EBK INTRODUCTORY CIRCUIT ANALYSIS
13th Edition
ISBN: 9780133923872
Author: Boylestad
Publisher: PEARSON CUSTOM PUB.(CONSIGNMENT)
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Textbook Question
Chapter 24, Problem 49P
Sketch three different ways that two wattmeters can be connected to measure the total power delivered to the load in Problem 17.
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With proper figure, prove that two wattmeters are sufficient tocalculate the power in a balanced three phase circuit
Power and Power factor of a star connected balanced load can be measure by using minimum ______ wattmeter’s.
Calculate the reading of each wattmeter in the circuit shown if the phase voltage at the load is 120 V and
1. Zϕ=8 + j6 Ω;
2. Zϕ=8 − j6 Ω;
3. Zϕ=5 + j5 3 Ω; and
4. Zϕ=10 −75° Ω.
5. Verify for (a)–(d) that the sum of the wattmeter readings equals the total power delivered to the load.
Chapter 24 Solutions
EBK INTRODUCTORY CIRCUIT ANALYSIS
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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- Q12 Choose correct answer: In 3-phase power measurement using two wattmeter method , if one wattmeter reads 3.5 times the other, then the power factor is A) 0.720 B) 1 C) 0.866 D) 0arrow_forward2/When the two wattmeter method is used to measure the Input Power of a balanced star connected load, the readings on the wattmeters are 9 KW and 5 KW. The connections to current coil and voltage coil on the meter reading 5 KW, have been reversed. a) Draw the circuit diagram which illustrates the above problem b) Determine the total input power c) Determine the load Power Factor.arrow_forwardWith the aid of a circuit diagram, show that two wattmeters can be connected to read the total power in a three-phase, three-wire system. Two wattmeters connected to read the total power in a three-phase system supplying a balanced load read 10.5 kW and −2.5 kW respectively. Calculate the total active power. Drawing suitable phasor diagrams, explain the significance of: (a) equal wattmeter readings; (b) a zero reading on one wattmeter.arrow_forward
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- The two-wattmeter method is used to measure the total power taken by a balanced three-phase load, known to be passive. What is the PF of the load if: (a) one wattmeter reads 0; (b) the magnitude of one wattmeter reading is twice the magnitude of the other; (c) the magnitudes of the two wattmeter readings are equal?arrow_forwardTwo wattmeters were connected to measure the power of a balanced 3-phase load. If the readings were 716.507 w and 283.494 w, what is the total reactive power of the load is in vars.arrow_forwardQ10) If the total power is 450 kW in a power measurement of a 3- Phase delta connected load by 1- wattmeter method, Calculate wattmeter reading. a. 1350 kW b. 150 W c. 150 kW d. 450 kWarrow_forward
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