1.The synchronous generator of Fig.1 is driven by a speed-governed prime mover.(a) Draw the phasor diagram.If the field current, I, was increased by 10%,(b) Draw the phasor diagram.(c) Predict the qualitative changes in E,.(d) Predict the qualitative changes in VanMIFig.1"R1.V.XL" (a)аEQЕкEf@ 49'I'вия-

Step 1: Step 2: Step 3: Step 4:

Answered: 1.The synchronous generator of Fig.1 is…

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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a) A sinewave is having a frequency of 50 Hz and instantaneous value of 250 Volts at 1.5 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and ii) The value of voltage at 1.8 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp%3D200 Volts, Time period is 20 milli seconds and =50 degrees. Vp Ф Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximum value = a) (ii) Value of voltage at 1.8 ms = b) Angular frequency =
H.W Q1: In your own words, explain how the galvanometer works? Q2: In your own words, what are the cases of dynamic behavior of PMMC?
Real Power Versus Voltage curve may be used to assess the a.Steady state voltage stability b.Loading of that particular AC Generator c.Dynamic voltage stability d.Complete Voltage stability 2- kinetic energy stored in the rotor of a synchronous alternator is given by a.G * H * w b.m * a c.0.5*m*v*v d.S * H
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(c)[ device needs to connect to a Diesel generator which generates sinusoidal AC power at 16.67 Hz. The amplitude or RMS value of the generator output voltage is adjustable. The area of cross-section of the core is 0.035 m². What constraints, if any, must be imposed on the The magnetic device of the figure is designed to operate with 240 V(rms) at 50HZ. For operation in a remote mining site, the use of this device, or the generator, if the device must be connected to the generator. You may assume that the peak B field in the core must be limited to 1.1 T to prevent magnetic saturation.
The field winding of a.d.c. machine takes a steady current of 10A when connected to a d.c. source of 230 volts.On, switching the voltage to the field, it is observed that it takes o.3 second to reach 5 A. (i) Find the value of inductance of the field winding. (ii) Find also the time for the current to fall to 30% of the final steady value if the field terminals are short - circuited.
Show that an alternator running in parallel on constant-voltage and frequency bus-bars has a natural time period of oscillation. Deduce a formula for the time of one complete oscillation and calculate its value for a 5000-kVA, 3-phase, 10,000-V machine running at 1500 r.p.m. on constant 50-Hz bus-bars. The moment of inertia of the whole moving system is 14,112 kg-m2 and the steady short-circuit is five times the normal full-load value. ANSWER IS [1.33 second]
Solve Q4 and Q5 only
If the prime mover torque suddenly falls by a considerable amount, the damperwinding of the alternator witnesses the flow of a massive current through it, which further opposes the prime mover torque.True or False Subject Electrical Engineering Sub-subject Search And Select
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Maz a) A sinewave is having a frequency of 50 Hz and instantaneous value of 250 Volts at 1.3 milli seconds. Find D The maximum value of sinusoidal voltage waveform and i) The value of voltage at 2.1 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 10 milli seconds and 0 =40 degrees. on Vp Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximnum value = a) (ii) Value of voltage at 2.1 ms = b) Angular frequency =
from 1 to 3

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