solution (sensor, actuator, etc.) including cost, installation standards, sustainability/ societal/ethical factors, etc.3. Mathematical calculation/simulation of the signal conditioning circuit and explain how it improves the output signal4. Block diagram and/or photo of the developed measurement system5. Results of testing that simulates the measurement scenario
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1. An asynchronous motor with a rated power of 15 kW, power factor of 0.5 and efficiency of 0.8, so its input electric power is ( ). (A) 18.75 (B) 14 (C) 30 (D) 28 2. If the excitation current of the DC motor is equal to the armature current, this motor is called the () motor. (A) separately excited (B) shunt (C) series (D) compound 3. When the DC motor is reversely connected to the brake, the string resistance in the armature circuit is (). (A) Limiting the braking current (C) Shortening the braking time (B) Increasing the braking torque (D) Extending the braking time 4. When the DC motor is in equilibrium, the magnitude of the armature current depends on (). (A) The magnitude of the armature voltage (B) The magnitude of the load torque (C) The magnitude of the field current (D) The magnitude of the excitation voltage 5. The direction of rotation of the rotating magnetic field of an asynchronous motor depends on ().
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QUESTION 8 2 points Save Answer If a magnet with a Field of 53.7 uWb (micro-waber) is identified in an area of 77.4 m2, calculate the magnetic flux, B. QUESTION 10 2 points Save Answer A three-phase induction motor is rated at 6 hp, 1608 rpm, with a line-to-line voltage of 204 V rms. Find the output torque *Hint 1hp = 746Watts, round answer to 2 decimal place at the end.
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Mr. Platinum's pumping system at Kagera comprises two water storage tanks. The reserve tank is located in the ground floor and the supply tank on the yopfloor. An optimum starting and high running performance capacitor type single phase induction motor is used as a water pumpwith several level sensors to augomate water pumping system. Design an automatic water pumping system comprising the the following features.- Typical layout of the water pumping system- Power and control circuit diagrams- Relevant warning signal indicators- safe protection devicesNOTE: Only one neutral terminal is available in the motor terminal block.
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Question: Calculate the phase crossover frequency for a system whose open-loop transfer function is 5 G(s) = s(s + 4)(8 + 10) You may use a computational engine to help solve and simplify polynomials. You must not use graphical methods for obtaining the phase crossover frequency and should solve for the phase crossover frequency algebraically.
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: Vi 2. Design a BPSK signal for a bandwidth of 0.5 kHz. a. Explain how you are able to obtain the correct bandwidth. b. What is the frequency value of the third null on the right side of the main lobe? C. How this is related to the bit rate.
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* In a shut configured DC motor has armature resistance of a52 and KEC(3) = 0.04. A typical mid range load, we found VA= 125, IA = 8A, It = 1.2A. Find the speed of motor * A four-pole motor has rated voltage of 230 V AC at 50Hz. At what RPM motor should run to maintain slip of 3% of synchronous speado
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Sketch the root locus of the unity feedback control systems whose forward transfer functions are: K(S+12) a. G(s) = S(S2+16S+100) K b. G(s) = c. G(s) = (S+5)(S2+45+7) K(s+45+5) S2(S+1)(S+3) K(S+12) S(S2+2S+2)(S2 +6S+10) d. G(s) =
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