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electrical engineering

Questions and Answers of Electrical Engineering

Repeat problem 9.24 for the network in Fig P 9.28
Repeat problem 9.24 for the network in Fig P 9.29
Determine the impedance Z for maximum average power transfer and the value of the maximum average power absorbed by the load in the network shown in Fig P. 9.30
average power transfer and the value of the maximum average power absorbed by the load in the network shown in Fig P. 9.31
Determine the impedance ZL for the maximum average power transfer and the value of the maximum average power absorbed by the load in the network shown in Fig P 9.33
Compute the rms value of the voltage given by the waveform shown in Fig P 9.34
Find the rms values of the waveform shown in Fig P 9.35
Calculate the rms value of the waveform shown in Fig P 9.36
Calculate the rms value of the waveform shown in Fig P 9.37
The current waveform in Fig P 9.38 is flowing through a 5- resistor. Find the average power absorbed by the resistor.
Calculate the rms value of the waveform shown in Fig P 9.39
Compute the rms value of the waveform in Fig 9.40
Calculate the rms value of the waveform shown in Fig 9.41
Calculate the rms value of the waveform shown in Fig 9.42
An industrial load consumes 100 kW at 0.8 pf lagging. If an ammeter in the transmission line indicates that the load current is 284 A rms, find the load voltage.
An industrial load that consumes 80 kW is supplied by the power company through a transmission line with 0.1 ohms resistance, with 84kW. If the voltage at the load is 440 Vrms, find the power factor
The power company supplies 80 kW to an industrial load. The load draws 220 A rms from the transmission line. If the load voltage is 440 V rms and the load power factor is 0.8 lagging, find the
An industrial plant with an inductive load consumes 10 kW of power from a 220 V rms line. If the load power factor is 0.8, what is the angle by which the load voltage leads the load current?
The power company must generate 100 kW in order to supply an industrial load with 94 kW through a transmission line with 0.09  resistance. If the load power factor is 0.83 lagging, find the
An industrial load operates at 30 kW, 0.8 pf lagging. The load voltage is 2200 V rms. The real and reactive power losses in the transmission-line feeder are 1.8 kW and 2.4 kvar,
A transmission line with impedance 0.08 – j 0.25 ohms is used to deliver power to a load. The load is inductive and the3 load voltage is 220 0 V rms at 60 Hz. If the load requires
Find the source voltage in the network shown in Fig P 9.50
Given the network in Fig P 9.51, compute the input source voltage and the input power factor.
Given the network in Fig P 9.52, determine the input voltage Vs.
Find the input source voltage and the power factor of the source for the network shown in Fig P 9.53
Use Kirchhoff€™s laws to compute the source voltage of the network shown in Fig P 9.54.
Given the network in Fig P9.55, determine the input voltage V5.
What value of capacitance must be placed in parallel with the 18-kW load in Problem 9.51 in order to raise the power factor of this load to 0.9 lagging?
An industrial load is supplied through a transmission line that has a line impedance of 0.1 + j0.2 ohms. The 60-Hz line voltage at the load is 480
A plant consumes 60 kW at a power factor of 0.5 lagging from a 220-V rms 60-Hz line. Determine the value of the capacitor which when placed in parallel with the load will change the load power
A small plant has a bank of induction motors that consume 64 kW at a pf of 0.68 lagging. The 60-Hz line voltage across the motors is 220
The 60-Hz line voltage for a 60-kW, 0.76-pf lagging industrial load is 440
A particular load has a pf of 0.8 lagging. The power delivered to the load is 40 kW from a 220-V rms 60-Hz line. What value of capacitance placed in parallel with the load will raise the pf to
An industrial load consumes 44 kW at 0.82 pf lagging from a 220
A bank of induction motors consumes 36 kW at 0.78 pf lagging from a 60-Hz, 220
A single-phase three-wire 60-Hz circuit serves three loads, as shown in Fig P9.64. Determine L.qa, L.nN, Lc, and the energy use over a 24-hour period in kilowatt-hours.
A man and his son are flying a kite. The kite becomes entangled in a 7200-V power line close to a power pole. The man crawls up the pole to remove the kite. While trying to remove the kite, the
A number of 120-V household fixtures are to be used to provide lighting for a large room. The total lighting load is 8 kW. The National Electric Code requires that no circuit breaker be large than
A 5.1-kW household range is designed to operate on a 240-V rms sinusoidal voltage, as shown in Fig. P9.67. However, the electrician has mistakenly connected the range to 120 V rms, as shown in Fig
In order to test a light socket, a woman, while standing on cushions that insulate her from the ground, sticks her finger into the socket, as shown in Fig P9.68. The tip of her finger makes contact
An inexperienced mechanic is installing a 12-V battery in a car. The negative terminal has been connected. He is currently tightening the bolts on the positive terminal. With a tight grip on the
An industrial load consumes 120 kW at 0.707 pf lagging and is connected to a 480
Determine the average and rms values of the following waveform.
Find the impedance ZL in the network in Fig 9PFE-3 for maximum average power transfer.
A rms-reading volmeter is connected to the output of the op-amp shown in Fig. 9PFE-4. Determine the meter reading.
Determine the average power delivered to the resistor in Fig. 9PFE-5a if the current waveform is shown in Fig. 9PFE-5b.
Sketch a phasor representation of a balanced three-phase system containing both phase voltages and line voltages if V =100
A positive-sequence three-phase balanced wye voltage source has a phase voltage of . V =100
Sketch a phasor representation of an abc-sequence balanced three-phase -connected source, including ,V, V , and V if V =208
Sketch a phasor representation of a balanced three-phase system containing both phase voltages and line voltages if V =120
A positive-sequence three-phase balanced wye voltage source has a phase voltage of V =240
Sketch a phasor representation of a balanced three-phase system containing both phase voltages and line voltages if V =208
A positive-sequence balanced three-phase wye-connected source with a phase voltage of 100 V supplies power to a balanced wye-connected load. The per phase load impedance is 40+ j10 ohms . Determine
A positive-sequence balanced three-phase wye-connected source supplies power to a balanced wye-connected load. The magnitude of the line voltages is 150 V. If the load impedance per phase is ,
An abc-sequence balanced three-phase wye-connected source supplies power to a balanced wye-connected load. The line impedance per phase is , and the load impedance per phase is . If the source
In a three-phase balanced wye-wye system, the source is an abc-sequence set of voltages with . The per phase impedance of the load is . If the line impedance per phase is , find the line
An abc-sequence set of voltages feeds a balanced three-phase wye-wye system. The line and load impedances are and , respectively. If the load voltage on the a phase is , determine the voltages
In a balanced three-phase wye-wye system, the source is an abc-sequence set of voltages. The load voltage on the a phase is , , and . Determine the input sequence of voltages.
A balanced abc-sequence of voltages feeds a balanced three-phase wye-wye system. The line and load impedances are 0.6j and , respectively. The load voltage on the a phase is. . Find the line
In a balanced three-phase wye-wye system, the source is an abc-sequence set of voltages. , , and the load voltage on the a phase is Van = 398.1
Report Text: From stick figures in the sand and the earliest animals painted and carved in stone, people worldwide have reacted to the world by making images, the fundamental goal of art,
An abc-phase sequence balanced three-phase source feeds a balanced load. The system is connected wye-wye and
In a balanced three-phase wye-wye system, the total power loss in the lines is 272.57 W. Van = 105.28
In a balanced three-phase wye-wye system the load impedance is . The source has phase sequence abc and Van= 120
In a balanced three-phase wye-wye system the load impedance is . The source has phase sequence abc and the line voltage Vab=220
In a balanced three-phase wye-wye system, the load impedance is . The source has an abc-phase sequence and Van=120
In a balanced three-phase wye-wye system, the source is an abc-sequence set of voltages and Van = 120
In a balanced three-phase wye-wye system, the source is an abc-sequence set of voltages and Van = 120
An abc-sequence set of voltages feeds a balanced three-phase wye-wye system. If Van = 440
In a three-phase balanced positive-sequence system a delta-connected source supplies power to a wye-connected load. If the line impedance is , the load impedance , and the source phase voltage Vab
Given the network shown, compute the line currents and the magnitude of the phase voltage at the load.
In a balanced three-phase delta-wye system the source had an abc-phase sequence. The line and load impedances are and , respectively. If the line current IaA = 9.6
An abc-phase-sequence three-phase balanced wye-connected 60-Hz source supplies a balanced delta-connected load. The phase impedance in the load consists of a resistor in series with a 50-mH
An abc-phase-sequence three-phase balanced wye-connected source supplies a balanced delta-connected load. The impedance per phase in the delta load is . The line voltage at the source is Vab =
An abc-phase-sequence three-phase balanced wye-connected source supplies power to a balanced delta-connected load. The impedance per phase in the load is . If the source voltage for the a phase is
An abc-phase-sequence three-phase balanced wye-connected source supplies a balanced delta-connected load. The impedance per phase of the delta load is . If the line impedance is zero and the line
An abc-phase-sequence three-phase balanced wye-connected source supplies power to a balanced delta-connected load. The impedance per phase of the delta load is . If the line impedance is zero and
In a balanced three-phase wye-delta system, the source has an abc-phase sequence and Van = 120
In a balanced three-phase wye-delta system, the source has an abc-phase sequence and Van = 120
In a three-phase balanced delta-delta system, the source has an abc-phase sequence. The line and load impedances are and , respectively. If the load current in the delta is IAB = 15
In a balanced three-phase delta-delta system, the source has an abc-phase sequence. The phase angle for the source voltage is
A three-phase load impedance consists of a balanced wye in parallel with a balanced delta. What is the equivalent wye load and what is the equivalent delta load if the phase impedance of the wye and
In a balanced three-phase system, the abc-phase-sequence source is wye connected and Vab = 120
In a balanced three-phase system, the source is a balanced wye with an abc-phase sequence and Vab = 208
In a balanced three-phase system, the source is a balanced wye with an abc-phase sequence and Vab = 208
In a balanced three-phase system the source, which has an abc-phase sequence, is connected in delta and Vab=208
In a balanced three-phase system, the source has an abc-phase sequence and is connected in delta. There are two parallel wye-connected loads. The phase impedance of load 1 and load 2 is and ,
In a balanced three-phase system, the source has an abc-phase sequence and is connected in delta. There are two loads connected in parallel. The line connecting the source to the loads has an
In a balanced three-phase system, the source has an abc-phase sequence and is connected in delta. There are two loads connected in parallel. Load 1 is connected in wye and has a phase impedance of
A balanced three-phase delta-connected source supplies power to a load consisting of a balanced delta in parallel with a balanced wye. The phase impedance of the delta is , and the phase impedance
An abc-sequence wye-connected source having a phase-a voltage of is attached to a wye-connected load having an impedance of . If the line impedance is , determine the total complex power
The magnitude of the complex power (apparent power) supplied by a three-phase balanced wye-wye system is 3600 VA. The line voltage is 208 V rms. If the line impedance is negligible and the power
A balanced three-phase wye-wye system has two parallel loads. Load 1 is rated at 3000 VA, 0.7 pf lagging, and load 2 is rated at 2000 VA, 0.75 pf leading. If the line voltage is 208 V rms, find the
Two industrial plants represent balanced three-phase loads. The plants receive their power from a balanced three-phase source with a line voltage of 4.6 kV rms. Plant 1 is rated at 300 kVA, 0.8 pf
A cluster of loads is served by a balanced three-phase source with a line voltage of 4160 V rms. Load 1 is 240 kVA at 0.8 pf lagging and load 2 is 160 kVA at 0.92 pf lagging. A third load is
A balanced three-phase source serves two loads: Load 1: 36 kVA at 0.8 pf lagging Load 2: 18 kVA at 0.6 pf lagging The line voltage at the load is 208 V rms at 60 Hz. Find the line current and the
A balanced three-phase source serves the following loads: Load 1: 48 kVA at 0.9 pf lagging Load 2: 24 kVA at 0.75 pf lagging The line voltage at the load is 208 V rms at 60 Hz. Determine the line
A small shopping center contains three stores that represent three balanced three-phase loads. The power lines to the shopping center represent a three-phase source with a line voltage of 13.8 kV
The following loads are served by a balanced three-phase source: Load 1: 18 kVA at 0.8 pf lagging Load 2: 8 kVA at 0.8 pf leading Load 3: 12 kVA at 0.75 pf lagging The load voltage is 208
A balanced three-phase source supplies power to three loads. The loads are: Load 1: 30 kVA at 0.8 pf lagging Load 2: 24 kW at 0.6 pf leading Load 3: unknown If the line voltage and total

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