Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Question
Chapter 7, Problem 7TFQ
To determine
Whether the given statement is true or false.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A separately excited DC generator has six poles and is running at 1150 rpm. The armature has 120 slots with 8 conductors per slot and is connected as wave winding. The generated voltage in each conductor is 1.5 V and each conductor can carry a full load current of 4 A. What is the output power?
4. An a-c generator has six poles and operates at 1,200 rpm.
(a) What frequency does it generate?
(b) At what speed must the generator operate to develop
25 cycles? 50 cycles?
(c) How many poles are there in a generator that operates at
a speed of 240 rpm and develops a frequency of 60 cycles?
()
-I Cycle-
(0) Two poles - one cycle per revolution.
N
N
-2 Cycles
(A Four poles-two cycles per revolution.
AN LS ANA LEJ ANA LSJ
-3 Cycles
(c) Six poles -three cycles per revolution.
Sketch illustrating the relation between
the number of poles and the generated a-c
frequency in cycles per revolution.
Current
Current
Current
4-ls the residual magnetism on the generator is necessary
how can you cancel these residual magnetism in D.c
generator
Chapter 7 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 7 - The tesla (T) and the gauss (G) are both units for...Ch. 7 - The unit for measuring magnetomotive force (mmf)...Ch. 7 - Ohm’s law for a magnetic circuit gives the...Ch. 7 - A solenoid is a form of electromagnetic switch...Ch. 7 - A hysteresis curve is a plot of flux density (B)...Ch. 7 - To produce an induced voltage in a coil, the...Ch. 7 - Prob. 7TFQCh. 7 - Prob. 8TFQCh. 7 - Prob. 9TFQCh. 7 - Prob. 10TFQ
Ch. 7 - Prob. 1STCh. 7 - Prob. 2STCh. 7 - Prob. 3STCh. 7 - Prob. 4STCh. 7 - Prob. 5STCh. 7 - Prob. 6STCh. 7 - Prob. 7STCh. 7 - The electromagnetic activation of a movable shaft...Ch. 7 - When there is current through a wire placed in a...Ch. 7 - Prob. 10STCh. 7 - Prob. 11STCh. 7 - Prob. 12STCh. 7 - Prob. 13STCh. 7 - Prob. 14STCh. 7 - Prob. 15STCh. 7 - The cross-sectional area of a magnetic field is...Ch. 7 - In a certain magnetic field the cross-sectional...Ch. 7 - Wha is the flux in a magnetic material when the...Ch. 7 - At a given location, the earth’s magnetic field...Ch. 7 - A very strong permanent magnet has a field of...Ch. 7 - Prob. 6PCh. 7 - What is the relative permeablility of a...Ch. 7 - Determine the reluctance of a material with a...Ch. 7 - What is the magnetomotive force in a 500 turn coil...Ch. 7 - Typically, when a solenoid is activated, is the...Ch. 7 - Prob. 11PCh. 7 - Explain the sequence of events in the circuit of...Ch. 7 - Prob. 13PCh. 7 - What is the magnetizing force in Problem 9 if the...Ch. 7 - How can the flux density in Figure 7-51 be changed...Ch. 7 - In Figure 7-51, determine the following if the...Ch. 7 - Determine from the hysteresis curves in Figure...Ch. 7 - According to Faraday’s law, what happens to the...Ch. 7 - The voltage induced across a certain coil is...Ch. 7 - Prob. 20PCh. 7 - A 20 cm long conductor is moving upward between...Ch. 7 - Prob. 22PCh. 7 - If a generator is 80% efficient and delivers 45 W...Ch. 7 - Prob. 24PCh. 7 - If the output voltage in Problem 24 is 14 V, what...Ch. 7 - Prob. 26PCh. 7 - Prob. 27PCh. 7 - A basic one-loop de generator is rotated at 60...Ch. 7 - Assume that another loop of wire. 90 from the...
Knowledge Booster
Learn more about
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
- how does the rotor of a 3-phase induction motor get power a- through brushes and commutador segments b- through brushes and slip ring c- indution from the stator d- none of the abovearrow_forwardAn ideal dc generator has regulation of 40% 20% O 30% Zeroarrow_forwardThe shunt DC generator gives almost O Constant current O None of these O Constant voltage O Constant current and voltagearrow_forward
- Q- In a DC generator, what will be change in emf induced if flux is reduced by 20% and the speed is increased by 20%.arrow_forwardc. Compare the characteristics of the following types of generators Separately excited generators Series wound generators Shunt wound generatorsarrow_forwardIf residual magnetism of a shunt generator is destroyed due to any reason, it may be restored by connecting its shunt field O to an AC source O to a DC source O to neutral O to eartharrow_forward
- A basic one-loop dc generator is rotated at 60 rps. How many times each second does the dc output voltage peak (reach a maximum)?arrow_forwardA 6 pole DC lap wound generator has 34 armature conductors with flux per pole is 48 mWb and the e.m.f generated is 55 V, then the speed of the machine is 4.29 rps 0.43 rps 33.70 rps 33.70 rpsarrow_forwardDC shunt generator may fail to generate in the case of O Small resistance Existence of frequency Absence of residual flux High speedarrow_forward
- a 6-pole DC generator has a simplex lap-wound armature containing 288 coils of 10 turns each. The resistance of each turn is 0.01 Ω. The flux per pole is 0.006 Wb.arrow_forwardThe strength of the rotating magnetic field in a three phase induction motor is equal to times the flux produce ...... ....... in one of the phase windings. 1.25 1 O 1.5arrow_forwardThe voltage induced in 8 poles lamp wound generator is 120 V with armature resistance = 0.3 2. What will be the terminal voltage at a load = 3.6 A when the machine is rewound as a wave?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Single Phase Induction Motor, How it works ?; Author: Lesics;https://www.youtube.com/watch?v=awrUxv7B-a8;License: Standard Youtube License