For a 3-phase ac device, full load current is 40A, line voltage is 450V and reactance value is 0.062, then percentage reactance of this device is O 0.533 % O 0.307 % O 6% O 0.923 % from generating station is calcu
Q: connected alternator has a resistance of 0.075 2 per phase. Estimate the regulation for a load of…
A: This question is from "Electrical Machine". Under which we are going find out voltage regulation at…
Q: Across what direct emf must an impedance coil having a resistance of 20 ohms and an inductance of…
A: given parameters are as follows.
Q: 3. A series AC circuit consisting of R = 20 N, L = 10 mH and 2 µF are connected across V = 10 VL0°,…
A:
Q: 22 CS Scanned with CamScanner
A:
Q: 6. A 3-phase, star-connected alternator has a resistance of 0.52/phase and a synchronous reactance…
A: R=0.5 Ω/phaseXs=5 Ω/phaseEf=6600 VI=130 A Find: Vt=?VR=?
Q: A 415 V, 55 Hz 3-phase supply is connected to a 3-phase star connected balanced R-L load each of…
A:
Q: (a) Compare currents, i between DC and AC mode for the circuit as shown in Figure 1 (a). [Bandingkan…
A:
Q: II. Problem Solving A 400 resistor is connected in parallel to a coil having a resistance of 102 and…
A: We need to find out current for given circuit
Q: Q27/ (b) Three Impedances each of (10 – j18)Ω are connected in mesh across a three-phase 425V ac…
A: Given Supply line voltage Vline=425 V Z1=10-j18 ΩZ2=10-j18 ΩZ3=10-j18 Ω The phase voltage is,…
Q: 43. A series circuit consisting of a 50-ohm resistor, 0.5-henry inductor and a 100-microfarad…
A: In this question, RLC are connected in the series. Apperent power S= VI* We know S= P+jQ Where Q…
Q: step up chopper operating with a frequency of 10kHz. The source voltage is 50V and load voltage is…
A: Since you have asked multiple questions in a single request, we will be answering only the first…
Q: Two single-phase alternators are connected to a 50-Hz bus-bars having a constant voltage of 10 ∠ 0o…
A: Bus bar frequency, f = 50 Hz Bus bar voltage, V = 10 ∠0° kV Generator A induced e.m.f, EA = 13…
Q: 1. A series AC circuit consisting of L = 10 mH, R = 20 2, and C = 2 µF are connected across V = 10…
A:
Q: • Choose the correct answer: 1. These substations are usually located at the generating stations a)…
A: In a power system, power generated in power station is to be transmitted to load(consumers). When…
Q: A three-phase supply is generated, when the three coils are placed in 120 degree apart. Select one:…
A: Three phase supply is produced when three coils are positioned at 120 degree apart in a piulsating…
Q: 72. In 132 kV system, the phase to ground capacitance is 0.01 µF and inductance is 6H. The voltage…
A:
Q: Question: For the basic chopper circuit Edc= 50 V, R= 80 ohms, duty cycle is 30% then the average…
A:
Q: A 400 V, 50 Hz three phase balanced source ripples to a star connected load whose rating is…
A:
Q: Two power system areas operating at a nominal frequency of 60 Hz are connected with a tie line, and…
A:
Q: 6. A 2000KVA, 3300V, 3-phase star -connected altemator delivers rated load at a P.F. of…
A: For an electrical machine efficiency is a very important parameter it tell us about how much power…
Q: impedance 48-j54 N. Using Smith Chart calculate the following: i. VSWR ii. ii. Load Admittance YL.
A: Given that Z0=60 ohmZL=48-j54 ohm Although reflection co-efficient is given by Voltage reflection…
Q: Three single-phase transformers are connected into a three-phase bank. The primary is connected as a…
A: In this question we need to find a phase voltage of primary.
Q: The single phase AC sinusoidal current i=/2 I sin(wt+ 0) then the peak value of the current is Ims O…
A: Given: i=2I sin(wt+θ)i=Imsin(wt+θ) Im = peak currentPeak current =2I Option D
Q: A synchronous motor is fed by a phase voltage source of 254 V and has synchronous reactance of 3…
A:
Q: A three-phase generator is connected to three 90 Q load resistors. Each coil generates 120 V ac. A…
A: We need to tell the current value through the neutral line.
Q: For a 3-phase ac device, full load current is 40A, line voltage is 450V and reactance value is…
A:
Q: 415 V, 54 Hz 3-phase supply is connected to a 3-phase star connected balanced R-L load each of…
A:
Q: Q1/ A single phase AC distributor supplies two single phase loads as shown. What is the voltage drop…
A:
Q: A three-phase generator is connected to three 90 Q load resistors. Each coil generates 120 V ac. A…
A:
Q: Three phase alternators are invariably connected in star so as to a. Reduce the size of stator…
A:
Q: A single phase alternator has a rated output of 500 KVA at a terminal voltage of 3300 V. The stator…
A:
Q: A 415 V, 56 Hz 3-phase supply is connected to a 3-phase star connected balanced R-L load each of…
A:
Q: Compared to three-phase machines (for the same rated capacity), single phase machines have O higher…
A: As per the guidelines, we supposed to answer one question at a time so please ask other questions…
Q: A 415 V, 56 Hz 3-phase supply is connected to a 3-phase star connected balanced R-L load each of…
A: To find the value of inductance L in each phase
Q: An 11 kV generating station has four identical 3-phase alternators Gl, G2, G3 and G4 each of L0 MVA…
A: Here, Every generator is having a reactance of 0.12 Pu G1∥G2=0.12∥0.12=0.12×0.120.12+0.12=0.06…
Q: Chose the Substations do not change the Voltage Level Switching Substations O b. Converting…
A: We need to tell about the substations.
Q: (b) A symmetrical three-wire three-phase supply as shown in Figure Q2(b) is connected to a balanced…
A: “Since you have posted a question with multiple sub-parts, we will solve the first three sub-parts…
Q: Figure below shows a simple single-phase AC power system with three loads. The voltage source is V =…
A: Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question and…
Q: 64. A 50 Hz, 11 kV, 3-phase alternator with earthed neutral has a reactance of 5 ohms per phase and…
A: Given a 50 Hz, 11 kV, 3-phase alternator with, Earthed neutral has reactance, X=5 Ω. Distributed…
Q: A single-phase power system is shown in Figure 1. The power source feeds a 100-kVA 14000/2400V…
A: The answer as given below:
Q: 12. Refer to the circuit below. The alternator has a line voltage of 240 V and the load has an…
A: In this question, Star connect alternator is supplied to Delta connected load. Find the phase,…
Q: From the circuit below, determine secondary winding voltage Vsec if the primary winding voltage Vpri…
A:
Q: 14. In AC circuits, voltage and current are always in same phase. (a) True (b) False
A: IN AC circuit, voltage and current are always
Q: The reactance of a generator is given as 0.1 pu based on the generator of 17 KV, 300 MVA. Determine…
A: In this question per unit impedance given on some Mva and kv..We have to find new ou impedance on…
Q: By choosing the appropriate one among the 3-phase mains voltage, Vort=100V power electronics trigger…
A: (1) Since, it is not mentioned which circuit is needs to be drawn then drawing the three phase half…
Q: ings of a 40 kVA, 6 m respectively. The le- ate (i) the primary vol ced (ii) the full-load re
A:
Q: 72. In 132 kV system, the phase to ground ca- pacitance is 0.01 µF and inductance is 6H. The voltage…
A: Given a 132 kV system having, The phase to ground capacitance, C=0.01 μF Inductance, L=6 H…
Q: For a 3-phase ac device, full load current is 50A, line voltage is 400V and reactance value is…
A: Note: Since you have not specified any question to be answered, as per our honor code, we are…
Q: Question No.33 A single phase half bridge VSI has load R = 1.8 Q and DC source voltage 130 – 0 – 130…
A: Given a single phase half bridge VSI has, Load resistance, RL=1.8 Ω DC source voltage, Vdc=130-0-130…
Q: and inductance of 100mH is connected in a star with a 3-phase supply. The frequency is 50 Hz. Line…
A: The star connected load may have three wire or may have four wire as one wire is neutral. The…
Step by step
Solved in 2 steps with 2 images
- Figure 3.32 shows the oneline diagram of a three-phase power system. By selecting a common base of 100 MVA and 22 kV on the generator side, draw an impedance diagram showing all impedances including the load impedance in per-unit. The data are given a follows: G:90MVA22kVx=0.18perunitT1:50MVA22/220kVx=0.10perunitT2:40MVA220/11kVx=0.06perunitT3:40MVA22/110kVx=0.064perunitT4:40MVA110/11kVx=0.08perunitM:66.5MVA10.45kVx=0.185perunit Lines I and 2 have series reactances of 48.4 and 65.43, respectively. At bus 4, the three-phase load absorbs 57 MVA at 10.45 kV and 0.6 power factor lagging.With generator conyention, where the current leaves the positive terminal of the circuit element, if P is positive then positive real power is delivered. (a) False (b) TrueTwo balanced Y-connected loads, one drawing 10 kW at 0.8 power factor lagging and the other IS kW at 0.9 power factor leading, are connected in parallel and supplied by a balanced three-phase Y-connected, 480-V source. (a) Determine the source current. (b) If the load neutrals are connected to the source neutral by a zero-ohm neutral wire through an ammeter, what will the ammeter read?
- The total instantaneous power absorbed by a three-phase motor (under balanced steady-state conditions) as well as a balanced three-phase impedance load is (a) A constant (b) A function of timeConsider the balanced three-phase system shown in Figure 2.34. Deter mine v1(t) and i2(t). Assume positive phase sequence.A 60Hz, single-phase source with V=27730 volts is applied to a circuit element. (a) Determine the instantaneous source voltage. Also determine the phasor and instantaneous currents entering the positive terminal if the circuit element is (b) a 20 resistor. (C) a 10mH inductor, and (d) a capacitor with 25 reactance.
- Rework Example 3.12 for a+10 tap, providing a 10 increase for the high-voltage winding.A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)Does an open connection permit balanced three-phase operation? - (a) Yes (b) No
- In a balanced system, the phasor sum of the line-to-line voltages and the phasor sum of the line-to-neutral voltages are always equal to zero. (a) False (b) TrueWhich termination would result to a phase change of 180 degrees at the load if Zo = 100 ohm? a. 50 ohm b. short circuit c. 75 ohm d. all of these What is the purpose of impedance matching? a. maximum return loss b. maximum SWR c. maximum load power d. maximum reflection A short piece of transmission line that may be open or shorted and used for impedance matching purposes. a. converter b. decoder c. stub d. transformerTwo-three phase ac generators 1 and 2 are connected in parallel. The first generator has a per phase impedance of 5 ohms and 80 percent power factor lagging while the second one has a per phase current of 85 amperes and 82 percent power factor lagging. If the total apparent power is 277,459.88 bar angle of negative 35.972 degrees volt amperes, calculate the line to line voltage.