Mindtap For Herman's Delmar's Standard Textbook Of Electricity, 2 Terms Printed Access Card (mindtap Course List)
7th Edition
ISBN: 9781337900621
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 22, Problem 9PP
In an RC parallel circuit, the true power is 780 watts and the reactive power is 560 VARs. Find the power factor.
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Q1 .Determine the model of the following system using Mason's rule
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; (d) the total
active power taken from the supply and its power factor.
ANS= 8.8 A, 416 V, 15.25 A, 5810 W
Chapter 22 Solutions
Mindtap For Herman's Delmar's Standard Textbook Of Electricity, 2 Terms Printed Access Card (mindtap Course List)
Ch. 22 - When a capacitor and a resistor are connected in...Ch. 22 - A capacitor and a resistor are connected in...Ch. 22 - What is the impedance of the circuit in Question...Ch. 22 - What is the power factor of the circuit in...Ch. 22 - How many degrees out of phase are the current and...Ch. 22 - Refer to the formulas in Appendix B in the...Ch. 22 - What is the capacitance of the capacitor in...Ch. 22 - A resistor and capacitor are connected in parallel...Ch. 22 - Prob. 1PPCh. 22 - Prob. 2PP
Ch. 22 - Assume that the circuit shown in Figure 22-2 is...Ch. 22 - Assume that the circuit shown in Figure 22-2 is...Ch. 22 - In an RC parallel circuit, R=3.6kandXC=4.7k. Find...Ch. 22 - In an RC parallel circuit,...Ch. 22 - In an RC parallel circuit, ET=120volts,IT=1.2...Ch. 22 - In an RC parallel circuit, the apparent power is...Ch. 22 - In an RC parallel circuit, the true power is 780...Ch. 22 - In an RC parallel circuit, ET=7.5 volts at 1 kHz....
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- "I need something clear written by hand with steps." Find Laplace transform and the corresponding ROC for x(t) = e−3sin(2t) u(t)dtarrow_forwardThree 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.arrow_forward(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 Varrow_forward
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- Don't use ai to answer I will report you answerarrow_forwardShow 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_forward
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