Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Chapter 19, Problem 52P
To determine
The load impedance
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Find Laplace transform and the corresponding ROC for
x(t) = e−3sin(2t) u(t)dt
Three similar coils, connected in star, take a total
power of 1.5 kW, at a power factor of 0.2, from a
three-phase, 400 V, 50 Hz supply. Calculate: (a) the
resistance and inductance of each coil; (b) the line
currents if one of the coils is short-circuited.
(a) Three 20 µF capacitors are star-connected across
a 400 V, 50 Hz, three-phase, three-wire supply.
Calculate the current in each line. (b) If one of the
capacitors is short-circuited, calculate the line cur
rents. (c) If one of the capacitors is open-circuited,
calculate: the line currents and the p.d. across each
of the other two capacitors.
ANS:
1.525 A; 2.64 A, 2.64 A, 4.57 A; 1.32 A, 1.32 A, 0;
210 V
Chapter 19 Solutions
Introductory Circuit Analysis (13th Edition)
Ch. 19 - Using supeerposition, determine the current...Ch. 19 - Using superposition, determine the current through...Ch. 19 - Using superposition, determine the current IL for...Ch. 19 - Using superposition, determine the voltage across...Ch. 19 - Using superposition, determine the current through...Ch. 19 - Using superposition, find the sinusoidal...Ch. 19 - Using superposition, find the sinusoidal...Ch. 19 - Using superspostion, find the current I for the...Ch. 19 - Using superposition, determine the current IL...Ch. 19 - Using superposition, for the network of Fig....
Ch. 19 - Using superposition, determine the current IL for...Ch. 19 - Determine VL for the network of Fig. 19.116...Ch. 19 - Calculate the current I for the network of Fig....Ch. 19 - Find the voltage Vs for the network in Fig....Ch. 19 - Find the ThĂ©venin equivalent circuit for the...Ch. 19 - Find the Thevenin equivalent circuit for the...Ch. 19 - Find the Thevenin equivalent circuit for the...Ch. 19 - Find the Thevenin equivalent circuit for the...Ch. 19 - Find the Thevenin equivalent circuit for the...Ch. 19 - Find the Thevenin equivalent circuit for the...Ch. 19 - Find the ThĂªvenin equivalent circuit for the...Ch. 19 - Find the ThĂªvenin equivalent circuit for the...Ch. 19 - a. Find the ThĂ©venin equivalent circuit for the...Ch. 19 - a. Find the ThĂ©venin equivalent circuit for the...Ch. 19 - a. Find the ThĂ©venin equivalent circuit of the...Ch. 19 - Determine the ThĂ©venin equivalent circuit for the...Ch. 19 - Determine the ThĂ©venin equivalent circuit for the...Ch. 19 - Prob. 28PCh. 19 - Prob. 29PCh. 19 - Find the ThĂ©venin equivalent circuit for the...Ch. 19 - Determine the ThĂ©venin equivalent circuit for the...Ch. 19 - Prob. 32PCh. 19 - Find the ThĂ©venin equivalent circuit for the...Ch. 19 - Find the Norton equivalent circuit for the network...Ch. 19 - Find the Norton equivalent circuit for the network...Ch. 19 - Find the Norton equivalent circuit for the network...Ch. 19 - Find the Norton equivalent circuit for the portion...Ch. 19 - Find the Norton equivalent circuit for the portion...Ch. 19 - a. Find the Norton equivalent circuit for the...Ch. 19 - a. Find the Norton equivalent circuit for the...Ch. 19 - a. Find the Norton equivalent circuit for the...Ch. 19 - Determine the Norton equivalent circuit for the...Ch. 19 - Determine the Norton equivalent circuit for the...Ch. 19 - Find the Norton equivalent circuit for the network...Ch. 19 - Find the Norton equivalent circuit for the network...Ch. 19 - Prob. 46PCh. 19 - Prob. 47PCh. 19 - Find the load impedance ZL for the network of Fig....Ch. 19 - Find the load impedance ZL for the network of Fig....Ch. 19 - Find the load impedance ZL for the network of Fig....Ch. 19 - Find the load impedance ZL for the network of Fig....Ch. 19 - Prob. 52PCh. 19 - a. Determine the load impedance to replace the...Ch. 19 - a. Determine the load impedance to replace the...Ch. 19 - a. Determine the load impedance to replace the...Ch. 19 - Prob. 56PCh. 19 - a. For the network in Fig. 19.139, determine the...Ch. 19 - For the network in Fig. 19.140, determine two...Ch. 19 - Prob. 59PCh. 19 - Using Millmans theorem, determine the current...Ch. 19 - Prob. 61PCh. 19 - Determine the current IL for the network in Fig....Ch. 19 - Using schematics, determine V2 for the network in...Ch. 19 - Prob. 64PCh. 19 - Using schematics, plot the power to the R-C load...
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- Explain the advantages of three-phase supply for distribution purposes. (b) Assuming the relationship between the line and phase values of currents and voltages, show that the active power input to a three-phase balanced load is √3VI cos φ, where V and I are line quantities. (c) Three similar inductors, each of resistance 10 Ω and inductance 0.019 H, are delta-connected to a three-phase, 400 V, 50 Hz sinusoidal supply. Calcu late: the value of the line current; the power factor and the active power input to the circuit. ANS: 59.5 A, 0.858 lag, 35.5 kWarrow_forwardnot use ai pleasearrow_forwardA three-phase, 400 V, star-connected motor has an output of 50 kW, with an efficiency of 90 per cent and a power factor of 0.85. Calculate the line current. Sketch a phasor diagram showing the voltages and currents. If the motor windings were connected in mesh, what would be the correct voltage of a three phase supply suitable for the motor? ANS: 90.8 A, 240 Varrow_forward
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- A three-phase delta-connected load, each phase of which has an inductive reactance of 40 Ω and a resistance of 25 Ω, is fed from the secondary of a three-phase star-connected transformer which has a phase voltage of 230 V. Draw the circuit diagram of the system and calculate: (a) the current in each phase of the load; (b) the p.d. across each phase of the load; (c) the current in the transformer secondary windings; the total active power taken from the supply and its power factor.arrow_forwardDerive the numerical relationship between the line and phase currents for a balanced three-phase delta connected load. Three coils are connected in delta to a three-phase, three-wire, 400 V, 50 Hz supply and take a line current of 5 A 0.8 power factor lagging. Calculate the resistance and inductance of the coils. If the coils are star-connected to the same supply, calculate the line current and the total power. Calculate the line cur rents if one coil becomes open-circuited when the coils are connected in star. Ans: 110.7 Ω, 0.264 H; 1.67 A, 926 W; 1.445 A, 1.445 A, 0arrow_forwardDerive, for both star- and delta-connected systems, an expression for the total power input for a balanced three-phase load in terms of line voltage, line current and power factor. The star-connected secondary of a transformer supplies a delta-connected motor taking a power of 90 kW at a lagging power factor of 0.9. If the volt age between lines is 600 V, calculate the current in the transformer winding and in the motor winding. Draw circuit and phasor diagrams, properly labelled, showing all voltages and currents in the transformer secondary and the motor. ANS: . 96.2 A, 55.6 Aarrow_forward
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