Delmar's Standard Textbook of Electricity (MindTap Course List)
6th Edition
ISBN: 9781285852706
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 24, Problem 1PA
You are an electrician working in a plant. A series resonant circuit is to be used to produce a high voltage at a frequency of 400 Hz. The inductor has an inductance of 15 mH and a wire resistance of 2
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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 24 Solutions
Delmar's Standard Textbook of Electricity (MindTap Course List)
Ch. 24 - What is the phase angle relationship of current...Ch. 24 - What is the phase angle relationship of current...Ch. 24 - What is the phase angle relationship of current...Ch. 24 - An AC circuit has a frequency of 400 Hz. A 16-...Ch. 24 - If 440 V are connected to the circuit, how much...Ch. 24 - Prob. 6RQCh. 24 - What is the true power of the circuit in Question...Ch. 24 - What is the apparent power of the circuit in...Ch. 24 - What is the power factor of the circuit in...Ch. 24 - How many degrees are the voltage and current out...
Ch. 24 - You are an electrician working in a plant. A...Ch. 24 - Prob. 1PPCh. 24 - The circuit is connected to a 400-Hz line with an...Ch. 24 - The circuit is connected to a 60-Hz line. The...Ch. 24 - This circuit is connected to a 1000-Hz line. The...Ch. 24 - A series RLC circuit contains a 4-k resistor, an...Ch. 24 - A series RLC circuit contains a resistor with a...Ch. 24 - Is the power factor in Question 6 a leading or...Ch. 24 - A series RLC circuit contains a resistor with a...Ch. 24 - A series RLC circuit has an applied voltage of 240...Ch. 24 - A series RLC circuit is connected to a 60-Hz power...
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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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