Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 31, Problem 11RQ
To determine
What converts the AC produced in the armature winding into DC before it is supplied to the field winding when a brushless exciter is used.
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4
The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 is
short-pitched by ........... degrees.
150
40.
90
20
Brushless excitation system consisting of:
Stator field winding and power diodes
stator and rotor field winding and capacitor
stator and rotor field winding and power diodes
Everything mentioned in the options
Full Name : *
Chapter 31 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 31 - What conditions must be met before two alternators...Ch. 31 - How can the phase rotation of one alternator be...Ch. 31 - What is the function of the synchronizing lamps?Ch. 31 - What is a synchroscope?Ch. 31 - Assume that Alternator A is supplying power to a...Ch. 31 - What two factors determine the output frequency of...Ch. 31 - At what speed must a six-pole alternator turn to...Ch. 31 - What three factors determine the output voltage of...Ch. 31 - What are sliprings used for on a...Ch. 31 - Prob. 10RQ
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- Describe the characteristics and principles of operation of AC and DC generators and the features of a range of different types of power stations.arrow_forwardQ1. Calculate the voltage induced in the armature winding of a 4-pole, lap-wound DC machine having 500 conductors and running at 1,000 rpm. The flux per pole is 30 mWb.? What will be induced emf if the armature is rewound for wave winding? (Ans. 250 V; 500 V)arrow_forwardthe basic requirement of DC armature winding is that it must be: a) a closed one b) a lap winding c) a wave winding d) either (b) or (c)arrow_forward
- The resistance of the field winding(copper wire) of a DC machine is 0.25 ohm at 25°C. When operating at full-load, the temperature of the winding is 75 °C. The temperature coefficient of resistance of copper is 0.00427 per °C at 0°C. Find the resistance of the field winding at full-load.arrow_forward14/. The purpose of brushes in a dc machine is__________. to change ac to dc signal to remove the losses in machine to collect voltage from windings avoid spark for currentarrow_forwardDifferentiate the two types of armature windings in DC machines: lap winding and wave winding.arrow_forward
- The per phase dc armature resistance of an alternator is 0.5 0. The effective ac armature resistance would be about?arrow_forwardFirst question) Choose the correct a nswer for all characters a) In an alternator, the armature reaction influences the magnitude of Wave form of generated voltage. O Flux Terminal voltage per phase Speed of the machine No load loss b) Brushless excitation system consisting stator and rotor field winding and power diodes Stator field winding and power diodes stator and rotor field winding and capacitor Everything mentioned in the options O c) If input mech. Power of SG constant, :the functionality of AVR is Control terminal voltage O Control Load angle O Control flux and terminal voltage O Control flux of rotor d) What will happen if a stationary alternator (off) is connected to a live ?power system It is likely to run as a synchronous motor :of It will decrease bus bar voltage O It will get short circuited It will disturb generated e.m.f. of other paralleled alternators. e) The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 .is short-pitched by.............…arrow_forward1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turnarrow_forward
- what is the conclusion for the concepts of rotating amature and rotating field in an alternator?arrow_forwardHow to calculate the pitch factor of a 8 pole alternator with an armature wound coils having 18 / 24 fractioanl pitch. Can you please show the solution in details.arrow_forwardQ9 / What are the function of brushes , pole and commutator in DC machinearrow_forward
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