Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 39, Problem 12SQ
To determine
Choose the correct option to find the location of the armortisseur windings.
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A separately excited generator has no-load voltage of 125V. A certain load rated at 1200W, 120V is then connected at the terminal. Calculate the series resistance needed to connect to the armature circuit in order for the load to operate at rated condition if the armature resistance is 0.0692Ω.
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Chapter 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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- - Define AC Generator - Why does DC excitation is used rather than AC excitation? - How does number of field poles and prime mover speed affect the frequency of EMF generated in armature?arrow_forwardThe relationship between field current and induced armature voltage is known as open circuit characteristic of a DC machine True Falsearrow_forward111/ The armature reaction of the DC generator reduces the generated EMF. Select one: True Falsearrow_forward
- 6/ What are the parameters required for the internal characteristics of the DC Generator? a. Terminal voltage (V) and Field current (If) b. Generated EMF (Eg) and Armature current (Ia) c. Terminal voltage (V) and load current (IL) d. Generated EMF (Eg) and Load Current (IL)arrow_forwardA 110V shunt generator has a full load current of 100A, shunt field resistance of 55 ohms and constant losses of 500W. If full load efficiency is 88%, find the armature resistance. Assuming voltage to be constant at 110V, calculate the efficiency at half load. Find the load current.arrow_forwardA 4 pole DC shunt generator with 400 wave connected armature conductors running at 975 rpm supplies a load of 10 ohm resistance at terminal voltage of 220 volt. The armature resistance is 0.25 ohm and the field resistance is 110 ohm. Find the armature current, induced emf and the flux per pole.arrow_forward
- A shunt generator has a field resistance of 60 ohms. When the generator driven 6KW, the terminal vtage is 125 Volts, while the generated emf is 133V. Determine a.) The armature resistance, and b.) The generated emf when the output is 2KW at terminal voltage of 135 V.arrow_forward- Define the different types of AC Generator. - Define Three- Phase AC Generator. - Why does DC excitation is used rather than AC excitation? - How does number of field poles and prime mover speed affect the frequency of EMF generated in armature? * Precise and not Hand Writtenarrow_forwardDiscuss with aid of diagrams and equations the effect of armature reaction on the generated voltage in a dc shunt generatorarrow_forward
- A short shunt compound DC generator supplies a load current of 10A at a voltage of 10 volts. If the resistance of armature, shunt field and series field windings are 0.001 ohm, 1 ohm 0.00 ohm respectively. a) Draw the the figure. And find the generated voltage.arrow_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_forwardThe armature resistance of a 50 KW, 240 V foreign excited generator is 0.02 ohms. Generator Rated voltage is met at rated load. Armature voltage and armature current at rated load calculation? If the output voltage is kept constant at 240V and the output power is reduced to 45 KW. Find the armature voltage required for this?arrow_forward
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