5. A 3-phase, 16-pole alternator has a star-connected winding with 144 slots and 10 conductors The flux per pole is 30 mWb sinusoidally distributed. Find the frequency, the phase and line voltage if the speed is 375 rpm. 6. A synchronous generator has 9 slots per pole. If each coil spans 8 slot pitches, what is the value of the pitch factor ? per slot. [50 Hz; 1530 V; 2650 V] (Electrical Machines-I, Indore Univ. April 1977) [0.985] (Elect. Machines, A.M.I.E. Sec. B. 1989)

5. A 3-phase, 16-pole alternator has a star-connected winding with 144 slots and 10 conductors The flux per pole is 30 mWb sinusoidally distributed. Find the frequency, the phase and line voltage if the speed is 375 rpm. 6. A synchronous generator has 9 slots per pole. If each coil spans 8 slot pitches, what is the value of the pitch factor ? per slot. [50 Hz; 1530 V; 2650 V] (Electrical Machines-I, Indore Univ. April 1977) [0.985] (Elect. Machines, A.M.I.E. Sec. B. 1989)

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

What conditions must be met before two alternators can be paralleled together?
QI/ Caleulate the voltage per phase for a 3-phase 1500 rpm, 4-pole alternator having a 16 conductors per slot connected in two layers. The slots per pole per phase are 8 and the coil span is 20 slots. The phase spread is 60° and the flux per pole is 25-8 x 1o weber.
Q1/ Calculate the voltage per phase for a 3-phase 1500 rpm, 4-pole alternator having a 16 conductors per slot connected in two layers. The slots per pole per phase are 8 and the coil span is 20 slots. The phase spread is 60° and the flux per pole is 25-8 x 10 weber.
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.
Q1/ Caleulate the voltage per phase for a 3-phase 1500 rpm, 4-pole alternator having a 16 conductors per slot connected in two layers. The slots per pole per phase are 8 and the coil span is 20 slots. The phase spread is 60° and the flux per pole is 25-8 x 10 weber.
A three-phase, star-connected alternator has 8 number of poles, armature with 160 slots and 2 conductors per slot. The speed of rotation is 1000 rpm. The flux per pole is 0.06 weber. If the winding factor is 0.94 and all the conductors in each phase are in series. Calculate a) Frequency of generation b) Number of turns c) EMF generated (phase voltage) d) EMF generated (Line voltage)
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.
A 3-phase 4-pole alternator has a single layer full-pitch winding with 8 conductors per slot. The armature has a total of 36 slots. Determine the voltage between lines when the alternator is driven at 1800 rpm with a flux of 0.05 Wb per pole.
There are 72 slots in a 3-phase, 8-pole, 50 Hz, star connected alternator. There are 2 conductors in each slot and all the conductors in a phase are connected in series. Coil span is 150° electrical and the flux per pole is 0.05 Weber sinusoidally distributed. Calculate the emf induced per phase.
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
7. A 3-phase, Y-connected, 2-pole alternator runs at 3,600 r.p.m. If there are 500 conductors per phase in series on the armature winding and the sinusoidal flux per pole is 0.1 Wb, calculate the magnitude and frequency of the generated voltage from first principles. 8. One phase of a 3-phase alternator consists of twelve coils in series. Each coil has an r.m.s. voltage of 10 V induced in it and the coils are arranged in slots so that there is a successive phase displacement of 10 electrical degrees between the e.m.f. in each coil and the next. Find graphically or by calculation, the r.m.s. value of the total phase voltage developed by the winding. If the alternator has six pole and is driven at 100 r.p.m., calculate the frequency of the e.m.f. generated. [60 Hz; 11.5 kV] [ 108 V; 50 Hz]
Calculate the voltage per phase for a 3-phase 1500 rpm, 4-pole alternator having a double layer winding with 16 turns per coil. The slots per pole per phase are 8 and the coil span is 20 slots. The phase spread is 60° and the flux per pole is 25.8x10−3 weber.