In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter is zero. The power factor of the load must be a. 0.3 b. Zero c. Unity d. 0.5

Q: Q2: For the circuit in figure shown, determine the current in the neutral line. A ww 880/0 V 25-j102…

A: In a three phase system there are two ways to connect a three phase load. Star/Wye Connection Delta…

Q: Two heating units x and y are connected across a 100V supply. Unit y takes twice as much power as…

A: Given data, x and y are heating systems connected across 100 V supply. Power Py=2Px Total power…

Q: If Current and Voltage are 90 Degree Out of Phase in a single-phase circuit, then the true power…

A: If voltage and current are in 90 degree out of phase  Power factor = cos(phase angle) = cos(90) = 0…

Q: A wye connection load has a voltage of 480v applied to it. What is the voltage dropped across each…

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Q: Load 1 consists of three resistors with a resistance of 6 ohms each, connected in wye and the phase…

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Q: What would be the same results of this quesiton if the circuit was single phase 1000v?

A: If True power is single phase i.e.,P1ϕ=10kWV1ϕ=1000VI1ϕ=12.33 A

Q: e balenced, postive phaequenon, three-phase crou. ZLA 20OLO Vm ZLB B in 9. Zhe=100L60° 2

A: Given source and load are balanced so we can use per phase analysis. Apply KVL in the loop to get…

Q: 3- phase power don't we need to multiply with 3? also Vt=13.1 KV, so shouldn't it be 13.1e3? in the…

A: The three-phase power can be calculated by the formulas shown below:…

Q: Q1. For 'Load at Unity Power Factor' example discussed in the lecture (see figure below), find power…

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Q: H.W. For the given power system, find the source voltage in per-unit value and in actual units.…

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Q: Question No.84 Three loads, each of resistance 50 Q are connected in delta to a 400 V, 3-phase…

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Q: Question 3. The two parallel loads in the figure shown below are as follows. Load 1 absorbs 24 kW…

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Q: Find the value of R for maximum power transfer in the network and the maximum power that can be…

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Q: A wattmeter is connected as shown in the figure. The wattmeter read Current coil Potential coil Z₁…

A: Given circuit,

Q: When a loaded generator is supplying power to a motor, a balanced 3-ph fault occur at the terminals…

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Q: In a resistive load, the current angle: O Leads the voltage by 90. In phase with the voltage angle.…

A: There are three basic elements are present in an electrical circuit. They are resistance, inductance…

Q: What are the advantages and disadvantages in terms of the current and voltage of the following? Draw…

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Q: 38 The voltage from A to N in a balanced three- phase circuit is 240 /–30° V. If the phase sequence…

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Q: Three single phase loads are connected to the 400 V, three phase lines, 60 Hz. Load 1 operating at 3…

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Q: 4. Predict the wattmeter readings for the circuit in the figure below. Wi 240/-60° V Z= 10 +j30 Q…

A: In this question,  Predict the Wattmeter reading for the circuit in the figure below...

Q: In a 3-phase power measurement using two wattmeter method, if one wattmeter reads 2.5 times the…

A: Given: In a 3-phase power measurement using two wattmeter method, One wattmeter reads 2.5 times the…

Q: Three-3 ohms resistor are connected in the form of wye (Y). What is the e quivalent resistance of…

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Q: The power factor of the circuit shown in figure 2 is. a. 0.866 lagging  b. 0.5 lagging  c. 0.707…

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Q: Two 60 cycle currents having maximum values of 20 and 30 A differ in phase by an angle of 75…

A: Two 60 cycle currents having maximum values of 20 and 30 A differ in phase by an angle of 75…

Q: An inductor of 0.3 H and resistance 60 ohms is connected between each line and the neutral of 50 Hz…

A: In this question, we need to determine the current in each line and total power by the system. We…

Q: For the following circvit answer the quest + Ve E= 10 V/EO Tar

A: Since you have asked multiple questions in a single request, we will be answering only the first…

Q: Consider the following balanced three-phase system. Determine vi(t) and i2(t). j0.102 V₁ = 100/0°V…

A: Three phase balanced system:Since all impedances are equal then Delta to star transformation:- Star…

Q: 5 mV + Vie + WW. 250vbe e + M U 8.

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Q: Determine the power factor of the source. R = 6 Ohms

A: The given circuit diagram is shown below,Here, the value of R is 6 ohms.So,

Q: Find the equivalent resistance seen by the generator 10v. 50 50 10V 30요 122 V. 72 Select one: a. Req…

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Q: A three-phare a Hernator 2500 kW at L.2 kV and a vepplies had of of of 0.7. Amning the armatve pouer…

A: The solution can be achieved as follows.

Q: Each load on the left is 25.1972+j240.0237 ohms. Voltage source is 230V line. Use two wattmeter…

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Q: Use phasor diagram of alternator in leading p.f. (figure 2-b in this lecture) to derive the fomula…

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Q: Explain this delta connected balanced load

A: In this question,  We need to explain delta connected balanced load.

Q: 1. In a two wattmeter method used for measuring 3 phase power each wattmeter reads 200 kw ± 2% and…

A: Given Data:Two watt meters used for measuring 3-phase powerWattmeter 1 reads 200 kW ± 2%Wattmeter 2…

Q: The load in the circuit shown absorbs 50 kVA of complex power at power factar pf = 0.83 lagging when…

A: In this question we will find power factor at source with given data..

Q: Three identical impedances each having a resistance R and a capacitance C are connected in star…

A: Given, V=400Vf=50HzW1=800WW2=2000W

Q: Find the complex Fourier Series for periodic extension of: x(t) = 2sin(t) cos(t) For 0 < t <…

A: The signal is: The signal can be written as follows:

Q: Three single phase loads are connected to the 400 V, three phase lines, 60 Hz. Load 1 operating at 3…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: Consider a delta modulation (DM) system used to transmit a voice signal, which is uniformly sampled…

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Q: Q4- Calculate the voltage between "a" and "b" using Thevenin's theorem. 562 jsa -102 HH -jsn 80/60°…

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Q: The resistance in each phase of the load when the load power factor 0.8 is: 24 A R 120 V R wwm R L

A: Given load power factor =0.8 P=3VPLIPLcosΦ   =3×120×24×0.810   =6912 wpower consumed by phase one…

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.