Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Question
Chapter 3, Problem 3.10P
(a).
To determine
The speed of the magnetic field rotation for the given set of poles at
(b).
To determine
The difference in the core losses of the motor running at
(c).
To determine
The reasons why there was separate 60Hz power system for lightning was adopted by early engineers.
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Chapter 3 Solutions
Electric machinery fundamentals
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Q2) In DC machine, the speed is 800 RPM, the flux per pole is 2 m wb, and it has a Lap winding armature with 6 coils (4 turns conductor per coil) . The DC machine has 2 poles and armature draws lc= 5.5 A. If the winding redesigned as wave winding, find the EA , Tem and Pem and explain what will happen when we change the design from lap to wave winding connection.arrow_forwardA 4 pole armature of a DC machine has 175 conductors and a flux per pole of 0.1 wb. Find the EMF generated when running at 600 rpm, when the armature is Lap wound.arrow_forwardAn 6 pole, lap connected armature has 500 conductors and its generated e.m.f is 120 V. If the machine is driven at 500rpm, then the flux per pole in Wb is,arrow_forward
- A thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. * O because it carries the load current. O to prevent mechanical vibrations. O to provide strength. O to produce large flux. The speed of a DC motor can be changed by varying - armature resistance circuit O flux per pole O voltage source O all of abovearrow_forwardAn 6 pole, wave connected armature has 520 conductors and its generated e.m.f is 125 V. If the machine is driven at 400 rpm, then the flux per pole in Wb is,arrow_forwardA 10 pole lap wound DC armature has a total of 200 conductors each with a current carrying capacity of 10 A. The average induced emf per conductor is 10 V. The power rating of the DC machine isarrow_forward
- The armature reaction of DC machines is less under no load condition. Select one: O True O Falsearrow_forwardUnder load in DC machines, the armature current will cause: a. Compensating Windings O b. Increase in the main flux Oc Armature Reaction O d. Interpolesarrow_forwardProblem-4, A field excitation of 20 A in a certain alternator results in an armature current of 400 A in short circuit and a terminal voltage of 2000 V on open circuit. What is the magnitude of the internal voltage drop within the machine at a load current of 200 A.arrow_forward
- Topic Electrical Machines - Magnetic & E... For a coil, each turn faces (2t4 – t³ – 2t) milliwebers of flux. The value of induced EMF in coil for 100 turns coil at 2 sec is, (in Volts).arrow_forwardA 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. *arrow_forward- Indicate whether the following statement are true or false True False In a dc machine for the same value of Z, N, 0 armature, e.m.f. is less with wave winding than with lap windingarrow_forward
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