10.9 A 2 MVA, 3.3 kV, 3-phase, star-connected Alternator delivers full-load at 0.8pf lagging and at rated voltage. The effective resistance per phase is 0.15 2. Thefield circuit takes 68 A from 230 V DC supply. Mechanical and iron lossesaccounts for 16 kW and 34 kW respectively. Determine the efficiency of theAlternator at this load condition. [Ans: 92.98%]

Answered: 10.9 A 2 MVA, 3.3 kV, 3-phase,…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Similar questions

The step down DC chopper uses DC source voltage V(dc) = 200 V and resistive load impedance of 10 ohm. The duty cycle is 0.4 the voltage drop across the switch may be taken as zero, Calculate : (a) Average and RMS value of output voltage. (b) Average and RMS value of output current.
The voltage regulation of an alternator having 0.75 leading p.f. load, no-load induced e.m.f. of 2400V and rated terminal voltage of 3000V is............... percent. *
v. With reference to an 50 Hz3 phase alternator explain how P,Q,V and F are controlled.
A three phase star connected alternator gives 575 V on open circuit when the field current is 10 A. For same field current, a full load current of 75 A is observed on short circuit. The armature resistance between terminals is 2.16 ohms. On 0.8 leading power factor of full load condition, induced emf per phase is 6000 V. Find its rated terminal voltage between the lines. Also calculate kVA rating of the alternator.
A 60 Hz, 33 kV, 3-phase alternator with earthed neutral has a reactance of 7 ohms per phase and is connected to a bus-bar through a circuit breaker. The distributed capacitance upto circuit breaker between phase and neutral in 0.03 uF. Determine (i) peak re-striking voltage across the contacts of the breaker (ii) frequency of oscillations
Two identical, 3-phase, Y-connected alternators A and B share equally a load of 10MW at 33kV at 0.8pf lagging. The synchronous reactance of each machine is 4 ohms per phase and the armature resistance is negligible. Alternator A has its field excitation adjusted to carry 125A lagging current. What is the current supplied by alternator B?
A single phase, 2000 V alternator has armature resistance and reactance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 A load at 0.8 leading power factor is ??
A three-phase, wye connected alternator is rated at 720 kVA, 2400 V, 60 Hz. At the rated load, determine: the output, in kilowatts, at 80% lagging power factor. the full-load line current. the full-load current rating of each of the three windings. the voltage across each winding
3.
Kindly solve the problem with step by step complete solution. Also, put the given and formula used so that I can understand. Thank you. A 2200V, 60 Hz, three-phase, Y-connected alternator has an effective resistance per phase of 0.5 ohm. A field current of 30A produces a full load current of 200A on short circuit and a line-to-line emf of 1100 V on open circuit. Determine the power angle of the alternator when it delivers full load at .80 lagging pf.
A 1200 kVA, 6600 volt, 3-phase, Y-connected alternator has an effective resistance of 0.40 ohm and a reactance of 6 ohms per phase. It delivers full load current of 0.80 lagging power factor at rated voltage. What will be the terminal voltage for the same excitation and load current if the power factor is 0.80 leading? a. 4,560 V b. 9.878 V c. 7.898 V d. 4,250 V Choose the letter of the correct answer. Show your solution.
9.4 A 3-phase, 16-pole, Alternator has a star-connected winding with 144 slots and 10 conductors per slot. The flux per pole is 0.03 Wb sinusoidally distributed and the speed is 375 rpm. The winding is short chorded by 1 slot. Calculate the no-load terminal voltage. [Ans: 2617.9]

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