Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Chapter 10, Problem 1TSC
To determine
To identify: The cause for a particular symptom in a given circuit.
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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 10 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 10 - In a series RC circuit, the impedance increases...Ch. 10 - In a series RC lag circuit, the output voltage is...Ch. 10 - Admittance is the reciprocal of susceptance.Ch. 10 - In a parallel RC circuit, as frequency is...Ch. 10 - The phase angle of an RC circuit is measured...Ch. 10 - Prob. 6TFQCh. 10 - Prob. 7TFQCh. 10 - The power factor is equal to the tangent of the...Ch. 10 - A purely resistive circuit has a power factor of...Ch. 10 - Prob. 10TFQ
Ch. 10 - Prob. 1STCh. 10 - Prob. 2STCh. 10 - Prob. 3STCh. 10 - When the frequency of the voltage applied to a...Ch. 10 - Prob. 5STCh. 10 - Prob. 6STCh. 10 - The voltages in Problem 6 are measured at a...Ch. 10 - Prob. 8STCh. 10 - Prob. 9STCh. 10 - When the frequency of the source voltage is...Ch. 10 - Prob. 11STCh. 10 - Prob. 12STCh. 10 - Prob. 13STCh. 10 - Prob. 14STCh. 10 - If the bandwidth or a certain low-pass filter is 1...Ch. 10 - Prob. 1TSCCh. 10 - Prob. 2TSCCh. 10 - Prob. 3TSCCh. 10 - Determine the cause for each set of symptoms....Ch. 10 - Determine the cause for each set of symptoms....Ch. 10 - An 8 kHz sinusoidal voltage is applied to a series...Ch. 10 - What is th waveshape of the current in the circuit...Ch. 10 - Find the impedance of each circuit in Figure...Ch. 10 - Determine the impedance and the phase angle in...Ch. 10 - For the circuit of Figure 10-69, determine the...Ch. 10 - Repeat Problem 5 for C=0.0047F.Ch. 10 - Calculate the total current in each circuit of...Ch. 10 - Repeat Problem 7 for the circuits in Figure 10-68.Ch. 10 - For the circuit in Figure 10-70, draw the phase or...Ch. 10 - For the circuit in Figure 10-71, determine the...Ch. 10 - To what value must the rheostat be set in Figure...Ch. 10 - For the lag circuit in Figure 10-73, determine the...Ch. 10 - Repeat Problem 12 for the lead circuit in Figure...Ch. 10 - Determine the impedance for the circuit in Figure...Ch. 10 - Determine the impedance and the phase angle in...Ch. 10 - Repeat Problem 15 for the following frequencies:...Ch. 10 - Determine the impedance and phase angle in Figure...Ch. 10 - For the circuit in Figure 10-78, find all the...Ch. 10 - For the parallel circuit in Figure 10-79, find...Ch. 10 - For the circuit in Figu 10-80, determine the...Ch. 10 - Repeat Problem 20forR=4.7k,C=0.047F,andf=500Hz.Ch. 10 - Convert the circuit in Figure 10-81 to an...Ch. 10 - Determine the voltages across each element in...Ch. 10 - Is the circuit in Figure 10-82 predominantly...Ch. 10 - Find the current through each branch and the total...Ch. 10 - For the circuit in Figure 10-83, determine the...Ch. 10 - In a certain seris RC circuit, the true power is 2...Ch. 10 - In Figure 10-71, what is the true power and the...Ch. 10 - What is the power factor for the circuit of Figure...Ch. 10 - Determine Ptrue, Pr, Pa,andPF for the circuit in...Ch. 10 - The lag circuit in Figure 10-73 also acts as a...Ch. 10 - Plot the frequency response curve for the circuit...Ch. 10 - Draw the voltage phasor diagram for each circuit...Ch. 10 - Thr rms value of the signal voltage out of...Ch. 10 - Determine the cutoff frequency for each circuit in...Ch. 10 - Determine the bandwidth of the circuit in Figure...Ch. 10 - Assume that the capacitor in Figure 10-85 is...Ch. 10 - Each of the capacitors in Figure 10-86 has...Ch. 10 - Determine the output voltage for the circuit in...Ch. 10 - Determine the output voltage for the circuit in...Ch. 10 - A single 240V,60Hz source drives two loads. Load A...Ch. 10 - What value of coupling capacitor is required in...Ch. 10 - Determine the value of R1 required to get a phase...Ch. 10 - Draw the voltage and current phasor diagram for...Ch. 10 - A certain load dissipates 1.5kW of power with an...Ch. 10 - Deteine the series element or element that are in...Ch. 10 - Determine the value of C2 in Figure 10-91 when...Ch. 10 - Draw the schematic for the circuit in Figure 10-92...Ch. 10 - Open file P10-49; files are found at...Ch. 10 - Open file P10-50. Determine if there is a fault...Ch. 10 - www.prenhall.com/floyd. Open file P10-51....Ch. 10 - www.prenhall.com/floyd. Open file P10-52....Ch. 10 - www.prenhall.com/floyd. Open file P10-53....Ch. 10 - www.prenhall.com/floyd. Open file P10-54....
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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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