Example 8.11(b). A 4-pole lap-connected armature of a d.c. shunt generator is required to supply the loads connected in parallel : (1) 5 kW Geyser at 250 V and (2) 2.5 kW Lighting load also at 250 V. The Generator has an armature resistance of 0.2 ohm and a field resistance of 250 ohms. The armature has 120 conductors in the slots and runs at 1000 rpm. Allowing 1 Vper brush for contact drops and neglecting friction, find (1) Flux per pole, (2) Armature-current per parallel path. (Nagpur University Nov. 1998)

Example 8.11(b). A 4-pole lap-connected armature of a d.c. shunt generator is required to supply the loads connected in parallel : (1) 5 kW Geyser at 250 V and (2) 2.5 kW Lighting load also at 250 V. The Generator has an armature resistance of 0.2 ohm and a field resistance of 250 ohms. The armature has 120 conductors in the slots and runs at 1000 rpm. Allowing 1 Vper brush for contact drops and neglecting friction, find (1) Flux per pole, (2) Armature-current per parallel path. (Nagpur University Nov. 1998)

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

(a) A 4 pole generator with wave wound armature has 85 slots each having 10 conductors. The flux per pole is 26 mWb. At what speed must the armature rotate to give an induced EMF of 220V. (b) What will be the voltage developed, if the winding is lap connected and the armature rotates at the same speed
A 2MVA, 2.3kV three – phase Y – connected alternator operates at rated kVA at a power factor of 80%. The dc armature winding resistance between terminals is 0.08 ohm. The field takes 70 A at 125 V from an exciter equipment. Friction and windage loss is 20kW, iron losses 36kW and stray load losses are 2.0 kW. Calculate the efficiency of the alternator. Assume the effective armature winding resistance is 120% of the DC resistance. a. 94.0 % b. 92.1 % c. 93.2 % d. 89.5 %
Q8) A two-pole de generator has an armature containing a total of 40 conductors connected in two parallel paths. The flux per pole is 0.02 web, and the speed of the prime mover is 30 rpm. The resistance of each conductor is 0.01 ohm, and the current-carrying capacity of each conductor is 10 A. Calculate: (a) The average generated voltage per path and the generated armature voltage (b) The armature current delivered to an external load (c) The armature resistance (d) The terminal voltage of the generator.
A) Adding resistive loads in parallel to the output terminals of a series connected DC generator will the total load resistance. a) increase b) decrease c) either "a" or "b" d) neither "a" nor "b" B) Adding resistive loads in parallel to the output terminals of a series connected DC generator will the current through the field winding. a) increase b) decrease c) either "a" or "b" d) neither "a" nor "b"
A synchronous generator runs at 250 rpm and generates at 50-Hz. There are 216slots, each containing 5 conductors arranged in a full-pitched winding for 3-phasestar connection. All the conductors of each phase are in series and the flux perpole at no-load sinusoidally distributed over the pole pitch is 30 mWb. Find the emfinduced in each phase winding and the terminal voltage.
The reactance's of the alternator during the periods of steady state are given bellow, Leakage reactance(X)=0.18 ohm, and armature reactance (Xad) = 0.67 ohm. The value of the syncronous reactance during the steay state conditions is Syncronous Reactance in ohm
A 2 pole wave wound dc generator has 44 slots, each slot having 20 conductors. The flux/pole is 0.018 weber. At what speed the armature be rotated to get an induced emf of 220 V. What will be the induced emf developed if the armature winding is lap connected and runs at the same speed. Speed Generated Emf when lap connected
9.09 The flux density distribution in the air-gap of a certain generator is such that it contains a fundamental, a third harmonic, and a fifth harmonic. The flux per pole due to the fundamental distribution is 9 x 10-3 weber, that due to the third harmonic distribution is 0.9 x 10-3 weber, that due to the fifth harmonic distribution is 0.4 x 103 weber. There are four armature slots per phase per pole, the connection are made for three-phase wye. and the coil pitch is 12/15. The frequency is 60 cycles and the generator has 4 poles. (a) Calculate the emf/turn. (b) If there are six turns/coil and two coil sides/slot, calculate the emf per phase. (c) Calculate the emf between line terminals. Ans. 2.32V; 212V; 364V
A d.c. series generator supplies the load of 5 kW at 250 volts. The armature resistance and series field resistances are 1 ohm and 0.5 ohm respectively. Determine the value of the induced emf.
Two DC generators, each with armature resistance of 0.02 ohm and fieldresistance of 50 ohms run in parallel and supply a total current of 1000 amperesto the load circuit. If their emfs are 270 V and 265 V, their bus bar voltagewill be. [Ans. 267.5 V]
The shunt field winding of a shunt generator has a resistance of 80ohms at 20 degrees Celsius. After several hours of continuous operation, the winding temperature rises to 50 degrees Celsius. How much is the winding resistance under this condition. Assume the resistance temperature coefficient of copper to be 0.004 ohm per degree at 0 degree Celsius. *
1. A shunt generator supplies a load of 4,500 W at 120 V through a pair feeder conductors having a resistance of 0.02 ohm each. The armature, shunt field resistance are 0.20 ohm and 40 ohm respectively. Find emf generated. The i lon wound with 450 conductors.