Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Textbook Question
Chapter 7, Problem 8ST
The electromagnetic activation of a movable shaft is the basis for
- relays
- circuit breakers
- magnetic switches
- solenoids
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* Answer by true or false
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proportional to flux
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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- Explain why the lockout relay coil energizes instead of the contactor coil. See Figure 6.34.arrow_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_forwardWhich of the following statements are true? I-If an alternating current is applied to a winding, an alternating field is produced. II-If a direct current is applied to a winding, a standing (constant) field is formed. III-Rotating field can be obtained using a single winding. IV-If a rotating motor is disconnected from the mains and voltage is applied to the windings, the motor brakes.arrow_forward
- My question is the flux equation as it is does not change as the second picarrow_forwardCan you explain the given questions in an original way? Voltage (Voltage) Regulator Alternators without Excitation Machine (Constant Voltage Generators) Thyristor regulatorsarrow_forwardin a dc machine 72 number of coils are used. Find the number of commutator ?segments required 72 O 36 O 37 O 74 Oarrow_forward
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- The electromotive force created by a direct current generator is proportional to Flux/pole Speed of armature Number of poles All of the aBovearrow_forwardThe maximum amount of voltage is induced time(s) in 3600 of mechanical rotation for a single loop coil rotating between a north and south magnetic poles of a DC generator. a) one b) two c) four d) none of the abovearrow_forwardWhich of the following configurations can be used to apply Ampere's circuital law ? * A Only A Only A & B & C Only D All of them None of the above If the length of a solenoid is doubled but the number of turns is halved, the magnetic field inside will * cut by 1/2 cut by 1/4 Quadrable Double None of the above O O O Oarrow_forward
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