Introductory Circuit Analysis; Laboratory Manual For Introductory Circuit Analysis Format: Kit/package/shrinkwrap
13th Edition
ISBN: 9780134297446
Author: Boylestad, Robert L.
Publisher: Prentice Hall
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Chapter 18, Problem 36P
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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
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 kW
Chapter 18 Solutions
Introductory Circuit Analysis; Laboratory Manual For Introductory Circuit Analysis Format: Kit/package/shrinkwrap
Ch. 18 - Discuss, in your own words, the difference between...Ch. 18 - Convert the voltage source in Fig. 18.62 to a...Ch. 18 - Convert the current source in Fig. 18.63 to a...Ch. 18 - Convert the votage source in Fig. 18.64(a) to a...Ch. 18 - Write the mesh equations for the network of Fig....Ch. 18 - Write the mesh equations for the network of Fig....Ch. 18 - Write the mesh equations for the network of Fig....Ch. 18 - Write the mesh equations for the network of Fig....Ch. 18 - Write the mesh equations for the network of Fig....Ch. 18 - Write the mesh equtions for the network of Fig....
Ch. 18 - Write the mesh equations for the network of Fig....Ch. 18 - Using mesh analysis, determine the current IL (in...Ch. 18 - Using mesh analysis, determine the current IL (in...Ch. 18 - Write the mesh equations for the network of Fig....Ch. 18 - Write the mesh equations for the network of...Ch. 18 - Write the mesh equations for the network of Fig....Ch. 18 - Determine the nodal voltages for the network of...Ch. 18 - Determine the nodal voltages for the network of...Ch. 18 - Determine the nodal voltages for the network of...Ch. 18 - Determine the nodal voltages for the network of...Ch. 18 - Determine the nodal voltages for the network of...Ch. 18 - Determine the nodal voltages for the network of...Ch. 18 - Determine the nodal votas for the network of Fig....Ch. 18 - Determine the nodal voltages for the network of...Ch. 18 - Write the nodal equations for the network in Fig....Ch. 18 - Write the nodal equations for the network of Fig....Ch. 18 - Write the nodal equations for the network of Fig....Ch. 18 - Write the nodal equations for the network of Fig....Ch. 18 - For the network of Fig. 18.87, determine the...Ch. 18 - For the bridge network in Fig. 18.88: Fig. 18.88...Ch. 18 - For the bridge network in Fig. 18.89: a. Is the...Ch. 18 - The Hay bridge in Fig. 18.90 is balanced. Using...Ch. 18 - Determine whether the Maxwell bridge in Fig. 18.91...Ch. 18 - Derive the balance equations (18.16) and (18.17)...Ch. 18 - Determine the balance equations for the inductance...Ch. 18 - Using the -YorY-conversion, determine the current...Ch. 18 - Using the -YorY-conversion, determine the current...Ch. 18 - Using the -YorY-conversion, determine the current...Ch. 18 - Using the -YorY-conversion, determine the current...Ch. 18 - Determine the mesh currents for the network of...Ch. 18 - Prob. 41PCh. 18 - Prob. 42PCh. 18 - Prob. 43PCh. 18 - Prob. 44PCh. 18 - Determine the nodal voltages for the network of...Ch. 18 - Determine the nodal voltages for the network of...Ch. 18 - Prob. 47PCh. 18 - Determine the nodal voltages for the network of...Ch. 18 - Determine the nodal voltages for the network of...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- not 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_forwardDon't use ai to answer I will report you answerarrow_forward
- Show with the aid of a phasor diagram that for both star- and delta-connected balanced loads, the total active power is given by √3VI cos φ, where V and I are the line values of voltage and current respectively and φ is the angle between phase values of voltage and current. A balanced three-phase load consists of three coils, each of resistance 4 Ω and inductance 0.02 H. Determine the total active power when the coils are (a) star-connected, (b) delta-connected to a 400 V, three phase, 50 Hz supply. ANS:11.56 kW, 34.7 kWarrow_forwardThe load connected to a three-phase supply comprises three similar coils connected in star. The line currents are 25 A and the apparent and active power inputs are 20 kVA and 11 kW respectively. Find the line and phase voltages, reactive power input and the resistance and reactance of each coil. If the coils are now con nected in delta to the same three-phase supply, calculate the line currents and the active power taken. ANS : 462 V, 267 V, 16.7 kvar, 5.87 Ω, 8.92 Ω; 75 A, 33 kWarrow_forwardA 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_forward
- Derive 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_forwardDeduce the relationship between the phase and the line voltages of a three-phase star-connected generator. If the phase voltage of a three-phase star-connected generator is 200 V, what will be the line voltages: (a) when the phases are correctly connected; (b) when the connections to one of the phases are reversed? ans: 346 V; 346 V, 200 V, 200 Varrow_forward
- Q2: Given a discrete sequence x(n) = [1,-1,2,4, 1, 3,-1,1] and its spectrum X(k): i. Show that: X(k) =G(k)+WH(k) k=0,1,2,3,4,5,6,7 where G(k) = DFT[g(n)] and H(k) = DFT[h(n)], g(n) and h(n) are even and odd components of x(n) respectively. ii. Compute G(k) and H(k) using the method of computation of DFTS of two real sequences. (15 marks)arrow_forwardQ2: Given a discrete sequence x(n) = [1,-1,2,4, 1, 3,-1,1] and its spectrum X(k): i. Show that: X(k) = G(k)+WH(k) k = 0,1,2,3,4,5,6,7 where G(k) = DFT[g(n)] and H(k) = DFT[h(n)], g(n) and h(n) are even and odd components of x(n) respectively. ii. Compute G(k) and H(k) using the method of computation of DFTS of two real sequences.arrow_forwardQ1 .For the unity feedback control system shown below, discuss the stability using Bode Plotarrow_forward
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