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 14ST
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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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- 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 reluctance of a non-magnetic circuit is 14 units. How much flux will be set up if surrounded by a coil 620 turns carrying a current of 3.6 Ampere? Draw the diagramarrow_forwardCalculate the flux (mWb) in a rectangular core that is 8.0 mm by 7 mm if the flux density is 4.0 Tesla?arrow_forward
- A dc machine has hysteresis loss of 300 W and an eddy current loss of 200 W when running at 1200 rpm. At what speed will the total core losses be a quarter of the original if the flux is to be twice as the original.arrow_forwardCalculate the MMF when the magnetic flux is 5Wb and the reluctance is 3A/Wb. a. 15AT O b. 10N C. 10AT O d. 15Narrow_forwardA coil of 1000 turns is wound on a core. A current of 1A flowing through the coil creates a core flux of 1mwb. What is the energy stored in the magnetic field.arrow_forward
- A DC generator has eight poles, wound as lap then rewound as a wave, calculate the electrical motive force generated in each case if you know that the number of conductors in the armature slots is 240 . The magnetic flux of each pole 0.04 Wb. It runs at 1200 rpmarrow_forwardThe length of a magnetic circuit in a moving iron instrument is 300mm. The coil around the soft iron core has 360 turns and takes a current of 1.75 A. The core is square in section with sides of 20mm. Take the relative permeability of soft iron as 1100. Determine the total fluxarrow_forwardQuestion 9 An air gap is usually inserted in magnetic circuits to Increase the flux None of these Prevent saturation Increase m.m.f.arrow_forward
- The speed of a dc motor is directly proportional to the flux O inversely proportional to applied voltage O inversely proportional to back emf inversely proportional to the fluxarrow_forwardA magnetic coil produces 100,000 maxwell with 2000 turns and with a current of a 2A. The current is cut-off and the flux collapse in 0.01 sec. What is the average voltage that will appear across the coil?arrow_forwardA four pole machines generates 250V when operated at 1500 rpm. If the flux per pole is 1.85 x 106 maxwell, the number of armature slots is 45 and the armature winding has two parallel paths. If the speed of the generator is reduced to 1350 rpm, what would be the generated voltage. To what value of flux per pole should the excitation be adjusted if the generated voltage is to remain the same at 250Varrow_forward
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