Engineering Circuit Analysis
9th Edition
ISBN: 9780073545516
Author: Hayt, William H. (william Hart), Jr, Kemmerly, Jack E. (jack Ellsworth), Durbin, Steven M.
Publisher: Mcgraw-hill Education,
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Chapter 12, Problem 22E
(a)
To determine
The line voltages for the given condition.
(b)
To determine
The phase voltages for the given condition.
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Determine a. total impedance b.,. current Ip and c. total power drawn by the circuit
5. The figure below shows two star connected loads with three phase power. The
voltage source is 120Z0°. The loads are Z₁ = 10 + j4 № and Z₂ = 2 +j3 №. The
cables are negligible.
Calculate:
a)
the line and phase current.
b) the real power from the source.
c) the reactive power of the circuit.
Is
V
N
Z₁
Z₁ Z₁
Z₂
Z₂
N
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A 200 V single phase circuit has an apparent power of 5 KVA and reactive power of 4 KVAr. Then find (i) power factor (ii) impedance (iii) resistance (iv) reactance.
Chapter 12 Solutions
Engineering Circuit Analysis
Ch. 12.1 - Let and . Find (a) Vad; (b) Vbc; (c) Vcd.Ch. 12.2 - Prob. 2PCh. 12.2 - Modify Fig. 12.9 by adding a 1.5 resistance to...Ch. 12.3 - A balanced three-phase three-wire system has a...Ch. 12.3 - A balanced three-phase three-wire system has a...Ch. 12.3 - Three balanced Y-connected loads are installed on...Ch. 12.4 - Each phase of a balanced three-phase -connected...Ch. 12.4 - Prob. 8PCh. 12.5 - Determine the wattmeter reading in Fig. 12.24,...Ch. 12.5 - Prob. 10P
Ch. 12 - Prob. 1ECh. 12 - Prob. 2ECh. 12 - Prob. 3ECh. 12 - Describe what is meant by a polyphase source,...Ch. 12 - Prob. 5ECh. 12 - Prob. 6ECh. 12 - Prob. 7ECh. 12 - Prob. 8ECh. 12 - Prob. 9ECh. 12 - Prob. 10ECh. 12 - The single-phase three-wire system of Fig. 12.31...Ch. 12 - Prob. 12ECh. 12 - Referring to the balanced load represented in Fig....Ch. 12 - Prob. 14ECh. 12 - Prob. 15ECh. 12 - Consider a simple positive phase sequence,...Ch. 12 - Assume the system shown in Fig. 12.34 is balanced,...Ch. 12 - Repeat Exercise 17 with Rw = 10 , and verify your...Ch. 12 - Prob. 19ECh. 12 - Prob. 20ECh. 12 - Prob. 21ECh. 12 - Prob. 22ECh. 12 - A three-phase system is constructed from a...Ch. 12 - Prob. 24ECh. 12 - Each load in the circuit of Fig. 12.34 is composed...Ch. 12 - Prob. 26ECh. 12 - Prob. 27ECh. 12 - A three-phase load is to be powered by a...Ch. 12 - For the two situations described in Exercise 28,...Ch. 12 - Prob. 30ECh. 12 - Prob. 31ECh. 12 - Prob. 32ECh. 12 - Repeat Exercise 32 if Rw = 1 . Verify your...Ch. 12 - Prob. 34ECh. 12 - Prob. 35ECh. 12 - Prob. 36ECh. 12 - A wattmeter is connected into the circuit of Fig....Ch. 12 - Find the reading of the wattmeter connected in the...Ch. 12 - (a) Find both wattmeter readings in Fig. 12.39 if...Ch. 12 - Circuit values for Fig. 12.40 are , , , , . Find...Ch. 12 - Prob. 41ECh. 12 - Prob. 42ECh. 12 - (a) Is the load represented in Fig. 12.41...Ch. 12 - Prob. 44E
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- A balanced, three-wire, delta-connected, three-phase load has a phase voltage of 400 V, a line current of 7.5 A and a lagging power factor of 0.9. Calculate the real power. Select one: O a. 5.196 KVA O b. 4.676 KW O c. 1.31KW Od. 2.265 KVAarrow_forward2. Three resistors of 10 0, 15 Q and 30 Q are connected in wye-configuration across a balanced 208 V, 3-phase supply. Find the total power drawn.arrow_forward2) A delta-connected load is supplied from a 230 V, 50 Hz source. If the load has R=100, L = 100 mH per phase. Find: a) The phase voltage and current. b) The line voltage and current.arrow_forward
- A balanced delta-connected load is supplied by a 60 Hz 3-phase source with a line voltage of 240 V. Each load phase draws 6kW at a lagging power factor of 0.8. Calculate: a. The load impedance per phase b. The line current c. The value of the capacitance needed to be connected in parallel with each load to minimize the current from the source (PF=1)arrow_forwardAn alternator with a line voltage of 2400 V supplies a delta connected load. The line current supplied to the load is 40 A. Assuming the load is a balanced three phase load, what is the impedance of each phase? (magnitude onlyarrow_forwardA single phase circuit has an apparent power of 5 kVA and a reactive power of 4 kVAr. Then find (i) power factor (ii) active power (iii) resistance of the circuit when the applied voltage is 200 V.arrow_forward
- Please answer quickly "In series-connected ac circuit, the total voltage across the circuit is always equal to the sum of the magnitude (only) of the individual voltage across each element." True False The power factor is equal to cosine of the phase difference. True False A leading power factor means that the circuit is predominantly capacitive in nature. True False "Since most loads are resistive in nature (e.g. motors), improvement of power factor is done by connecting capacitor banks or a synchronous condenser " True Falsearrow_forwardIn a balanced delta connected 3-phase circuit, has resistance 25 ohm and inductive reactance 40 ohm, connected to a 400V,50HZ 3-phase supply voltage, then total power delivered to load is Select one: O a. 5397.76W O b. 7593.26W O c. NONE OF THESE O d. 1635.34KWarrow_forwardThe line voltage at the terminals of a balanced delta-connected load is 110 V. Each phase of the load consists of a 5.667-ohm resistor in parallel with a 4.75- ohm inductive reactance. What is the magnitude of the current in the line feeding the load?arrow_forward
- A delta connected balanced load is connected to a 3 – phase, 400 V supply. The line current is 35 amperes and the load power factor is 0.8 lagging. Find: A. TOTAL POWER B. TOTAL REACTIVE VOLT AMPEREarrow_forwardA delta connected balanced load is connected to a 3 – phase, 400 V supply. The line current is 35 amperes and the load power factor is 0.8 lagging. Find: 1. Resistance per phase2. Inductance per phase3. Reactance per phasearrow_forwardPart B: Poly-Phase Circuits A three-phase, 330V, 60HZ source is connected to a balanced, purely resistive, three- phase load. Each resistance is 600. Calculate the phase current at the load, the line current and total real power if: 4. a. The load is delta-connected b. The load is wye-connected A 15-HP motor operates at full-load from a 600 V, 3-phase, 60 Hz, delta connected source. The motor is 75% efficient and its power factor is 0.82 lagging. 5. a. Calculate the line and phase currents b. Draw the circuit identifying one line voltage and line current. Also identify one phase voltage and one phase current on the source. C. What is the power generated by one phase of the delta connected source?arrow_forward
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