Challenging Engineering Problems with Detailed Answers

(a) A logic circuit is designed for controlling the lift doors and they should close (Y) if: (i) the master switch (W) is on AND either (ii) a call (X) is received from any other floor, OR (iii) the doors (Y) have been open for more than 10 seconds, OR (iv) the selector push within the lift (Z) is pressed for another floor. Devise a logic circuit to meet these requirements. (b) Use logic circuit derived in part (a) and provide the 2-input NAND gate only implementation of the expression. Show necessary steps. (c) Use K-map to simplify the following Canonical SOP expression. F(A,B,C,D) = = mc m(0,2,4,5,6,7,8, 10, 13, 15)
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Develop a project with simulation data of a DC-DC converter: Boost a) 12V output and output current between (1.5 A-3A) b) Load will be two 12 V lamps in parallel/Other equivalent loads correction criteria c) Simulation: Waveforms (input, conversion, output) of voltage and current in general. Empty and with load. d) Converter efficiency: no-load and with load e) Frequency must be specified f) Development of the high frequency transformer, if necessary g) Smallest size and smallest possible mass. Reduce the use of large transformers. Simulation can be done in Multisim.
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In an economic analysis of a particular system, the annual electricity cost (in year 0 dollars) is $600. What is the present value of the electricity costs over the period of the analysis if the inflation rate is 2%, the discount rate is 10% and the period is 5 years? [4 Marks] b. What is the present value of the electricity costs if the period under consideration in a above is extended to 10 years? [4 Marks] c. Why is the value for the 10-year period not equal to twice the value for the 5-year period?
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9. A shunt-connected de motor has the following rating: 100 hp, 750 V, 800 rpm. The field winding resistance is 150 2. The armature winding resistance is 0.25 12. At no-load condition, the motor draws 10 A from the supply and runs at 820 rm. Ignore the effects of armature reaction as well as the brush losses. (a) Draw the equivalent circuit of the machine, mark correct voltage polari- ties and current flow directions. (b) Calculate the field and armature currents at no-load condition. (c) Calculate the rotational loss of the motor in watts, in hp and also express it as a percentage of the rated power. (d) The load is increased and the motor draws 85 A from the supply. What will be the speed of rotation at this loaded condition? (e) Calculate the efficiency of the machine at the condition of part (d).
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EEEN 372 Power Electronics Homework II Design, Analysis and Simulation of a Boost Converter Part 1 - Analysis & Design Design a boost converter to produce an output voltage of 160 volts across a 400 ohm load resistor. The output voltage ripple must not exceed 2 percent. The input dc supply is XX V. Design for continuous inductor current. Specify the following; Deadline is Midterm. a- Duty Ratio b- The switching frequency, C- Values of the inductor and capacitor, d- The peak voltage rating of each device, and e- The rms current in the inductor and capacitor. f- Finally add rc=2 ohm in series with the capacitor and calculate the change in the ripple voltage ? Assume ideal components.
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Natural Heaith is a small American pharmaceutical firm that operates a large organic medicinal herbs plantation in Colombia Where labor is cheap because unemployment is very high. The average wage of a non-skilled worker is $1/day in Colombia and $50/ day in America. Natural Health is paying the workers only $0.58 /day (from sunrise to sunset) to save more money. Workers are young men from nearby ( 1 hour away if you walk) village Mivaryowho are the only wage earners in their familiesand their work involvescaring and harvesting herbs. There are no serious health and safety problems in the plantation. Nafural Health produces a natural medicine to treat a potentialy fatal form of malaria that effects big petcentage of the population inColombia. Naturaw Heathenarkets this medicine internationally with very good peofit and sets it to the Colomibian Ministry of Health with no profit so that malaria can be terminated in Columbia. Nafural liealthis management required the workers to leove Mivaryoand move to the prefabricated houses within the plantation. The manegement beleve that the "new village" is more comfortable and functional and that the young workers and their families should be educated to apgreciare functionality. Besides the woekers will not need to walk to work and waste 2 hours every day. The workers object, arguing that living in the "new village" will destroy their traditional way of life Which one of the following statements is not accurate for this case. Select one: A. Natual Health's management's decision is paternalistic B. Young workers and their families are ignorant to reject the offer. C.Villagers of Mivaryo are exploited D Natural Heath's managemen's decision is patemalistic EAatural Health's management is deciding on behalf of the workers
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10 function importfile(fileToRead1) %IMPORTFILE(FILETOREAD1) 20 123456 % Imports data from the specified file % FILETOREAD1: file to read % Auto-generated by MATLAB on 25-May-2022 18:31:21 7 8 % Import the file. 9 newDatal = load ('-mat', fileToRead1); 10 11 % Create new variables in the base workspace from those fields. 12 vars= fieldnames (newDatal); 13 for i=1:length (vars) 14 assignin('base', vars{i}, newDatal. (vars {i})); end 4 == 234SKA 15 16 17 Exponentially-D ying Oscillations Review Topics Sinewave Parameters y(t) = A sin(wt + 6) = Asin(2nf + o) A is the amplitude (half of the distance from low peak to high peak) w is the radian frequency measured in rad/s f is the number of cycles per second (Hertz): w = 2nf. o is the phase in radians T = 1/f is the period in sec. Introduction Course Goals Review Topics Harmonic Functions Exponentially-Decaying Oscillations Useful Identities cos(x + 6) = sin(x++) - sin(x+6)=sin(x++) Exercise: If y(t) = Asin(wt+o) is the position, obtain the velocity and the acceleration in terms of sin and sketch the three functions. y(t) = A sin(wt + o) = Asin(2nf + o) A is the amplitude (half of the distance from low peak to high peak) w is the radian frequency measured in rad/s f is the number of cycles per second (Hertz): w = 2nf. o is the phase in radians T= 1/f is the period in sec. Harmonic Functions Introduction Course Goals Review Topics Exponentially Decaying Oscillations Useful Identities cos(x + 6) = sin(x ++) - sin(x+6)=sin(x++) Exercise: If y(t) = A sin(wt+) is the position, obtain the velocity and the acceleration in terms of sin and sketch the three functions.
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List any two advantages of a company to implement Environmental Management Systems.
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The department recently purchased a new 3-phase lathe, and he is required to wire the power supply. The nameplate of the motor on the lathe indicated that it is delta connected with an equivalent impedance of (5 +j15) 2 per phase. The workshop has a balanced star connected supply and you measured the voltage in phase A to be 230 0 V. (a) Discuss three (3) advantage of using a three phase supply as opposed to a single phase supply (b) Draw a diagram showing a star-connected source supplying a delta-connected load. Show clearly labelled phase voltages, line voltages, phase currents and line currents. (c) If this balanced, star-connected source is connected to the delta-connected load, calculate: i) The phase voltages of the load ii) The phase currents in the load iii) The line currents iv) The total apparent power supplied
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(a) A logic circuit is designed for controlling the lift doors and they should close (Y) if: (i) the master switch (W) is on AND either (ii) a call (X) is received from any other floor, OR (iii) the doors (Y) have been open for more than 10 seconds, OR (iv) the selector push within the lift (Z) is pressed for another floor. Devise a logic circuit to meet these requirements. (8 marks) (b) Use logic circuit derived in part (a) and provide the 2-input NAND gate only implementation of the expression. Show necessary steps. (8 marks) (c) Use K-map to simplify the following Canonical SOP expression. F(A,B,C,D) = m(0,2,4,5,6,7,8,10,13,15) = (9 marks) (Total: 25 marks)
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Within the Discussion Board area, write 400-600 words that respond to the following questions with your thoughts, ideas, and comments. This will be the foundation for future discussions by your classmates. Be substantive and clear, and use examples to reinforce your ideas. Describe in detail the two-stage pipeline in the ARM Cortex MO+ processor. Be specific.
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aw the logic diagram of the ned in part (c)(111). (4 marks) (Total: 25 marks) Question 2 (a) A logic circuit is designed for controlling the lift doors and they should close (Y) if: (i) the master switch (W) is on AND either (ii) a call (X) is received from any other floor, OR (iii) the doors (Y) have been open for more than 10 seconds, OR (iv) the selector push within the lift (2) is pressed for another floor. (8 marks) Devise a logic circuit to meet these requirements. (b) Use logic circuit derived in part (a) and provide the 2-input NAND gate only implementation of the expression. Show necessary steps. (8 marks) (c) Use K-map to simplify the following Canonical SOP expression. = F(A,B,C,D) = m(0,2,4,5,6,7,8,10,13,15) (9 marks) (Total: 25 marks)
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Course INFORMATION SYSTEM AUDIT ANDCONTROL6. What are the five internal controlcomponents described in the COSO framework?
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Given the following code, org Ooh ; start at program location 0000h MainProgram Movf numb1,0 addwf numb2,0 movwf answ goto $end ;place 1st number in w register ;add 2nd number store in w reg ;store result ;trap program (jump same line) ;end of source program 1. What is the status of the C and Z flag if the following Hex numbers are given under numb1 and num2: a. Numb1 =9 F and numb2=61 b. Numb1 =82 and numb2 =22 [3] c. Numb1=67 and numb2 =99 [3] 2. Draw the add routine flowchart. [4] 3. List four oscillator modes and give the frequency range for each mode [4] 4. Show by means of a diagram how a crystal can be connected to the PIC to ensure oscillation. Show typical values. [4] 5. Show by means of a diagram how an external (manual) reset switch can be connected to the PIC microcontroller. [3] 6. Show by means of a diagram how an RC circuit can be connected to the PIC to ensure oscillation. Also show the recommended resistor and capacitor value ranges. [3] 7. Explain under which conditions an external power-on reset circuit connected to the master clear (MCLR) pin of the PIC16F877A, will be required. [3] 8. Explain what the Brown-Out Reset protection circuit of the PIC16F877A microcontroller is used for and describe how it operates. [5]
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vuusrage Next Page Page 3 Question 3 (20 points) 3. A GaAs pn junction laser diode is designed to operate at T 300K such that the diode current ID 100mA at a diode voltage of Vp = 0.55V. The ratio of electron current to total current is 0.70. The maximum current density is Jaar 50A/cm. You may assume D. = 200cm?/s, D, = 10cm/s, and Tho = Tpo = 500ns. Determine Na and N, required to design this laser diode (20 points).
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: (a) Convert the hexadecimal number (FAFA.B) 16 into decimal number. (b) Solve the following subtraction in 2's complement form and verify its decimal solution. 01100101 - 11101000 (c) Boolean expression is given as: A +B[AC + (B+C)D (1) Simplify the expression into its simplest Sum-of-Product(SOP) form. (ii) Draw the logic diagram of the expression obtained in part (c)(i). (iii) Provide the Canonical Product-of-Sum(POS) form. (iv) Draw the logic diagram of the expression obtained in part (c)(iii).
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Instead of getting the baseline power draw from the old lighting manufacturing data sheets, the baseline power draw is measured using power meter. Which M&V option best describe this?
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Which of the following best describes a service lateral?Select one:a. The point of connection between the facilities of the serving utility and the premises wiring.b. The overhead conductors between the utility electric supply system and the service point.c. The underground conductors between the utility electric supply system and the service point.d. The service conductors between the terminals of the service equipment and a point.
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Electric field intensity xy + yx in an environment given + 10 load t1 (2,4, -8) T2 (-4,16,-8) to, y = xFind the work done during the transportation for 2 ways.This is a question from "electromagnetic field tradition".
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EMC Facilities is important to determine the EMI/EMC level of a particular electronic device in order to ensure that it will be able to operate in its intended environment without having EMC problem. a. An OATS is alternative EMC facilities as compare with TEM and GTEM cell. Discuss the disadvantages of the OATS as compare with Semi-Anechoic Chamber and Reverberation Chamber. (6 marks) b. Absorber is designed specifically for use in Full/Semi-Anechoic chamber. Describe the different type of absorbers.
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A cage induction machine itself: (a) Always absorbs reactive power (b) Supplies reactive power if over-excited (c) Neither consumes nor supplies reactive power (d) May provide reactive power under certain conditions (e) Neither of the above c27. The ratio of the rotor copper losses and mechanical power of a 3-phase induction machine having a slip sis: (a) (1-5): s (b) S: (1-5) () (1+5): (1-5) (d) Not slip dependent (e) 2:1 c28. The rotor field of a 3-phase induction motor having a synchronous speed ng and slip s rotates at: (a) The speed sns relative to the rotor direction of rotation (b) Synchronous speed relative to the stator (C) The same speed as the stator field so that torque can be produced (d) All the above are true (e) Neither of the above C29. The torque vs slip profile of a conventional induction motor at small slips in steady-state is: (a) Approximately linear (b) Slip independent (c) Proportional to 1/s (d) A square function (e) Neither of the above C30. A wound-rotor induction motor of negligible stator resistance has a total leakage reactance at line frequency, x, and a rotor resistance, R, all parameters being referred to the stator winding. What external resistance (referred to the stator) would need to be added in the rotor circuit to achieve the maximum starting torque? (a) x (b) X+R (C) X-R (d) R (e) Such operation is not possible.
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Imagine that three different inventors come up with three wind turbine designs with these claimed efficiencies: turbine A with 41%, turbine B with 59%, and turbine C with 67%.How do you quickly evaluate these claimed efficiencies? Explain the basis of your evaluation and that you think these values are realistic or not.
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You are asked to design a cyclic modulo-6 synchronous binary counter using J-K flip-flops. The counter starts at () and finishes at 5. (a) Construct the state diagram for the counter. (3 marks) (b) Construct the next-state table for the counter. (3 marks) (c) Construct the transition table for the J-K flip-flop. (3 marks) (d) Use K-map to determine the simplest logic functions for each stage of the counter. (9 marks) (e) Draw the logic circuit of the counter using J-K lip-flops and necessary logic gates. (7 marks) (Total: 25 marks)
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Sub:-Principles of Communication7. What are uniform quantization and non-uniform quantization? And explain the implementation method of non-uniform quantization. (6 points)
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