Electrical Engineering Questions and Answers March 14, 2019

1. A measurement of one of the lab's 5 ?F (nominal) capacitors with the impedance bridge (set on series-model at 1000 Hz) yielded a capacitance of C s = 4.98 ?F with a dissipation factor of D = 0.036. Obtain the parallel-model capacitance C p and the series-model resistance R s and the parallel-model resistance R p associated with this practical

R 889 C, 4.97 F RAL 3142 31, 5mH

A design model for a transmission-line tower is shown in the figure. Members 0-1, FG, OP, and NO are insulated cables: all other members are steel bars. For the loading shown, compute the forces in members Fi, FJ, Ej, EK, and ER. Use a combination of methods if desired.

H 60 4m4m4m4m4m4m K 25 KN 30 DR B EMQ P 5.4 m L S M 30 N 25 KN 60 6 m 6 m 6 m

In a p - n junction diode operating under certain reverse bias Vr , if Vr is increased to 3 Vr , what will be the impact on the following parameters?

current flows? 5 9 . What voltage is involved in a 1 . 4 4 - kW short circuit through a 0 . 1 0 0 - resistance?

Question 1 4 ( Mandatory ) ( 4 points ) The input combination that drives the output of a NOR gate S - R flip - flop to Q = 0 and ? b a r ( Q ) = 0 is S = 0 , R = 1 S = 1 , R = 1 S = 1 , R = 0 S = 0 , R = 0 Question 1 7 ( Mandatory ) ( 4 points ) The inputs on a 7 4 7 4 D flip - flop are S , R , D and clock. Which of these are asynchronous? only D

The given circuit implements a cascade configuration of a high pass and a low pass filter: Determine the half power frequency, \ ( f _ { B 1 } \ ) , transfer function for the high pass filter ( 5 ) Determine the half power frequency, \ ( f _ { B 2 } \ ) , and transfer function for the low pass filter ( 5 ) Determine the overall transfer function

Two inductors of self - inductance L 1 and L 2 are connected in parallel. The inductors are magnetically shielded from one another so that neither produces flux in the other. Show that the self - inductance of the combination is given by 1 L = 1 L 1 + 1 L 2 .

The Transfer Functions of the Plant and the Controller are as shown below: G ( s ) = s s 3 + 6 s 2 + 1 1 s + 6 , G c ( s ) = K P + K D s + K 1 s where K p , K i and K d are the Proportional, Integral and Derivative Controller gains. a . Model the above closed - loop system using Simulink. The output Scope block must display both the input and

Apparent power = 4 0 VA Power factor = 0 , 5

# 1 - Node - Voltage Method ( 2 5 pts ) Instructions: Using the node - voltage method, find the V 1 , V 2 node voltages.

( 1 0 p ) The zener diode regulator circuit shown in figure below. Assume a 1 2 V zener diode is used

( 8 points ) Matching. A few word explanations are required. IMPULSE RESPONSE 2 Frequency Response 1 Pole - Zero Diagram 1 Pole - Zero Diagram 2 Frequency Response 3 Framency Decnonea 4 Pole - Zero Diagram 3

Prove that the line current of a balanced delta - connect load is equal to the phase current multiplied by square root of 3 and lags it by 3 0 degrees

What is the capacitor value in this circuit? Question 1 2 Select one: a . 3 0 uf b . 1 uf c . 5 uf d . . 4 5 uf

Question 1 : What will be the output if we provide a 5 ( V ) DC input into a differentiator? ( a ) Zero ( b ) Linear function 5 t ( c ) 5 ( V ) D C output ( d ) None of the above Question 2 : What will be the output if we provide a 5 ( V ) DC input into an integrator? ( a ) Sine wave output ( b ) Square wave output ( c ) Linear output ( a line ) (

Older transformers may contain a cooling liquid that's a known carcinogen. The abbreviated name for this cooling material i A . ABD. B . PCB . C . TSR . D . FEP.

A 5 0 ( ) transmission line is connected to a load impedance Z L = 8 0 + j 6 0 ( ) [ Note: in textbook different [ : Z L = 6 0 + j 8 0 ( ) } . A double - stub tuner ( DST ) spaced an ( 1 8 ) apart ( think what if 3 8 , 7 1 6 , 6 , or any? ) is used to match the load to the line, as shown below. Find the required length of the short - circuited

A 1 Khz sinusoidal signal phase modulates a carrier signal with frequency of fc = 1 5 0 Mhz ( a ) obtain the expression for spectra of the PM signal if Ac = 1 and plot it ( b ) obtain the approximate bandwidth of this PM signal.

Please answer all parts fully. As soon as possible would be greatly appreciated. ( Will LIKE for full completion! )

Question 3 0 ( Mandatory ) ( 2 points ) Which Boolean equation results from this Karnaugh map? \ table [ [ , , C ] , [ ? b a r A b a r ( B ) , 1 , ] , [ A B , , 1 ] , [ A B , 1 , 1 ] , [ A ? b a r ( B ) , 1 , ] ] ( A B ) + ( ? b a r ( B ) C ) + ( ? b a r B b a r ( C ) ) ( A B ) + ( B C ) + ( ? b a r B b a r ( C ) ) ( A C ) + ( ? b a r A b a r ( B

draw the circuit diagram for Modify the Mod 4 Up counter a ) 2 MUX b ) 2 D Flip Flops c ) 1 Clock d ) 2 Output pins for the table e ) 8 input pins, 4 for each multiplexer. f ) Wiring as necessary ( hint: splitters are part of the wiring category )

7 . 2 7 At 2 GHz , the conductivity of meat is on the order of 1 ( S / m ) . When a material is placed inside a microwave oven and the field is activated, the presence of the electromagnetic fields in the conducting material causes energy dissipation in the material in the form of heat. ( a ) Develop an expression for the time - average power per

What is the critical frequency fc ? R = 1 kohm, C = 0 . 3 3 uF Group of answer choices 3 3 . 6 Hz 4 8 2 2 . 8 Hz 1 0 6 3 . 8 Hz 4 8 2 . 3 Hz

A signal x ( t ) with Fourier transform X ( jw ) undergoes impulse - train sampling to generate 5 0 0 0 7 T ( b ) X ( jw ) = 0 for lwl > 1 5 0 0 0 7 T ( c ) ( Jl . e { X ( jw ) } = 0 for lwl > 5 0 0 0 7 T ( d ) x ( t ) real and X ( jw ) = 0 for w > 5 0 0 0 7 T ( e ) x ( t ) real and X ( jw ) = 0 for w < - 1 5 0 0 0 7 T ( f ) X ( jw ) * X ( jw ) =

PHYSICS 2 4 1 / 2 6 1 LABORATORY PRACTICAL EXAM, 4 5 minutes There are 5 tasks listed below. After you have completed a task, write your answer in the space provided and raise your hand to have the TA check your result. Alternatively, if you have decided that you cannot setup the circuit, you may raise your hand and ask the TA to do the setup for

The value of which of the following types of power ( true , reactive, or apparent ) must be minimized in order for unity power factor to be approached?

( 1 ) What is the average power absorbed by the circuit in the dashed box? ( 2 ) What is the reactive power absorbed by the circuit in the dashed box?

Can you do it in simulink? Assignment: Find and plot as a figure the frequency spectrum of the reconstructed signal of the above experiment for the given period and pulse width. Use the time increment and the number of samples M = 2 5 6 . Which is better, uniform quantization or non - uniform quantization? and why? Submit your solutions and

I need the matlab code for 6 . 2 An algorithm for generating a Gaussian random variable from two independent uniform random variables is easily derived. ( a ) Let and be two statistically independent random numbers uniformly distributed in [ 0 , 1 ] . Show that the following transformation generates two statistically independent Gaussian random

2 4 0 . 2 1 ( B ) ( 1 ) requires that tap conductors, where not over 3 meters ( 1 0 feet ) long, have an ampacity that _ _ _ . I. will be able to carry the current drawn by the load II . is at least 1 / 3 the rating of the overcurrent device protecting the feeder conductors III. is at least 1 / 1 0 the rating of the overcurrent device protecting

For the third - order servo system G ( s ) = 5 0 , 0 0 0 s ( s + 1 0 ) ( s + 5 0 ) use MATLAB Bode plot sketches to design a lead compensator so P M 5 0 and crossover frequency m a x 2 0 r a d s e c . ( Note: 1 ) Solving this problem requires the maximum phase lead vs . 1 , shown below. 2 ) Referring to the example shown in Lecture 1 6 will help

magnetic field coaxial cable amperes law

Schottky junction on n - type GaAs. T = 3 0 0 K . Nd = 1 E 1 6 . Barrier height is 0 . 8 8 V . ( a ) Built - in voltage, depletion region width, and Emax at zero bias. ( b ) If the barrier lowering is 5 \ % of the barrier height, determine the reverse voltage.

( a ) What is frequency - hopping spread spectrum? Explain frequency - hopping with diversity with an example.

( 2 0 points ) Laplace Transform ( a ) Find the Laplace transforms of the following signals and determine their region of convergence. i . ( 5 points ) f ( t ) = t e - a t ( s i n 0 t ) 2 u ( t ) ii . ( 5 points ) f ( t ) = e - b | t | where b 0 ( b ) The Laplace transform of a causal signal x ( t ) is given by x ( s ) = 1 s 2 + 2 s + 5 , ROC: R e

NREL's System Advisor Model has financial models for? Residential Building Commercial Building Third Party Ownership All of the above

( a ) A line charge of uniform charge density Q is distributed around the circumference of a ring of radius a in air. Denoting by V and vec ( E ) , respectively, the electric scalar potential ( with respect to the reference point at infinity ) and field intensity due to this charge at the ring center, we have the following: ( i ) V = 0 and vec ( E

Which of the following tests requires the supply to be energised? A ) Continuity of circuit protective conductors B ) Earth fault loop impedance Q ) Insulation resistance D ) Continuity of ring final circuit conductors

can you do this We are generating a PWM signal as shown below by toggling an I / O pin between 0 and 1 on an MCU. The resulting waveform varies between OV - 3 . 3 V . Could you propose a circuit to shift this waveform around OV mean, so that the output waveform varies between - 1 . 6 5 V to + 1 . 6 5 V . Could you propose another circuit to shift

Q 1 ) For the Boolean function F ( A , B , C , D ) = ( 0 , 1 , 2 , 3 , 7 , 8 , 1 0 ) + d ( 5 , 6 , 1 1 , 1 5 ) a ) Draw the Karnaugh Map. b ) Write down all prime implicants. c ) Mark essential prime implicants. Give your reasoning by indicating the minterm ( s ) that make them essential. d ) Find a simplified SOP expression for F using prime

Q - 1 - ( 3 0 Points ) Consider the circuit shown below. Use the following parameters for your calculations. Transistor parameters: h F E = = 3 0 0 , | V B E | = 0 . 6 V , V T = 2 5 m V , V A = infinite. AC signal " V i " is applied at the input. a ) Find D C operating values for I C 1 , I C 2 , I C 2 and I C 4 . I C 1 = q , I C 2 = q , I C 3 = q

( b ) Design a half - wave rectifier power supply to deliver an average voltage of 9 V with a peak - to - peak ripple of 2 V to a load. The peak load current is 1 0 0 mA . Assume that ideal diodes and 6 0 Hz AC voltage sources of any amplitudes needed are available. Draw the circuit diagram for your design and specify the values of all components

2 . ( 2 0 marks ) A magnetic circuit is shown in Fig. 2 , in which the left and right branch have an air gap with a height of 5 cm . The steel frame material has \ ( \ mu _ { r } = \ infty . \ mathrm { N } = 1 0 0 \ ) and the current \ ( \ mathrm { I } = 5 \ mathrm { ~A } \ ) . Find a ) The total reluctance and equivalent circuit b ) The flux

For an emitter follower amplifier with the parameters given below, determine Rin, Gvo, Rout, and Gv . For a voltage seen at the input across Rpi ( Vpi ) , what is the magnitude at the source and the output that results? Beta = 1 0 0 , Ic = 1 mA , Rsig = 1 0 kOhms, RL = 1 kOhms, Vpi = 1 0 mV

What is the electrical trade name for a conduit bender?

P 9 . 4 0 _ 7 ed Given the phasor current Ia = 2 0 A ( magnitude 2 with angle 0 degrees Amps ) . Find the following phasor values: Ib = Magnitude Answer 1 Question 3 at Angle Answer 2 Question 3 Degrees Amps Ic = Magnitude Answer 3 Question 3 at Angle Answer 4 Question 3 Degrees Amps Vg = Magnitude Answer 5 Question 3 at Angle Answer 6 Question 3

In the circuit given below, R = 1 7 . Determine v 1 and v 2 . The value of v 1 in the circuit is 7 2 . 8 2 Numeric Response 1 . Edit Unavailable. 7 2 . 8 2 correct.V . The value of v 2 in the circuit is 2 0 8 . 4 5 Numeric Response 2 . Edit Unavailable. 2 0 8 . 4 5 correct.V .

Find the transfer function H ( s ) = V 0 / ViH ( s ) = V 0 / Vi of the circuit. Express your answer in terms of some or all of the variables C 1 C 1 , C 2 C 2 , R 1 R 1 , R 2 R 2 , and ss . What is the gain of the circuit as 0 0 ?

Can you draw me this circuit in a breadboad? Clear please

Question 1 What is the overdrive voltage ( V o v ) for the transistor? 0 . 6 9 V 1 . 7 8 V 2 . 3 4 V 0 . 7 8 V

Problem 1 0 ( 7 pts . ) : a ) ( 4 pts . ) Draw a negative feedback system with the direct path block with transfer function G 1 ( s ) = 5 s - 2 and with the feedback path block with transfer function G 2 ( s ) = K s + 4 . Calculate the overall transfer function of the feedback loop. b ) ( 3 pts ) Determine the value of K for the system to have an

A continuous - time signal x ( t ) has a bandwidth of F = 1 0 kHz and it is sampled at Fs = 2 2 kHz , then quantized with a quantization step of 1 . 1 Volt. The signal is properly scaled so that - 1 2 8

In a series RC circuit, the voltage across the capacitor during the charging and discharging can be modeled by exponential functions of times. The exponential time constants of charging and discharging are related by

E 4 . 2 A closed loop system is used to track the sun to obtain maximum power from a photovoltaic array. The tracking system may be represented by a unity feedback system and

A 3 - phase, four - pole, 4 6 0 V ( line - line ) . 6 0 Hz , wye - connected induction motor has the following parameters per phase. Ra = 0 . 1 , x ' lr = 0 . 8 , xls = 1 . 3 2 , R ' r = 0 . 3 At no load ( i . e . , slip = 0 ) , the motor draws a current of 1 1 . 0 at a PF of 0 . 8 7 lagging. For slip = 0 . 0 3 , Find the efficiency in % up to 1

The speed of a separately excited de motor is controlled below base speed by a Buck converter. The supply voltage is 2 2 0 V dc . Thearmature circuit has a ra = 0 . 5 5 2 and La = 1 0 mH . The motor constantis k 0 . 1 V / rpm . The drives a constant torque load requiring at average armature current of 3 0 A . On the assumption of continuous a

This domestic violence researcher is concerned that she may be doing some thing wrong by using the dichotomous variables X 1 X 2 Xn ( instead of the original Poisson variables Y 1 Y 2 Yn ) to estimate the unknown parameter To address her concern, make a quantitative comparison between the prop erties of and where is the MLE of obtained by using Y

To which component of a power supply should you connect the alligator clip of an electrostatic discharge wrist strap? Group of answer choices To the right slot of the power receptacle To the left slot of the power receptacle To the circuit board The outer casing To the internal copper wiring

Identify and determine the sensors and actuators needed ( according to the selected controlled variables ) , explain how they work and specify the sensors and actuators. Design a control system based on the supervisory control method by creating block diagrams and P&ID using the sensors and actuators from question number ( 1 ) . Design the signal

Draw a state diagram for an FSM with 2 inputs ( INIT and X ) and one Moore - type output ( Z ) . As long as INIT = 0 , Z is set to 0 . When INIT = 1 , then Z will be set to 1 when X has been 0 for 2 consecutive ticks and 1 for 2 consecutive ticks, regardless of the order of occurrence. Then, Z will stay at 1 until INIT is set to 0 .

Consider the sinusoidal voltage h t . NOTE: This is a multi - part question. Once an answer is submitted, you will be unable to return to this part. Find the amplitude V m . The amplitude V m is V .

a ) [ 1 0 ] Consider a DT system describe by the block diagram given below: Assume the system is casual and initially at REST condition: ( a ) [ 3 ] Determine the difference equation relating y [ n ] with x [ n ] ( b ) 3 Assume x [ n ] = u [ n ] determine y [ - 5 ] , y [ 1 ] and y [ 3 ] by solving the difference equation recursively ( c ) [ 2 ]

Fig. 1 Fig. 2

List any four advantages of numerical relays over electromechanical relays.

1 5 What voltage shall the bus duct fusible switches be rated?

Calculate Convolution by using the Array Method x [ 0 ] = 3 , x [ 1 ] = 1 , x [ 2 ] = 0 , x [ 3 ] = - 2 , x [ n ] = 0 for all other integers n v [ 0 ] = 1 , v [ 1 ] = - 2 , v [ 2 ] = 3 , v [ 3 ] = - 1 , v [ n ] = 0 for all other integers n

For the circuit below: ( a ) Find Req if R = 5 5 5 5 ( b ) Find R if Req = 5 5 5 5 ( c ) find R if R = Req . ( a ) Req = ( b ) R = ( c ) R = Req =

Q 1 ) For the system described by the difference equation, Determine the system frequency response H ( ) of the system, y [ n ] + 5 y [ n - 1 ] + 6 y [ n - 2 ] = 5 x [ n - 1 ] . a ) Find the system frequency response H ( ) b ) Find the system response to the input x [ n ] = 2 c o s ( n )

The electrical conductivity and the electron mobility for some metal at room temperature are 6 . 2 x 1 0 ^ 7 and 0 . 0 0 2 8 respectively. Compute the number of free electrons per cubic meter for this metal at room temperature. What is the number of free electrons per metal atom? Assume a density of 8 . 9 g / cm ^ 3 and an atomic weight of 6 3 . 5

What frequencies are produced at the RF port of a mixer if the two input frequencies are 1 . 5 GHz into the IF port and 7 . 8 GHz into the LO port? Consider all harmonics of both input signals up to and including the second harmonic and sums and differences of all harmonics.

On a 5 0 ohm lossless T - line, the VSWR is measured as 3 . 4 . A voltage maximum

A 3 - phase, 4 0 0 V , 5 0 Hz AC supply with phase sequence ABC is connected to an unbalanced delta connected load with impedances ZAB = 6 + j 1 0 ; ZBC = 7 j 1 2 and ZCA = 5 0 . Find, a ) Line currents, IA , IB& IC b ) Total active power consumed by the load

Solve in paper . . . . A single line diagram of a 3 - phase power system is shown in Figure Q 2 . Positive, negative and zero sequence impedances of the system are shown in Table Q 2 . Table Q 2 \ table [ [ Network Components,X 1 ( pu ) , X 2 ( pu ) , Xo ( pu ) ] , [ Generator 1 ( G 1 ) , 0 . 2 , 0 . 1 5 , 0 . 0 5 ] , [ Generator ) , 0 . 3 , 0 . 2

( 1 ) ( 2 0 pts ) Find the current I and the voltage V for each network below: R 1 = 1 3 R 2 = 2 2

y ( x , t ) = 2 sin ( 4 t + 1 0 x ) ( cm ) , where x is the distance along the string in meters and y is the vertical displacement. Determine: ( a ) the direction of wave travel, ( b ) the reference phase 0 , ( c ) t

Find all the variables of the circuit and make a table with the power absorbed or released by each element.

For the common - base configuration of Fig. 5 . 1 8 , the dc emitter current is 3 . 2 mA and is 0 . 9 9 . Determine the following if the applied voltage is 4 8 mV and the load is 2 . 2 k . a . r e . b . Z i . c . I c . d . V o . e . A v . f . I b .

Design a circuit for a single stage amplifier using nMOSFET technology that has a gain of Avi > 1 0 , f h > 2 MHz , and Zin > 1 2 5 kohms. a . Vdd = 2 0 V , Knw / 2 L = 0 . 5 mA / V ^ 2 , Vth = 1 V b . Cgd = Cgs = Cds = 1 pF

Question 1 The current in the 2 mH inductor is 1 0 cos ( 5 0 0 0 t 2 0 ) A 1 0 cos ( 5 0 0 0 t 2 0 ) A . Calculate ( a ) the inductive reactance and ( b ) the phasor voltage.

A one - horsepower motor will have a full - load current of _ _ _ _ amperes when connected to 9 0 volts DC . a . 6 . 8 b . 9 . 5 c . 9 . 6 d . 1 2 . 2

For the given Opamp circuit below, determine V o after 1 ms .

6 . 2 A two - pole, 5 0 - Hz induction motor runs at 2 8 9 0 rpm . Calculate ( i ) Synchronous speed of the motor, and ( ii ) slip of the motor.

1 0 . 2 Find V 0 in the circuit in Figure P 1 0 . 2 .

A plane wave in the air with E = x 9 - y 4 - z 6 ) e ^ - j ( 2 x + 3 z ) V / m is incident upon the planar surface of a dielectric material, with epsilonr = 2 . 2 5 , and it occupies the half - space z > 0

Calculate the currents through left loop, right loop, and bridge. Compare the calculated currents to the measured currents. Measured Data from DMM Reader Left Loop: 5 . 1 6 mA Right Loop: 3 . 4 9 mA Bridge: 1 . 6 8 mA

. When an N . O . limit switch is wired to an input module, and programmed using an N . O . contact symbol ( Examine ON ) , the instruction will be true ( check all correct answers ) : a . when power is applied and the key switch is in the run position b . when the limit switch is closed c . as long as the limit switch is open d . never

1 3 . 1 5 Given the difference equation 1 y [ k ] + y [ k - 1 ] + - y [ k - 2 ] = x [ k ] - x [ k - 2 ] , ( i ) determine the transfer function representing the LTID system; ( ii ) determine the impulse response of the LTID system;

The technical NEC definition of a system in which the neutral conductor is not switched is referred to as:

Problem Statement: Design a small - signal voltage amplifier that meets the following specifications: 1 ) Voltage gain of 5 0 or more 2 ) Minimum input resistance of \ ( 1 5 \ mathrm { k } \ Omega \ ) 3 ) Output resistance less than \ ( 1 0 0 \ Omega \ ) 4 ) Maximum unclipped output of 2 V peak - to - peak 5 ) Power supply voltage of 9 V and lower

Assume that the inverter in the network has a propagation delay of 5 ns and the NAND gate has a propagation delay of 1 0 ns . Complete the timing diagram for the network showing \ ( \ mathrm { X } , \ mathrm { Y } \ ) , and Z .

the forcing function of a plc allows the user to turn an external input or output on or off

Problem 5 . Using the Current Divider method, calculate the current across each resistor

a simple proportional gain is used in a buck converter. a ramp comparator is used to generate the pwm circuit, the converter has the following parameters. what is the filter open loop bandwidth?

\ mu A . If A = 3 . 0 0 0 , determine vL ( 0 ) , vL ( 0 + ) , iL ( 0 ) , and iL ( 0 + ) .

Design, build and test a circuit that forces the oscillometric pulse signal to stay within the range of 0 V to 5 V . Vin = 2 . 5 v V + = 5 and V - = - 5 V . diode is 0 . 7 V I believe. I need to figure out what should the resistor be for the positive clipper using an op - amp.

Determine f ( t ) if F ( j \ omega ) is given by the following. 4 . 0 0 0 \ delta ( \ omega ) The solution of 4 . 0 0 0 \ delta ( \ omega ) is ( A ) / ( \ pi ) where A is ( Round the final answer to one decimal place. )

NIT 1 2 CURRENT ELECTRICITY 8 7 9 Find the terminal potential difference of each cell in circuit of figure. Answer ( 2 3 . 8 V , 7 . 8 V )

No 1 for the time being ignore the hydraulic actuater so that the system model becomes Y ( S ) Q ( s ) = 1 4 . 5 s 2 + 4 s + 2 0 + N With the apsopriate value of N from your student number inserted, as described above ) By analysing - the Steady - State behaviour of - this naodel and by Sketching its step response to a 3 units step input at 9 (

In the circuit shown, assume the BJTs have the following characteristics: For Q 1 : V B E ( o n ) = 0 . 6 V , = 1 0 0 , and V C E ( s a t ) = 0 . 3 V . For Q 2 : V E B ( o n ) = 0 . 6 V , = 1 0 0 , and V E C ( s a t ) = 0 . 3 V . Determine the states of the BJTs . Determine the values of I B , I C , V B E , and V C E for Q 1 , and I B , I C , V E

If a - connected load has a balanced impedance of 1 2 7 ? 5 2 and a line voltage of 4 3 0 V rms , what is the magnitude of the line current ( in A rms ) ? Answer: