Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN: 9780133923605
Author: Robert L. Boylestad
Publisher: PEARSON
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Chapter 24, Problem 46P
To determine
(a)
To sketch:
The connections required to the measure the total watts delivered to the load using three watt-meter.
To determine
(b)
The total wattage dissipation and the reading of each wattmeter.
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Answer the following problems in a short/long bond paper size. Round off your answer up to 2
decimals, if applicable. Show your complete solution and box your final answer.
You may not copy the problem.
1. Two properly connected wattmeters are used to measure the power drawn by a 440 V
squirrel-cage induction motor. If the wattmeters read 60 kW and 32 kW, find the line
current drawn by the motor.
2. A 3-phase feeder carries two lagging balanced loads. The power drawn in each is
measured by a standard two wattmeter method, giving the following readings: First load:
W; = 160 kW; W2 = 96 KW and second load: W. = 90 kW; W; = 48 KW. Find the total
kVA load on the feeder.
3. Two-wattmeter method is used to test a 25 hp, 230 V, 1800 rpm, 60 Hz, 3-phase
induction motor. If the readings of the wattmeters are 13,400 Ww and 7,400 W, find the
power factor of the load.
4. The input power to a 3-phase induction motor running without a load is measured by a
two wattmeter method. One wattmeter reads…
1. Find the average power drawn by each charge. Total average power drawn by the loadFind.
2. Find the total average power of the load using the 2 wattmeter method. You find on 1compare with the result.
7. An electromagnet consists of a coil with a laminated core assembly. This device takes 6 A
when connected to a 120 V DC course. When energized from a 120 V, 60 Hz AC source, the
current is 2 A. The wattmeter reads 100 W.
a. Determine the true ohmic resistance of the coil and the effective resistance of the
coil.
b. Explain why there is a difference between the true ohmic resistance and the
effective resistance values for the same coil winding.
Chapter 24 Solutions
Introductory Circuit Analysis (13th Edition)
Ch. 24 - A balanced V load having a 10 resistance in each...Ch. 24 - Repeat Problem 1 if each phase impedance is...Ch. 24 - Repeat Problem 1 if each phase impedance is...Ch. 24 - The phase sequence for the Y-Y system in Fig....Ch. 24 - Repeat Problem 4 if each phase impedance are...Ch. 24 - Repeat Problem 4 if each phase impedance is...Ch. 24 - For the system in Fig. 24.43, find the magnitude...Ch. 24 - Computer the magnitude of the voltage EAB for the...Ch. 24 - For the Y-Y system in Fig. 24.45: a. Find the...Ch. 24 - For the Y-Y system of Fig. 24.46 the impedance of...
Ch. 24 - A balanced load having a 20 resistance in each...Ch. 24 - Repeat Problem 11 if each phase impedance is...Ch. 24 - Repeat Problem 11 if each phase impedance is...Ch. 24 - The phase sequence for the Y- system in Fig....Ch. 24 - Repeat Problem 14 if each phase impedance is...Ch. 24 - Repeat Problem 14 if each phase impedance are...Ch. 24 - Prob. 17PCh. 24 - For the connected load in Fig. 24.49: a. Find the...Ch. 24 - A balanced V load having a 30 resistance in each...Ch. 24 - Repeat Problem 19 if each phase impedance is...Ch. 24 - Prob. 21PCh. 24 - Prob. 22PCh. 24 - Prob. 23PCh. 24 - Repeat Problem 22 if each phase impedance is...Ch. 24 - Prob. 25PCh. 24 - Prob. 26PCh. 24 - Prob. 27PCh. 24 - The phase sequence for the - system in Fig....Ch. 24 - Repeat Problem 28 if each phase impedance is...Ch. 24 - Repeat Problem 28 if each phase impedance is...Ch. 24 - Prob. 31PCh. 24 - Prob. 32PCh. 24 - Prob. 33PCh. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - Prob. 35PCh. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - Prob. 38PCh. 24 - Prob. 39PCh. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - A balanced, three-phase, -connected load has a...Ch. 24 - A balanced, three-phase, Y-connected load has a...Ch. 24 - Find the total watts, volt-amperes reactive,...Ch. 24 - The Y-Y system in Fig. 24.53 has a balanced load...Ch. 24 - Prob. 45PCh. 24 - Prob. 46PCh. 24 - Repeat Problem 46 for the network in Fig. 24.47.Ch. 24 - For the three-wire system in Fig. 24.55, properly...Ch. 24 - Sketch three different ways that two wattmeters...Ch. 24 - For the Y- system in Fig. 24.56: Determine the...Ch. 24 - For the system in Fig. 24.57: Calculate the...Ch. 24 - For the three-phase, three-wire system in Fig....
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- Q1) A power is to be distributed to the consumers either by a 3-wire DC system or by a 3- phase three wire system .Compare the amount of copper required in the two systems .Assume the same voltage between the outer wire and neutral wire . same percentage loss, balanced load and unity power factor . the middle wires are of half of cross-sectional area as that of outersarrow_forwardQ1. If in one cycle (360 degrees), all of instantaneous power falls under positive loops (no negative loops), the load must be: a.) a resistor b.) an inductor or capacitor Explain: Q2. A wattmeter will indicate zero when the current lags (or leads) the voltage by 90 degrees. Explainarrow_forwardWhich negative environmental impact is NOT present in wind energy? O a. all of these O b. water use O c. thermal pollution O d. chemical pollutionarrow_forward
- Sample Problems 1. Three identical resistances of 75 ohms are connected in delta across 440 V, 3 phase supply. The value of resistance in each leg of the equivalent star connected load would be ? a) 15 pbmsarrow_forwardDiscuss thr impact of wind energy on power systemarrow_forwardHow will you calculate the average wattmeter reading in one wattmeter method for balanced load?arrow_forward
- Explain 6 methods of improving power factor in electrical systemarrow_forwardANSWER THE FOLLOWING PROBLEM: MAKE SURE TO SHOW YOUR COMPLETE SOLUTION AND ANSWER MUST BE IN FOUR DECIMAL PLACES. 1. The load taken from a supply consists of (a) lamp load 10 kW a unity power factor (b) motor load of 80 kVA at 0.8 power factor (lag) and (c) motor load of 40 kVA at 0.7 power factor leading. Calculate the total load taken from the supply in kW and in kVA and the power factor of the combined load.arrow_forwardDiscuss the differences between the current coil and voltage coil of a wattmeter from a design point of view.What will be the consequences if the current coil and voltage coil of a wattmeter are interchanged by mistake?What are the possible errors in this measurement?Can you measure power in an ac circuit by using an ammeter and voltmeter? If No, why? If yes, how?What is to be done if the wattmeter reads in the negative direction?arrow_forward
- In a two wattmeter method of power measurement, If the wattmeter reads P1 and P2, then the active power drawn by the load isarrow_forwardComplete the sentence The power factor must be close to will be reduced To insure that losses in the transmission linesarrow_forwardIn the calibration of single-phase, energy meter, find the value of Eactual in watthour for the given data. The number of revolutions per kWhr is given by 525. Load V(Volts) I (Amp) N time in Number of seconds revolutions 300 209 0.9 140 3 Еactualarrow_forward
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