Fundamentals of Electric Circuits
6th Edition
ISBN: 9780078028229
Author: Charles K Alexander, Matthew Sadiku
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 19.4, Problem 5PP
Determine the h parameters for the circuit in Fig. 19.24.
Figure 19.24
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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 kW
The 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 kW
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.
Chapter 19 Solutions
Fundamentals of Electric Circuits
Ch. 19.2 - Find the z parameters of the two-port network in...Ch. 19.2 - Calculate I1 and I2 in the two-port of Fig. 19.11....Ch. 19.3 - Obtain the y parameters for the T network shown in...Ch. 19.3 - Obtain the y parameters for the circuit in Fig....Ch. 19.4 - Determine the h parameters for the circuit in Fig....Ch. 19.4 - Find the impedance at the input port of the...Ch. 19.4 - For the ladder network in Fig. 19.30, determine...Ch. 19.5 - Find the transmission parameters for the circuit...Ch. 19.5 - Prob. 9PPCh. 19.6 - Determine [y] and [T] of a two-port network whose...
Ch. 19.6 - Find the z parameters of the op amp circuit in...Ch. 19.7 - Find V2/Vs in the circuit in Fig. 19.43. Figure...Ch. 19.7 - Obtain the y parameters for the network in Fig....Ch. 19.7 - Obtain the ABCD parameter representation of the...Ch. 19.8 - Obtain the h parameters for the network in Fig....Ch. 19.8 - Obtain the z parameters of the circuit in Fig....Ch. 19.9 - For the transistor amplifier of Fig. 19.60, find...Ch. 19.9 - Prob. 18PPCh. 19 - For the single-element two-port network in Fig....Ch. 19 - For the single-element two-port network in Fig....Ch. 19 - For the single-element two-port network in Fig....Ch. 19 - For the single-element two-port network in Fig....Ch. 19 - For the single-element two-port network in Fig....Ch. 19 - For the single-element two-port network in Fig....Ch. 19 - When port 1 of a two-port circuit is...Ch. 19 - A two-port is described by the following...Ch. 19 - If a two-port is reciprocal, which of the...Ch. 19 - Prob. 10RQCh. 19 - Obtain the z parameters for the network in Fig....Ch. 19 - Find the impedance parameter equivalent of the...Ch. 19 - Find the z parameters of the circuit in Fig....Ch. 19 - Using Fig. 19.68, design a problem to help other...Ch. 19 - Obtain the z parameters for the network in Fig....Ch. 19 - Compute the z parameters of the circuit in Fig....Ch. 19 - Calculate the z parameters of the circuit in Fig....Ch. 19 - Find the z parameters of the two-port in Fig....Ch. 19 - The y parameters of a network are:...Ch. 19 - Construct a two-port that realizes each of the...Ch. 19 - Determine a two-port network that is represeted by...Ch. 19 - For the circuit shown in Fig. 19.73, let z=106412...Ch. 19 - Determine the average power delivered to ZL = 5 +...Ch. 19 - For the two-port network shown in Fig. 19.75, show...Ch. 19 - For the two-port circuit in Fig. 19.76,...Ch. 19 - For the circuit in Fig. 19.77, at = 2 rad/s, z11...Ch. 19 - Prob. 17PCh. 19 - Calculate the y parameters for the two-port in...Ch. 19 - Using Fig. 19.80, design a problem to help other...Ch. 19 - Find the y parameters for the circuit in Fig....Ch. 19 - Obtain the admittance parameter equivalent circuit...Ch. 19 - Obtain the y parameters of the two-port network in...Ch. 19 - (a) Find the y parameters of the two-port in Fig....Ch. 19 - Find the resistive circuit that represents these y...Ch. 19 - Prob. 25PCh. 19 - Calculate [y] for tle two-port in Fig. 19.85.Ch. 19 - Find the y parameters for the Circuit in Fig....Ch. 19 - In the circuit of Fig. 19.65, the input port is...Ch. 19 - In the bridge circuit of Fig. 19.87, I1 = 20 A and...Ch. 19 - Find the h parameters for the networks in Fig....Ch. 19 - Determine the hybrid parameters for the network in...Ch. 19 - Using Fig. 19.90, design a problem to help other...Ch. 19 - Obtain the h parameters for the two-port of Fig....Ch. 19 - Obtain the h and g parameters of the two-port in...Ch. 19 - Determine the h parameters for the network in Fig....Ch. 19 - For the two-port in Fig. 19.94. h=16320.01S Find:...Ch. 19 - The input port of the circuit in Fig. 19.79 is...Ch. 19 - The h parameters of the two-port of Fig. 19.95...Ch. 19 - Obtain the g parameters for the wye circuit of...Ch. 19 - Using Fig. 19.97, design a problem to help other...Ch. 19 - For the two-port in Fig. 19.75, show that...Ch. 19 - The h parameters of a two-port device are given by...Ch. 19 - Find the transmission parameters for the...Ch. 19 - Using Fig. 19.99, design a problem to help other...Ch. 19 - Find the ABCD parameters for the circuit in Fig....Ch. 19 - Find the transmission parameters for the circuit...Ch. 19 - Obtain the ABCD parameters for the network in Fig....Ch. 19 - For a two-port, let A = 4, B = 30 , C = 0.1 S, and...Ch. 19 - Using impedances in the s-domain, obtain the...Ch. 19 - Derive the s-domain expression for the t...Ch. 19 - Obtain the t parameters for the network in Fig....Ch. 19 - (a) For the T network in Fig. 19.106, show that...Ch. 19 - Prob. 53PCh. 19 - Show that the transmission parameters of a...Ch. 19 - Prove that the g parameters can be obtained from z...Ch. 19 - For the network of Fig. 19.107, obtain VoVs....Ch. 19 - Given the transmission parameters T=32017 obtain...Ch. 19 - Design a problem to help other students better...Ch. 19 - Given that g=0.06S0.40.22 determine: (a) [z] (b)...Ch. 19 - Design a T network necessary to realize the...Ch. 19 - For the bridge circuit in Fig. 19.108, obtain: (a)...Ch. 19 - Find the z parameters of the op amp circuit in...Ch. 19 - Determine the z parameters of the two-port in Fig....Ch. 19 - Determine the y parameters at = 1,000 rad/s for...Ch. 19 - What is the y parameter presentation of the...Ch. 19 - In the two-port of Fig. 19.113, let y12 = y21 = 0,...Ch. 19 - If three copies of the circuit in Fig. 19.114 are...Ch. 19 - Obtain the h parameters for the network in Fig....Ch. 19 - The circuit in Fig. 19.116 may be regarded as two...Ch. 19 - For the parallel-series connection of the two...Ch. 19 - Determine the z parameters for the network in Fig....Ch. 19 - A series-parallel connection of two two-ports is...Ch. 19 - Three copies of the circuit shown in Fig. 19.70...Ch. 19 - Determine the ABCD parameters of the circuit in...Ch. 19 - For the individual two-ports shown in Fig. 19.121...Ch. 19 - Use PSpice or MultiSim to obtain the z parameters...Ch. 19 - Using PSpice or MultiSim, find the h parameters of...Ch. 19 - Obtain the h parameters at = 4 rad/s for the...Ch. 19 - Use PSpice or MultiSim to determine the z...Ch. 19 - Use PSpice or MultiSim to find the z parameters of...Ch. 19 - Repeat Prob. 19.26 using PSpice or MultiSim....Ch. 19 - Use PSpice or MultiSim to rework Prob. 19.31....Ch. 19 - Rework Prob. 19.47 using PSpice or MultiSim....Ch. 19 - Using PSpice or MultiSim, find the transmission...Ch. 19 - At =1rad/s, find the transmission parameters of...Ch. 19 - Obtain the g parameters for the network in Fig....Ch. 19 - For the circuit shown in Fig. 19.129, use PSpice...Ch. 19 - Using the y parameters, derive formulas for Zin,...Ch. 19 - A transistor has the following parameters in a...Ch. 19 - A transistor with hfe=120,hie=2khre=104,hoe=20S is...Ch. 19 - For the transistor network of Fig. 19.130,...Ch. 19 - Prob. 92PCh. 19 - Prob. 93PCh. 19 - A transistor in its common-emitter mode is...Ch. 19 - Prob. 95PCh. 19 - Prob. 96PCh. 19 - Synthesize the transfer function...Ch. 19 - A two-stage amplifier in Fig. 19.134 contains two...Ch. 19 - Assume that the two circuits in Fig. 19.135 are...
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