EE 98: Fundamentals of Electrical Circuits - With Connect Access
6th Edition
ISBN: 9781259981807
Author: Alexander
Publisher: MCG
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 12, Problem 67P
As shown in Fig. 12.72, a three-phase four-wire line with a phase voltage of 120 V rms and positive phase sequence supplies a balanced motor load at 260 kVA at 0.85 pf lagging. The motor load is connected to the three main lines marked a, b, and c. In addition, incandescent lamps (unity pf) are connected as follows: 24 kW from line c to the neutral, 15 kW from line b to the neutral, and 9 kW from line c to the neutral.
- (a) If three wattmeters are arranged to measure the power in each line, calculate the reading of each meter.
- (b) Find the magnitude of the current in the neutral line.
Figure 12.72
For Prob. 12.67.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
use kvl to solve
R1 is 978 ohms R2 is 2150 ohms R3 is 4780
R1 is parallel to R2 and R2 is parallel to R3 and R1 and R3 are in series
Q7 For the circuit shown in Fig. 2.20, the transistors are identical and have the following
parameters: hfe = 50, hie = 1.1K, hre = 0, and hoe = 0. Calculate Auf, Rif and Rof.
Ans: 45.4; 112 KQ; 129.
25 V
10k
47k
4.7k
Vo
150k
w
Vs
47k
4.7k
W
22
5μF
33k
50uF
50μF
4.7k
4.7k
R₁
Rof
Rif
R1000
Fig. 2.20 Circuit for Q7.
Chapter 12 Solutions
EE 98: Fundamentals of Electrical Circuits - With Connect Access
Ch. 12.2 - Given that Vbn=22030V, find Van and Vcn, assuming...Ch. 12.3 - A Y-connected balanced three-phase generator with...Ch. 12.4 - One line voltage of a balanced Y-connected source...Ch. 12.5 - A positive-sequence, balanced -connected source...Ch. 12.6 - In a balanced -Y circuit, Vab=44015 and ZY = (12 +...Ch. 12.7 - For the Y-Y circuit in Practice Prob. 12.2,...Ch. 12.7 - Calculate the line current required for a 30-kW...Ch. 12.7 - Assume that the two balanced loads in Fig....Ch. 12.8 - The unbalanced -load of Fig. 12.24 is supplied by...Ch. 12.8 - Find the line currents in the unbalanced...
Ch. 12.9 - Prob. 11PPCh. 12.9 - For the unbalanced circuit in Fig. 12.32, use...Ch. 12.10 - Repeat Example 12.13 for the network in Fig. 12.24...Ch. 12.10 - Let the line voltage VL = 208 V and the wattmeter...Ch. 12.10 - If the load in Fig. 12.35 is delta-connected with...Ch. 12 - What is the phase sequence of a three-phase motor...Ch. 12 - If in an acb phase sequence, , then Vcn is:Ch. 12 - Which of these is not a required condition for a...Ch. 12 - Prob. 4RQCh. 12 - Prob. 5RQCh. 12 - In a Y-Y system, a line voltage of 220 V produces...Ch. 12 - In a - system, a phase voltage of 100 V produces a...Ch. 12 - When a Y-connected load is supplied by voltages in...Ch. 12 - Prob. 9RQCh. 12 - Prob. 10RQCh. 12 - If Vab = 400 V in a balanced Y-connected...Ch. 12 - What is the phase sequence of a balanced...Ch. 12 - Given a balanced Y-connected three-phase generator...Ch. 12 - A three-phase system with abc sequence and VL =...Ch. 12 - For a Y-connected load, the time-domain...Ch. 12 - Using Fig. 12.41, design a problem to help other...Ch. 12 - Obtain the line currents in the three-phase...Ch. 12 - In a balanced three-phase Y-Y system, the source...Ch. 12 - A balanced Y-Y four-wire system has phase voltages...Ch. 12 - For the circuit in Fig. 12.43, determine the...Ch. 12 - In the Y- system shown in Fig. 12.44, the source...Ch. 12 - Using Fig. 12.45, design a problem to help other...Ch. 12 - In the balanced three-phase Y- system in Fig....Ch. 12 - Obtain the line currents in the three-phase...Ch. 12 - The circuit in Fig. 12.48 is excited by a balanced...Ch. 12 - A balanced delta-connected load has a phase...Ch. 12 - A positive sequence wye-connected source where ,...Ch. 12 - If Van = 22060 V in the network of Fig. 12.49,...Ch. 12 - For the - circuit of Fig. 12.50, calculate the...Ch. 12 - Prob. 20PCh. 12 - Three 440-V generators form a delta-connected...Ch. 12 - Find the line currents IaA, IbB, and IcC in the...Ch. 12 - A balanced delta connected source is connected to...Ch. 12 - A balanced delta-connected source has phase...Ch. 12 - In the circuit of Fig. 12.54, if , , , find the...Ch. 12 - Using Fig. 12.55, design a problem to help other...Ch. 12 - A -connected source supplies power to a...Ch. 12 - The line-to-line voltages in a Y-load have a...Ch. 12 - A balanced three-phase Y- system has V rms and Z =...Ch. 12 - In Fig. 12.56, the rms value of the line voltage...Ch. 12 - A balanced delta-connected load is supplied by a...Ch. 12 - Design a problem to help other students better...Ch. 12 - A three-phase source delivers 4.8 kVA to a...Ch. 12 - A balanced wye-connected load with a phase...Ch. 12 - Three equal impedances, 60 + j30 each, are...Ch. 12 - A 4200-V, three-phase transmission line has an...Ch. 12 - The total power measured in a three-phase system...Ch. 12 - Given the circuit in Fig. 12.57 below, find the...Ch. 12 - Find the real power absorbed by the load in Fig....Ch. 12 - For the three-phase circuit in Fig. 12.59, find...Ch. 12 - A balanced delta-connected load draws 5 kW at a...Ch. 12 - A balanced three-phase generator delivers 7.2 kW...Ch. 12 - Refer to Fig. 12.48. Obtain the complex power...Ch. 12 - A three-phase line has an impedance of 1 + j3 per...Ch. 12 - A balanced wye-connected load is connected to the...Ch. 12 - A three-phase load consists of three 100-...Ch. 12 - The following three parallel-connected three-phase...Ch. 12 - A balanced, positive-sequence wye-connected source...Ch. 12 - Each phase load consists of a 20- resistor and a...Ch. 12 - A balanced three-phase source with VL = 240 V rms...Ch. 12 - Consider the wye-delta system shown in Fig. 12.60....Ch. 12 - A four-wire wye-wye circuit has...Ch. 12 - Using Fig. 12.61, design a problem that will help...Ch. 12 - A balanced three-phase Y-source with VP = 880 V...Ch. 12 - A three-phase supply, with the line-to-line...Ch. 12 - Using Fig. 12.63, design a problem to help other...Ch. 12 - Determine the line currents for the three-phase...Ch. 12 - Solve Prob. 12.10 using PSpice or MultiSim. For...Ch. 12 - The source in Fig. 12.65 is balanced and exhibits...Ch. 12 - Use PSpice or MultiSim to determine Io in the...Ch. 12 - Given the circuit in Fig. 12.67, use PSpice or...Ch. 12 - Using Fig. 12.68, design a problem to help other...Ch. 12 - Use PSpice or MultiSim to find currents IaA and...Ch. 12 - For the circuit in Fig. 12.58, use PSpice or...Ch. 12 - A balanced three-phase circuit is shown in Fig....Ch. 12 - A three-phase, four-wire system operating with a...Ch. 12 - As shown in Fig. 12.72, a three-phase four-wire...Ch. 12 - Meter readings for a three-phase wye-connected...Ch. 12 - A certain store contains three balanced...Ch. 12 - The two-wattmeter method gives P1=1200W and...Ch. 12 - In Fig. 12.73, two wattmeters are properly...Ch. 12 - If wattmeters W1 and W2 are properly connected...Ch. 12 - For the circuit displayed in Fig. 12.74, find the...Ch. 12 - Predict the wattmeter readings for the circuit in...Ch. 12 - Prob. 75PCh. 12 - Show that the I2R losses will be higher for a...Ch. 12 - A three-phase generator supplied 10 kVA at a power...Ch. 12 - Prob. 78CPCh. 12 - A balanced three-phase generator has an abc phase...Ch. 12 - A balanced three-phase source furnishes power to...Ch. 12 - A professional center is supplied by a balanced...Ch. 12 - A balanced three-phase system has a distribution...Ch. 12 - A commercially available three-phase inductive...Ch. 12 - Figure 12.76 displays a three-phase...Ch. 12 - Design a three-phase heater with suitable...Ch. 12 - For the single-phase three-wire system in Fig....Ch. 12 - Consider the single-phase three-wire system shown...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Q6)) The transistors in the feedback amplifier shown are identical, and their h-parameters are.. hie = 1.1k, hfe = 50, hre=o, and hoe = 0. Calculate Auf, Rif and Rof. {Ans: 6031583; 4. Kor. Is 4 4.7 k www 4.7k 91k 4.7k 91k 10k 1k. 10k 21000 4.7k w 15k Fig. 2.19 Circuit for Q6.arrow_forwardQ5 For the circuit shown in Fig. 2.18, hie =1.1 KQ, hfe =50. Find Avf, Rif and Rof Ans: -3.2; 193 ; 728 N. Vcc Vs Rs=10kQ Re=4KQ RF - = 40ΚΩ www Fig. 2.18 Circuit for Qs.arrow_forwardSheet No.2 Qi For the source follower shown in Fig. 2.14, Ipss =16 mA, V₂ =-4V, and VGsQ=-2.86 V. Find Avf, Rif and Rof. Assume rd is high. Ans: 0.833; ∞0; 365.7 . VDD Vo Vs R = 2.2 k Fig. 2.14 Circuit for Qi.arrow_forward
- Q4 For the circuit shown in Fig. 2.17, he-100, he -1KQ. Find A, A, R and Rof- Ans:-100; -5; 100 K; 250K. Voc RB = 100 k R.=5k Vs Rs 500 R. = 1 kn Fig. 2.17 Circuit for Quarrow_forwardQ3 The circuit of Fig. 2.16 is to have Af = -1 mA/V, D=1+ BA=50, a voltage gain of -4, Rs = 1KQ, and hfe = 150. Find RL, Re, Rif and Rof. Ans: 4 KN; 980 ; 150 KN; ∞. Vcc RL Vs -OV +11 Fig. 2.16 Circuit for Q3.arrow_forwardQ2 For the circuit shown in Fig. 2.15 hfe =150, hie =1KQ. Find Avf and Rif. Ans: 0.986; 152 KN. Vee R=4k2 Rs 1kQ Vo V, VR=1 KQ Fig. 2.15 Circuit for Q2-arrow_forward
- R1 is 978 ohms, R2 is 2150 ohms R3 is 4780 ohmsarrow_forwardPleasw draw the block diagram, don't type out what it could look like. Draw it. Thank youarrow_forward(Keynes model in continuous time) A continuous version of the Keynes modelis given by the equationsY= C + I + GT*(dC/dt) + C = aYT*(dI/dt) + I = b*(dC/dt)Write the equations in state space form, and give the conditions for stability.arrow_forward
- Can the expert solve an Integral In detall? ⑥M-1 大 80*10万 1012 es dw 7010 80x10³ ⒸP= 1 Sin (Iwl+1) dw 70x10xarrow_forwardQ1:A) Draw the directional control of DC motor using a relay. Switch controlled by PLC +V Ov (a) Motor OV (b) Motor 10 B) Define the encoder with mention its types. The term encoder is used for a device that provides a digital output as a result of angular or linear displacement. incremental encoder 2 6 absolute encoder 2 10 Q2: A) Suppose that PLC connected to three pushbutton switches as shown in this illustration: 4 2000000 0000 000000 0000 Draw a Ladder Diagram program for PLC to turn the lamp ON when the switch statuses be: Switch A = pressed, Switch B = pressed, Switch C = pressed 1:0 I:0 I:0 0:0 H/HH/H 2 Managemenarrow_forwardExample2:- 8. = e.A nia +2.1 = Find the maximum steady-state power capability of a system consisting of a generator equivalent reactance of 0.4pu connected to an infinite bus through a series reactance of 1.0 p.u. The terminal voltage of the generator is held at1.10 p.u. and the voltage of the infinite bus is 1.0 p.u.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Power System Analysis and Design (MindTap Course ...
Electrical Engineering
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
What is the Difference Between Single Phase and Three Phase???; Author: Electrician U;https://www.youtube.com/watch?v=FEydcr4wJw0;License: Standard Youtube License