Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Chapter 7, Problem 8TFQ
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3. A group of electromagnets that create flux in a d-c generator (the field circuit)
has an inductance of 18 henrys. If the 3.4 amp excitation is interrupted in 0.08 sec
by the opening of the field switch, what average voltage is induced in the winding?
Mention factors causing a permanent magnet generator not to generate emf
A DC generator has an armature emf of 500 V when useful flux/pole is 20 mWb, and a speed of 625 rpm.
The generated emf at a speed of 125 rpm and same flux is
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...
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- An ideal dc generator has regulation of 40% 20% O 30% Zeroarrow_forwardA permanent magnet dc motor has rotor radius of 1.3cm,magnetic thickness of 0.25cm and gap length of 0.05cm.The magnetic flux density in the motor isarrow_forwardShunt generator running at 1000 rpm, if flux is reduced by half, then what is the new speed 1000 r.p.m O 2000 r.p.m 500 r.p.m O Or.p.marrow_forward
- A magnetic circuit with a cross-sectional area of 20 cm? is to be operated at 50 Hz from a 120 V rms supply. The number of turns required to achieve a peak magnetic flux density of 1.8 T in the core isarrow_forwardA separately excited dc generator generates 230 V when driven at 1200 rpm of the field flux is decreased by 10%. What is the new emf with speed remains the same.arrow_forwardQuestion 4 To minimize the time where the voltage produced by a coil in the armature of a dc generator is zero, we minimize the A air gap B pole gap Question 5 A 6-pole dc generator with a simplex wave winding has parallel paths in its armature winding. Round your answer to 0 decimal places. Add your answerarrow_forward
- 4-ls the residual magnetism on the generator is necessary how can you cancel these residual magnetism in D.c generatorarrow_forwardc. Compare the characteristics of the following types of generators Separately excited generators Series wound generators Shunt wound generatorsarrow_forwardThe shunt DC generator gives almost O Constant current O None of these O Constant voltage O Constant current and voltagearrow_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_forwardArmature winding of an alternator can also be described asarrow_forward4. 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 Currentarrow_forward
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