Basic Engineering Circuit Analysis
11th Edition
ISBN: 9781118992661
Author: Irwin, J. David, NELMS, R. M., 1939-
Publisher: Wiley,
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Textbook Question
Chapter 3, Problem 47P
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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.
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, 0
Derive, 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 A
Chapter 3 Solutions
Basic Engineering Circuit Analysis
Ch. 3 - Use nodal analysis to find V1 in the circuit in...Ch. 3 - Find both Io and Vo in the network in Fig. P3.2...Ch. 3 - Find I1 in the network in Fig. P3.3.Ch. 3 - Find I1 in the circuit in Fig. P3.4.Ch. 3 - Use nodal analysis to find V1 in the circuit in...Ch. 3 - Find V1 and V2 in the circuit in Fig. P3.6 using...Ch. 3 - Use nodal analysis to find both V1 and Vo in the...Ch. 3 - Write the node equations for the circuit in Fig....Ch. 3 - Find Vo in the network in Fig. P3.9.Ch. 3 - Find Io in the circuit in Fig. P3.10 using nodal...
Ch. 3 - Use nodal analysis to find Io in the network in...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Find Vo in the network in Fig. P3.13 using nodal...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Find Io in the network in Fig. P3.15 using nodal...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Use nodal analysis to find Vo in the network in...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Find Vo in the circuit in Fig. P3.19 using...Ch. 3 - Find Vo in the network in Fig. P3.20 using nodal...Ch. 3 - Find Vo in the network in Fig. P3.21 using nodal...Ch. 3 - Find Io in the circuit in Fig. P3.22 using nodal...Ch. 3 - Use nodal analysis to determine the node voltages...Ch. 3 - Use nodal analysis to find Vo in the network in...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Use nodal analysis to solve for the node voltages...Ch. 3 - Find Vo in the network in Fig. P3.27 using nodal...Ch. 3 - Find Io in the network in Fig. P3.28 using nodal...Ch. 3 - Use nodal analysis to find Io in the circuit in...Ch. 3 - Find Vo in the circuit in Fig. P3.30 using nodal...Ch. 3 - Find Io in the circuit in Fig. P3.31 using nodal...Ch. 3 - Use nodal analysis to find Io in the circuit in...Ch. 3 - Using analysis, find Vo in the network in Fig....Ch. 3 - Find Vo in the network in Fig. P3.34 using nodal...Ch. 3 - Find Vo in the circuit in Fig. P3.35 using nodal...Ch. 3 - Find Vo in the circuit in Fig. P3.36 using nodal...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Find Vo in the circuit in Fig. P3.38 using nodal...Ch. 3 - Find Vo in the circuit in Fig. P3.39 using nodal...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Find Vo in the network in Fig. P3.41.Ch. 3 - Find I0 in the network in Fig. P3.42 using nodal...Ch. 3 - Find Vo in the network in Fig. P3.43 using nodal...Ch. 3 - Find Io in the network in Fig. P3.44 using nodal...Ch. 3 - Find Vo in the network in Fig. P3.45 using nodal...Ch. 3 - Find Vo in the circuit in Fig. P3.46 using nodal...Ch. 3 - Find Io in the network in Fig. P3.47 using nodal...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Find Vo in the network in Fig. P3.49 using nodal...Ch. 3 - Find Vo in the network in Fig. P3.50 using nodal...Ch. 3 - Find Vo in the circuit in Fig. P3.51.Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Determine Vo in the network in Fig. P3.53 using...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Find Io in the circuit in Fig. B3.56 using nodal...Ch. 3 - Use nodal analysis to solve for IA in the network...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Use nodal analysis to find V1,V2,V3, and V4 in the...Ch. 3 - Determine Vo in the network in Fig. P3.60 using...Ch. 3 - Use nodal analysis to find V1,V2,V3, and V4 in the...Ch. 3 - Use nodal analysis to determine the node voltages...Ch. 3 - Use nodal analysis to determine the node voltages...Ch. 3 - Use nodal analysis to determine the node voltages...Ch. 3 - Find Io in the network in Fig. P3.65 using mesh...Ch. 3 - Find Vo in the network in Fig. P3.66 using mesh...Ch. 3 - Find Vo in the network in Fig. P3.67 using mesh...Ch. 3 - Find Io in the circuit in Fig. P3.68 using mesh...Ch. 3 - Use mesh analysis to find Vo in the circuit in...Ch. 3 - Find Io in the circuit in Fig. P3.70 using mesh...Ch. 3 - Use mesh analysis to find Vo in the network in...Ch. 3 - Find Io in the circuit in Fig. P3.72.Ch. 3 - Find Vo in the circuit in Fig. P3.73 using mesh...Ch. 3 - Find Vo in Fig. P3.74 using mesh analysis.Ch. 3 - Use loop analysis to find Vo in the network in...Ch. 3 - Find Io in Fig. P3.76 using mesh analysis.Ch. 3 - Find Vo in the network in Fig. P3.77 using loop...Ch. 3 - Find Io in the circuit in Fig. P3.78 using loop...Ch. 3 - Find Vo in the circuit in Fig. P3.79 using mesh...Ch. 3 - Use mesh analysis to find Vo in the circuit in...Ch. 3 - Use mesh analysis to find Io in the network in...Ch. 3 - Use loop analysis to find Vo in the circuit in...Ch. 3 - Use loop analysis to calculate the power supplied...Ch. 3 - Use loop analysis to find Io and I1 in the network...Ch. 3 - Find Vo in the network in Fig. P3.85 using loop...Ch. 3 - Find Vo in the circuit in Fig. P3.86 using...Ch. 3 - Find Io in network in Fig. P3.87 using loop...Ch. 3 - Find Io in the network in Fig. P3.88 using loop...Ch. 3 - Use loop analysis to find Vo in the circuit in...Ch. 3 - Using loop analysis, find Vo in the network in...Ch. 3 - Find Io in the circuit in Fig. P3.91 using mesh...Ch. 3 - Use analysis to find Io in the network in Fig....Ch. 3 - Using loop analysis, find Io in the circuit in...Ch. 3 - Find the mesh currents in the network in Fig....Ch. 3 - Using loop analysis, find Vo in the circuit in...Ch. 3 - Using loop analysis, find Vo in the network in...Ch. 3 - Find Io in the circuit in Fig. P3.97 using loop...Ch. 3 - Find Io in the network in Fig. P3.98 using loop...Ch. 3 - Find Vo in the circuit in Fig. P3.99 using loop...Ch. 3 - Use nodal analysis to find Vo in Fig. P3.100.Ch. 3 - Find Vo in the circuit in Fig. P3.101 using nodal...Ch. 3 - Use loop analysis to find Vo in the network in...Ch. 3 - Use nodal analysis to find Vo in the network in...Ch. 3 - Find Vo in the network in Fig. P3.104 using nodal...Ch. 3 - Find the power supplied by the 2-A current source...Ch. 3 - Find Io in the network in Fig. P3.106 using nodal...Ch. 3 - Find Vo in the circuit in Fig. P3.107 using loop...Ch. 3 - Use mesh analysis to find Vo in the circuit in...Ch. 3 - Using mesh analysis, find Vo in the circuit in...Ch. 3 - Find Vo in the circuit in Fig. P3.110 using nodal...Ch. 3 - Find Vx in the circuit in Fig. P3.111.Ch. 3 - Find Io in the circuit in Fig. P3.112.Ch. 3 - Write mesh equations for the circuit in Fig....Ch. 3 - Find Ix in the circuit in Fig. P3.114 using loop...Ch. 3 - Solve for the mesh currents defined in the circuit...Ch. 3 - Solve for the assigned mesh currents in the...Ch. 3 - Using the assigned mesh currents shown in Fig....Ch. 3 - Find Vo in the network in Fig. B3.118.Ch. 3 - Using loop analysis, find Vo in the circuit in...Ch. 3 - Using loop analysis, find Vo in the circuit in...Ch. 3 - Using loop analysis, find Vo in the network in...Ch. 3 - Using loop analysis, find Vo in the circuit in...Ch. 3 - Using loop analysis, find Io in the network in...Ch. 3 - Use analysis to find Io in the circuit in Fig....Ch. 3 - Find Vo in the circuit in Fig. P3.125 using loop...Ch. 3 - Using loop analysis, find Io in the circuit in...Ch. 3 - Use mesh analysis to determine the power delivered...Ch. 3 - Use mesh analysis to find the power delivered by...Ch. 3 - Use nodal analysis to find Vo in the circuit in...Ch. 3 - Find Io in the network in Fig. P3.130 using nodal...Ch. 3 - Find Vo in the circuit in Fig. 3PFE-l. a. 3.33 Vc....Ch. 3 - Determine the power dissipated in the 6-ohm...Ch. 3 - Find the current Ix in the 4-ohm resistor in the...Ch. 3 - Determine the voltage Vo in the circuit in Fig....Ch. 3 - What is the voltage V1 in the circuit in Fig....
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