### Practical ApplicationsYou are working as an electrician in a large steel manufacturing plant, and you are in the process of doing preventive maintenance on a large DC generator. You have megged both the series and shunt field windings and found that each has over 10 MΩ to ground. Your ohmmeter, however, indicates a resistance of 1.5 Ω across terminals S1 and S2. The ohmmeter indicates a resistance of 225 Ω between terminals F1 and F2. Are these readings normal for this type of machine, or is there a likely problem? Explain your answer.

In the DC generator machine, there are two windings. the first winding is series winding which is in…

ou are working as an electrician in a large steel manufacturing plant, and you are in the generator. You have megged both the series and shunt field windings and found that each has over 10 MS2 to ground. Your ohmmeter, however, indicates a resistance of 1.5 2 across terminals S, and S,. The ohmmeter indicates a resistance of 225 N between terminals F, and F. Are these readings normal type machine, or is there a likely problem? Explain your answer. - process of doing preventive maintenance on a large DC for this

ou are working as an electrician in a large steel manufacturing plant, and you are in the generator. You have megged both the series and shunt field windings and found that each has over 10 MS2 to ground. Your ohmmeter, however, indicates a resistance of 1.5 2 across terminals S, and S,. The ohmmeter indicates a resistance of 225 N between terminals F, and F. Are these readings normal type machine, or is there a likely problem? Explain your answer. - process of doing preventive maintenance on a large DC for this

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...

See similar textbooks

Similar questions

Suppose there is a load that needs 120W of power and is located 50ft from a generator with a total resistance of 0.2525 Ohms. The load can be designed to operate at 12V or 120V. Find the voltage drop and power losses in the connecting wire for each voltage and comment on the results.
For a magnetic circuit, on no-load condition, core loss is, PC = 16 W; apparent power, (VA)rms = 20 VA, E1 = 275 V, N=200 turns. Assuming a s sinusoidal flux waveform, find: 1- Power factor, 2- Iron current, Ic 3- Magnetizing current, Im. Explain the followings:
for a 20kW PM synchroneous generator that produces 400V and 50A at its output. the resistance of the coil is 217.412 micro ohms. area of the magnetic feild is is 0.146 squared meter. it has a magnetic flux density of 1.49T, a frequency of 50Hz. Calculate the iron losses of this generator with no load. show all working Please answer in short like it definitely don't reject in shorts please... ..
The DC shunt generator with the terminal voltage 375 V, armature drop 7 V and the each brush drop 2 V, then the value of generated emf is
8. The two winding transformer and the autotransformer of the circuit shown in Figure are ideal. Determine the conducting and transformed currents of auto transformer. N1=200 NBC=20 N2=100 NBA=30 10A B 200 V 50,Hz N1 : N2 lellll
The strength of the rotating magnetic field in a three phase induction motor is equal to times the flux produce ...... ....... in one of the phase windings. 1.25 1 O 1.5
Question three: A single phase, 4600/460 V, 60 Hz, transformer is connected to a 60 Hz, 4600V power supply. The maximum flux density in the core is 0.85 T. If the induced voltage per turn in 10V, determine (a) The primary turns (N1) and the secondary turns (N). (b) The cross-sectional area (A) of the core.
The primary ofa certain transformer takes 1 A at a power factor of 0.4 when connected across a 230 V, 50 Hz supply and the secondary is on open circuit. The number of turns on the primary is twice that on the secondary. A load taking 50 A at a lagging power factor of 0.8 is now connected across the secondary. Sketch, and explain briefly, the phasor diagram for this condition, neglecting voltage drops in the transformer. What is now the value of the primary current?
3. A d.c. generator generates an e.m.f. of 520 V. It has 2,000 armature conductors, flux per pole of 0.013 Wb, speed of 1200 r.p.m. and the armature winding has four parallel paths. Find the number of poles. Subject: Electrical Machine 1
A lap-winding DC machine has 24 coils, 18 turns per coil, and 4 poles. The average flux density per pole is 1T. The effective length is 40 cm and the armature radius is 10 cm. The armature velocity is 140.2 rad/sec and the armature current is 24 A. The average flux per pole in Wb is: 6.283 0.06283 O 0.6283 0.006283
A D.C. shunt wound generator running at constant speed generates a voltage of 120V at a certain value of field current. When flux is reduced by 10% calculate the new value of flux Estimate the change in the generated voltage when the field current is reduced by 10%, assuming the flux is proportional to the field current.
7. A 4-pole machine running at 1500 r.p.m. has an armature with 90 slots and 6 conductors per slot. The flux per pole is 10 mWb. Determine the terminal e.m.f. as d.c. Generator if the coils are lap-connected. If the current per conductor is 100 A, determine the electrical power. Subject: Electrical Machine 1