Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 4, Problem 4.4Q
Sketch the phasor diagrams and magnetic field relationships for a synchronous generator operating at (a) unity power factor, (b) lagging power factor, (c) leading power factor.
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Draw a complete phasor diagram of a single-phase synchronous generator at a general unity power factor. Draw also the equivalent circuit of the generator. Phase resistance must be included in the phasor diagram.
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- The power factor of a 3-phase, star-connected, salient-pole synchronous generator is ignored by the armature winding resistance;a) 0.8 inductiveb) 0.8 capacitivec) 1 ohmicDraw the phasor diagrams for the values.arrow_forward(use 2-decimal digits for solutions) 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.arrow_forwardTwo 30 AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductors per slot in big generator in K times that of the smaller one. The value of K to get equal no-load voltage at same frequency is (a)8 (b) 8 1 (d) 7 (c) 4arrow_forward
- The standard practice of synchronous generator construction now a days is to have Cylindrical field Rotating armature Either of the above Rotating field In an alternator, the armature reaction influences the magnitude of No load loss Wave form of generated voltage. Speed of the machine Flux Terminal voltage per phasearrow_forwardA synchronous generator is connected to a pure capacitive load. The field excitation is kept constant and the stator resistance is assumed negligible. Explain, with the help of phasor diagram(s), how the generator’s terminal voltage will vary when the capacitive load is increased while the power factor is kept constant.arrow_forwardA 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.arrow_forward
- How does a synchronous generator operate, and what are its primary applications in power generation?arrow_forwardA long shunt compound generator delivers a current of 10A at 200V and has a series field resistance and shunt field resistance of 1 ohm and 200 ohms respectively. Then line current is a. 2A b. 1A c. 9A d. 10Aarrow_forward. When a self-excited compound DC generator supplies load, the terminal voltage is not the same as the generated emE Why? a) voltage drop across the armature resistance will reduce the voltage available at the load terminals b) where there is a series field, voltage drop across the series field resistance will reduce the voltage available at the load terminals c) both "a" and "b" d) neither "a" nor "b"arrow_forward
- Duestion. Explain sompound DC :- describe its generator types of also and terminal characteristics compound DC. generatorarrow_forwardmay be more than one answerarrow_forwardA 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.arrow_forward
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