A 50kVA, 550V single phase alternator draws a field current 10A at rated load. With the same field current, the open circuit emf and shirt circuit current are 300V and 150A. The ohmic resistance of the armature between terminals is 0.18Ω. The ratio of effective to ohmic resistance may be taken as 1.5. Determine the terminal voltage at 0.8 pf factor lagging. Use two decimal places.

A 50kVA, 550V single phase alternator draws a field current 10A at rated load. With the same field current, the open circuit emf and shirt circuit current are 300V and 150A. The ohmic resistance of the armature between terminals is 0.18Ω. The ratio of effective to ohmic resistance may be taken as 1.5. Determine the terminal voltage at 0.8 pf factor lagging. Use two decimal places.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter31: Three-phase Alternators

Section: Chapter Questions

Problem 1RQ: What conditions must be met before two alternators can be paralleled together?

See similar textbooks

Similar questions

3. Two circuit elements in series consume 60 VAR when connected to a 120 – V, 60 – Hz source. If the reactive factor is 0.6, what are the two components and what are their values?
3-9 An rms ac voltmeter and a peak-to-peak-reading ac voltmeter are to be used to determine whether three ac signals are sinusoidal. Deter. mine whether the signals are sinusoidal if the following readings are obtained First signal Second signal Third signal peak-to-peak reading = 35.26 V rms reading. - 12.00 V peak-to-peak reading - 11.31 V rms reading = 4.00 V peak-to-peak reading = 25.00 V rms reading -8.83 V
6. What is the effect of load inductance on the ripple current? 7. i effect of chonnine Bock and boost 8. Wh 9 What chopping 10. At what duty evcle does the load current rinnle current he
An alternating current varying sinusoidally with a frequency of 50 Hz has anrms value of 20 A.a) Determine the instantaneous value at 0.0025 seconds.b) Determine the instantaneous value, 0.0125 seconds after passingthrough a positive maximum value.c) At what time, measured from a positive maximum value, will theinstantaneous current be 14.14 A?
Find the rms value of the induced emf per phase of a 10 pole, three phase, 50 Hz alternator with 2 slots per pole per phase and 4 conductors per slot in two layers. The coil span is 150°. The flux per pole is 0.12 Wb (a) 994 (c) 1020 53. (b) 864 (d) 960
The voltage generated across one inductor of an alternator is 8.11V. There are 120 slots and 4 turns in every coil. The conductors are all in series and connected in double layer lap windings distributed sinusoidally in several slots. The coil pitch is 10 slots, frequency is 60 Hz and synchronous speed is 720 rpm. Calculate the line-to-line generated voltage if the alternator windings are connected wye.
Problem (Homework): A single phase full wave AC voltage controller supplies a resistive load. The input RMS voltage is 120V at 60Hz. Determine the output RMS voltage when a is 0°, 90°, and 180º.
In capacitive AC circuit voltage is leading current O a. True O b. False
Calculate the voltage per phase for a 1500 rpm, 4 pole alternator having a double layer winding with 16 turns per coil. The slots per pole phase are 8 and the coil span is 20 slots. The phase spread is 60o and the flux per pole is 25.8 milli webers.
What is the average Power at maximum resistance? Why? What is the effect to the voltage and current when increasing the load resistance?
Draw the waveform of voltage and current under the following conditions: A current which lags the voltage by 60°. A current which leads the voltage by 60°. A current which is in phase with the voltage
A three phase, 50 Hz, 8 pole alternator has a star connected winding with 120 slots and 6 conductor per slot. The flux per pole is 0.05 Wb, sinusoidally distributed. Determine the phase and line voltages if the coil is full pitched.