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electrical engineering

Questions and Answers of Electrical Engineering

A balanced three-phase source serves the following loads: Load 1: 18 kVA at 0.8 pf lagging Load 2: 10 kVA at 0.7 pf leading Load 3: 12 kW at unity pf Load 4: 16 kVA at 0.6 pf
A balanced three-phase source supplies power to three loads. The loads are: Load 1: 18 kW at 0.8 pf lagging Load 2: 10 kVA at 0.6 pf leading Load 3: unknown If the line voltage at the load is
A balanced three-phase source supplies power to three loads. The loads are: Load 1: 20 kVA at 0.6 pf lagging Load 2: 12 kW at 0.75 pf lagging Load 3: unknown If the line voltage at the load is
A standard practice for utility companies is to divide its customers into single-phase users and three-phase users. The utility must provide three-phase users, typically industries, with all three
A three-phase abc-sequence wye-connected source with Van=220
A three-phase abc-sequence wye-connected source with Van = 220
Find C in the network shown such that the total load has a power factor of 0.9 lagging.
Find C in the network shown such that the total load has a power factor of 0.92 leading.
Find C in the network shown such that the total load has a power factor of 0.92 lagging.
A wye-connected load consists of a series RL impedance. Measurements indicate that the rms voltage across each element is 84.85 V. If the rms line current is 6 A, find the total complex power for
A balanced three-phase delta-connected load consists of an impedance of . If the line voltage at the load is measured to be 230 V rms, find the magnitude of the line current and the total real
Two balanced three-phase loads are connected in parallel. One load with a phase impedance of is connected in delta, and the other load has a phase impedance of and is connected in wye. If the
The total complex power at the load of a three-phase balanced system is . Find the real power per phase.
Determine the driving point impedance at the input terminals of the network shown in fig P11.1 as a function of s.
Determine the voltage transfer function Vo(s)/Vc(s) as a function of s for the network shown in fig p11.1.
Determine the voltage transfer function Vo(s)/Vc(s) as a function of s for the network shown in fig p11.3.
Find the transfer impedance Vo(s) / Is (s) for the network shown in fig 11.4.
Find the driving point impedance at the input terminal of the circuit in fig 11.5.
Draw the bode plot for the network function.
Draw the bode plot for the network function. Discuss.
Draw the bode plot for the network function. Discuss in detail.
Draw the bode plot for the network function. Discuss briefly.
Draw the bode plot for the network function. Briefly.
Sketch the magnitude characteristic of the bode plot for the transfer function.
Draw the bode plot for the network function. Explain.
Sketch the magnitude characteristic of the bode plot for the transfer function. Discuss.
Sketch the magnitude characteristic of the bode plot for the transfer function. Discuss in detail.
Sketch the magnitude characteristic of the bode plot for the transfer function. Briefly explain.
Sketch the magnitude characteristic of the bode plot for the transfer function. Briefly.
Sketch the magnitude characteristic of the bode plot for the transfer function. Explain.
Sketch the magnitude characteristic of the bode plot for the transfer function. Describe.
Sketch the magnitude characteristic of the bode plot for the transfer function. Discuss briefly.
Draw the Bode plot for the network function. Describe.
Sketch the magnitude characteristics of the Bode plot for the transfer function.
Sketch the magnitude characteristic of the Bode plot for the transfer function. Briefly.
Determine H (jw) if the amplitude characteristic for H (jw) is shown in fig 26.
Find H (jw) if its magnitude characteristic is shown in fig 27.
Find H (jw) if its magnitude characteristic is shown in fig 28.
Find H (jw) if its amplitude characteristic is shown in fig 29.
Find H (jw) if its magnitude characteristics is shown in fig 11.30.
Find H (jw) if its amplitude characteristics is shown in fig 11.31.
Given the magnitude characteristics in fig 11.32, find G (jw).
Find G(jw) if the amplitude characteristic fir this function is shown in fig 11.33.
A series of RLC circuit resonates at 2000 rad/s. If C= 20F and it is known that the impedance at resonance is 2.4 ohm, compute the value of L, the Q of the circuit and the bandwidth.
A series of resonant circuit has a Q of 120 and a resonant frequency of 60,000 rad/s. Determine the half-power frequencies and the bandwidth of the circuit.
Given the series RLC circuit in fig 11.36 if R=10ohm , find the values of L and C such that the network will have a resonant frequency of 100 kHz and a bandwidth of 1kHz.
Given the network in fig 11.37, find Wo ,Q, Wmax and Vo (max).
Repeat the problem 11.37 if the value of R is changed to 0.1ohm.
A series RLC circuit is driven by a signal generator. The resonant frequency of the network is known to be 1600 rad/s and at that frequency the impedance seen by the signal generator is 5ohm. If
A variable frequency voltage source drives the network in fig 11.40. Determine the resonant frequency ,Q,BW and the average power dissipated by the network at resonance.
In the network in fig 11.41 the inductor value is 30mH, and the circuit is driven by a variable frequency source. If the magnitude of the current at resonance is 12A, Wo=1000rad/s and L=10mH, find C,
Given the network in fig 11.42, find Vo (max).
A parallel RLC resonant circuit with a resonant frequency of 20,000rad/s has admittance at resonance of 1ms. If the capacitance of the network is 5F, find the values of R and L.
A parallel RLC resonant circuit with a resistance of 200ohm. If it is known that the bandwidth is 80rad/s, find the values of the parameters L and C.
A parallel RLC circuit, which is driven by a variable frequency 2-a current source, has the following values: R=1Kohm,L=100mH, and C=10F. Find the bandwidth of the network, the half-power
A parallel RLC circuit, which is driven by a variable-frequency 10-A source, has the following parameters: R=500ohm, L=0.5 mH, and C=20F. Find the resonant frequency, the BW, and the average
Consider the network in fig 11.47. If R=2Kohm, L=20mH, C=50F, and Rs=infinity, determine the resonant frequency Wo, the Q of the network, and the bandwidth of the network. What impact does an
The source in the network in fig 11.48 is i(t) = cos1000t + cos1500t A.R=200ohm and C=500F. If Wo =1000rad/s, find L, Q, and the BW. Compute the o/p voltage Vo (t) and discuss the
Determine the parameters of a parallel resonant circuit which has the following properties: Wo = 2Mrad/sec, BW = 20 krad/sec, and an impedance of 2000ohm.
Determine the value of C in the network shown in fig 11.50 in order for the circuit to be in resonance.
Determine the equation for the nonzero resonant frequency of the impedance shown in fig 11.51.
Determine the new parameters of the network shown in fig 11.52 if Znew = 10000 Zold.
Determine the new parameters of the network shown in fig 11.52 if Wnew = 10000 Wold.
Given the network in fig 11.54 sketch the magnitude characteristic of the transfer function
Given the network in fig 11.55, sketch the magnitude characteristic of the transfer function.
Determine what type of filter the network shown in fig 11.56 represents by determining the voltage transfer function.
Given the lattice network shown in fig 11.58 determine what type of filter this network represents by determining the voltage transfer function.
Given the network shown in fig 11.59 and employing the voltage follower analyzed in chapter 3 determine the voltage transfer function and its magnitude characteristic. What type of filter does the
Determine the voltage transfer function and its magnitude characteristic for the network shown in fig 11.60 and identify the filter properties.
Given the network in fig 11.61 find the transfer function and determine what type of filter the network represents.
Repeat problem 11.54 for the network shown in fig 11.62.
In all OTA problem, the specifications are gm - Iabc sensitivity = 20, maximum gm = 1mS with range of 4 decades. For the circuit in figure 11.50, find gm and Iabc values required for a
In all OTA problem, the specifications are gm - Iabc sensitivity = 20, maximum gm = 1mS with range of 4 decades. For the circuit in figure 11.53, find gm and Iabc values required for a
Use the summing circuit in figure 11.51 to design a circuit that realizes the following function. Vo = 7V1 + 3V2
Prove that the circuit in figure p11.66 is a simulated inductor. Find the inductance in terms of C, gm1 and gm2.
In the Tow-Thomas biquad in figure 11.57, C1=20pF, C2 =10 pF, gm = 10S, gm2 = 80S, gm3 =10S. Find the low pass filter transfer function for the Vi1 – V02 i/p- o/p pair. Plot
Find the transfer function of the OTA filter in figure 11.68. Express Wo and Q in terms of the capacitances and transconductances. What kind of filter is it.
Find the transfer function of the OTA filter in fig 11.69. Express Wo and Q in terms of the capacitances and transconductances. What kind of filters is it?
Refer to the ac/dc converter low-pass filter application of example 11.25. If we put the converter to use powering a calculator, the load current can be modeled by a resistor as shown in fig 11.25.
Referring to Ex 11.28 design a notch filter for the tape deck for use in Europe, where power utilities generate at 50 Hz
Determine the resonant frequency of the circuit in fig 11PFE-1 and find the voltage Vo at resonance.
Given the series circuit in fig 11PFE-2, determine the resonant frequency and find the value of R so that the BW of the network about the resonant frequency is 200 r/s.
Given the low-pass filter circuit in fig 11PFE-3, determine the frequency in Hz at which the output is down from the dc, or very low frequency, output.
Given the band-pass shown in fig 11PFE-4, find the components L and R necessary to provide a resonant frequency of 1000 r/s and a BW of 100 r/s.
Given the low-pass shown in fig 11PFE-5, find the half-power frequency and the gain of this circuit, if the source frequency is 8Hz.
Find the Laplace Transform of the function F(t) = te-at g (t-1)
Find the Laplace transform of the function f(t) = te-a(t-1)g(t-1)
if f (t) = e-at cos(ωt) show F(s) = s + a / (s + a)2 + (ω)2
Find F(s) if f(t) = e-at sin (ωt)u(t-1)
if f(t) = t cos (ω)u (t-1) Find F (s)
Find F(s) if f (t) = te-at u(t-4)
Use the shifting Theorem to determine where f(t) = [e-(t-2) – e-2]u(t-2)
Use the shifting Theorem to determine L{f(t)} where f(t) = [e-(t-2) – e –(t-1)]u(t-1)
Use Property Number 5 to find L {f(t)} if f(t) = e –at u(t – 1)
Use Property Number 6 to find L{f(t)} if f(t) = e –at u(t – 1)
Given the following functions F(s), find f (t), F(s) = 4/(s + 1) + (s + 2) F(s) = 10s/(s + 1) + (s + 4)
Given the following functions F(s), find f(t) F(s) = s + 10/(s + 4) + (s + 6) F(s) = 24/(s + 2) + (s + 8)
Given the following functions F(s), find f(t) if F(s) = s + 1 / s(s + 2) + (s + 3) F(s) = s2 + s + 1 / s(s + 2) + (s + 1)
Given the following functions F(s), find f (t). F(s) = s2 + 5s + 4 / (s + 2) (s + 4) (s + 6) F(s) = (s + 3) (s + 6) / s (s2 + 8s + 12)
Given the following functions F(s), find f(t). F(s) = s2 + 7s + 12 / (s + 2) (s + 4) (s + 6) F(s) = (s + 3) (s + 6) / s (s2 + 10s + 24)

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