A 4 pole,lap wound,dc. generators has 42 coils with 8 turns per coils. if is driven at 1120 rpm,if useful flux per pole is 21 mWb,calculate the generated e. m. f. Find the speed at which it isto be driven to generate same emf. as calculated above,with wave wound armature.

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Answered: 4 pole,lap wound,dc. generators has 42…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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A dc shunt generator delivers 50 kw at 250 v, its armature has a 4-pole wave winding with a resistance of 0.01 ohm and its field resistance is 125 ohm. if the number of turns in the armature is 201 and the flux per pole is 0.02 wb, find the voltage generated and the speed of operation. *
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 %
Note: Please don't write by handwriting.
7 A three-phase, 60-cycle, 32-pole synchronous generator has a sinusoidally distributed air-gap flux of 0.025 weber/pole. The armature core has 324 slots. The armature winding is Y-connected. There are two coil sides per slot and two turns per coil. The coil pitch is 9 slots. Find the generated voltage between the line terminals. Ans. 2,445 V
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A 6 pole DC lap wound generator has 38 armature conductors with flux per pole is 42 mWb and the e.m.f generated is 78 V, then the speed of the machine is 48.87 rps O 3.87 rps O 0.39 rps O 48.87 rps When the load on a series generator is decreased, then the flux produced will be increased. Select one: O True O False
A 6 pole wave wound d.c. shunt generator has 500 conductors. A generator delivers 50 kW of power at 250 voltage at full load. The resistance of the field circuit is 125 2. Actual brush shift is 10°. Then find the demagnetizing and cross magnetizing ampere turns per pole and how many additional turns must be wound on each pole to eliminate the demagnetizing effect.
ASAP, answer now please..
An 8- pole dc generator has 500 armature conducters and a useful flux of 0.05 Wb. A. What will be the emf generated, if it is lap- connected and runs at 1200 rpm? B. What must be the speed at which it is to be driven to produce the same emf if it is wave wound.
Dc machine.............
Flux is exactly proportional to L2 times field current in a d.c generator. The generator operates at a speed of 200 revolutions per minute and has a flux of 30 mWb.f per pole. The generator is lap wound with 600 conductors in series; determine the e.m.f. produced. If the winding is wave wound, calculate the change in excitation current required to get the same voltage as previously stated. The machine has six poles.

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4 pole,lap wound,dc. generators has 42 coils with 8 turns per coils. if is driven at 1120 rpm, f useful flux per pole is 21 mWb,calculate the generated e. m. f. Find the speed at which it is be driven to gTenerate sa calculated above with wwave wound rmature