Engineering

1. Solve the differential equation: dy 2 d 2 dy + 2y = 2e-4t dt dt dy with initial conditions y = 0, = 1 at t = 0. dt HINT: You will need to use partial fraction expansion.
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Let f(x) = x + x for x = [0,1]. What coefficients of the Fourier Series off are zero? Which ones are non-zero? Why? 2) Calculate Fourier Series for the function f(x), defined on [-2, 2], where -1, -2x 0, f(x) = { 2, 0 < x 2.
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Question 1 a) What is the pH of the resultant solution of a mixture of 0.1M of 25mL CH3COOH and 0.06M of 20 mL Ca(OH)2? The product from this mixture is a salt and the Kb of CH3COO-is 5.6 x10-1 [8 marks] b) There are some salts available in a chemistry lab, some of them are insoluble or less soluble in water. Among those salts is Pb(OH)2. What is the concentration of Pb(OH)2 in g/L dissolved in water, if the Ksp for this compound is 4.1 x 10-15 ? (Show clear step by step calculation processes) [6 marks] c) What is the pH of a buffer solution prepared from adding 60.0 mL of 0.36 M ammonium chloride (NH4CI) solution to 50.0 mL of 0.54 M ammonia (NH3) solution? (Kb for NH3 is 1.8 x 10-5). (Show your calculation in a clear step by step method)
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Develop the planning necessary for constructing a class that implements a Bag ADT in Java. Your program will store corresponding items for an On-Line Food Delivery Service. Specifically, your program should consider an item's name and price and manage the customer's shopping cart. The following are example values your class will be using for data:Customer Number = 1;item_Name="Can of Soup";Price = $4.00;After selecting your values for data, what are the required operations that must be used to create the Bag Interface? Your deliverable will consist of the following: Pseudocode for your proposed program Flowchart of the operations of adding items to the shopping cart and removing items from the cart.
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Construct npda that accept the following context-free grammars: (a) SaAB | bBB A aA | bB | b B b (b) SABb | alb A aaA | Ba B bb
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True or False: The following general transfer function has equal poles and zeros: (1-pc)(z-Zc) G(z) Zc < Pc (1-Zc)(z-Pc) =
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Explain the differences between salient-pole and cylindrical rotor synchronous machines in terms of reactance and maximum power transfer values. A 125 MVA 11 kV three phase 50 Hz synchronous generator has a synchronous reactance of 1.33 p.u. The generator achieves rated open circuit voltage at a field current of 325 A. The generator is connected to a network with an equivalent line-line voltage of 11 kV and an equivalent impedance of 0.17 pu on the generator base. The generator is loaded to a real power of 110 MW. b- Find the generated voltage Eaf in p.u. such that the network is operating at unity power factor at the external network equivalent voltage. Find the corresponding field current, the generator terminal voltage and power factor. C- Assume that the generator is operating at its rated terminal voltage. Find the generated voltage Eaf in p.u., the corresponding field current, the generator terminal current and power factor. [5 Points] [10 Points] [10 Points]
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Two glasses contain 50 g of water at 90 C and 100 g of water at 5 C. The two are mixed together in a third glass, which is isolated, so that no heat is lost. What is the final temperature of the water in the third glass? The specific heat of water is 4.184 J/g C. h 6 St
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The ROC ofX(z)isa
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A DFIG supplies a step-up transformer of j0.1 pu impedance & thence a transmission system of impedance j0.12 p.u. Assume beyond this is an infinite bus. The DFIG supplies rated power at unity PF into the infinite bus. The DFIG has an equivalent reactance Xeq of 0.8 per unit. All impedances on 100 MVA power base, 3-phase. Calculate direct and quadrature current components Ip and Iq, and internal voltage Eq.
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Scope Creep: beneficial or disadventageous?
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A resistance of 100k ohms is connected in series with a 50microfarad capacitor. If the combination is suddenly connected across a 400VACrms source, Determine the current one second after the switch is closed. Also find the value of time constant.
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b) Evaluate with aid of a diagram, the movement of a proportional solenoid in which a force is produced in relation to the current passing through the coil.
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Analyze x[n]XDT[k] = {2,3,4,-3j; using the decimation in Frequency-FFT (DIF-FFT) approach. (14 marks)
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Questions for Experim 1. In this experiment the dc output voltage from the capacitor-input filter was ap- proximately equal to: (e)rms primary 6. Briefly explain how a capacitor-input filter works.
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The timing diagram below is for a button press synchronizer that synchronizes a button press to a clock signal. The circuit has two inputs, 5 and the clock, and one output X. When the button is pressed (S-1) the output X will be ON (X=1) for only one cycle and it will not be ON again unless S=0. Design the button press synchronizer circuit using D flip-flops. S X Clk cycle1 cycle2 cycle3 cycle4 X (Note: Don't leave any cell without selecting either 1 or 0 in the truth table and K map.) Present State Next state Output SACA+ C+ X 00 001 0 1 0 # # # 0 1 1 100 101 1 1 0 1 1 1 D= # Ind AC 00 01 11 10 De= . AC 00 01 |11 40 10 X= AC Clk S # # 0 1 0 # 10 00 : 01 11 # 10 b # = 1 # = # 1 #
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haft by the Toad! 523. A three-phase Y-connected synchronous generator is rated 120 MVA, 13.2 kV, 0.8 PF lagging, and 60 Hz. Its synchronous reactance is 0.9 , and its resistance may be ignored. (a) What is its voltage regulation? (b) What would the voltage and apparent power rating of this generator be if it were operated at 50 Hz with the same armature and field losses as it had at 60 Hz? (c) What would the voltage regulation of the generator be at 50 Hz? 5-24. Two identical 600 14 104
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4. A shunt de generator, its rated power PN-9kW, rated voltage UN-115V, rated speed nN=1450r/min, armature resistance Ra=0.150, when the generator turning at rated operation state, the total resistance of the field circuit R= 332, the core loss is 410W, the mechanical loss is 101W, the stray loss is taken by 0.5 percent of rated power. Calculate the following: (1) The induced torque of the generator? (4 points) (2) The efficiency of the generator turning at rated operation state? (4 points)
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The maximum deviation of an FM carrier with a 2.5-kHz signal is 4 kHz. What is the deviation ratio?
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Question 1 A 25kW, 250V dc shunt machine has armature and field resistances of 0.069 and 100respectfully. The machine is first operated as a generator then as a motor. Determine: a. the generated emf when operated as a generator delivering 25kW output b. the power developed when operated as a generator delivering 25kW output c. the back emf when operated as a motor drawing 25kW input power d. the power developed when operated as a motor drawing 25kW input power
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A solution made up with calcium carbonate is initially supersaturated with Ca2+ and CO3 2- ions, such that the concentrations of each are both 1.35 103 M. [ Ca2+ ] [ CO3 2-]= 10^-8.34. When equilibrium is finally reached, what is the final concentration of calcium? (Use the pKs for aragonite.)
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Find solutions for your homeworkFind solutions for your homeworkengineeringelectrical engineeringelectrical engineering questions and answersgive correct answer in 10 mins i will give thumb upThis problem has been solved!You'll get a detailed solution from a subject matter expert that helps you learn core concepts.See AnswerQuestion: Give Correct Answer In 10 Mins I Will Give Thumb Up8. A sine signal with frequency of about 60 MHz and amplitude 1 V is sampled by a digital oscilloscope which hasa pass bandGive correct answer in 10 mins i will give thumb upShow transcribed image textExpert Answer100% OptiView the full answeranswer image blurTranscribed image text: 8. A sine signal with frequency of about 60 MHz and amplitude 1 V is sampled by a digital oscilloscope which has a pass band of B = 60 MHz and a sampler working at the frequency of 1 GHz. The oscilloscope employs a sinc reconstruction filter and shows interpolated lines on the screen. The acquired signal shown on the screen is: (a) A sine-like signal with a frequency of about 60 MHz and amplitude 1 V (b) A sine-like signal with a frequency of about 60 MHz and amplitude of about 0.7 V (c) A square-like signal with a frequency rather different from 60 MHz, and amplitude 1 V (d) A square-like signal with a frequency rather different from 60 MHz, and amplitude 0.7 V
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Calculation of AU Using American Engineering Units Saturated liquid water is cooled from 80F to 40F still saturated. What are A, AU, A, AP, and A?
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20. Write a few notes about the following transducers 1. Thermister, 2. LVDT 3. Piezo-electric 21. A thermistor whose constant -2500K, and the resistance at 20C in 1000 , is used for temperature measurement and the resistance measurement is 2500 2. Determine the temperature measured. 22. The resistance of a thermistor is 850 T 55 C and 4.5 k at freezing point. Calculate the characteristic constants (A, B) for the thermistor and variations in resistance between 30 C to 100 C. www
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