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 9TFQ
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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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- divided by rpm. Torque equals horsepower 5252 a. b. horsepower x 5252 voltage x horsepower C. d.arrow_forwardA series motor develops 164 lb-ft torque when the current is 94A. If the load increases the current 50% with the flux increase of 20%, what is the torque at the second value of current?arrow_forward1. Knowing that a motor has a power P of 300 W, calculate the torque T that the motor must produce in order to rotate at a speed n of 1146 r/min. T= 1.79 N·m O T= 2.50 N•m O T= 5.33 N•m O T= 4.14 N-marrow_forward
- The voltage induced in a generator is 110 V when the armature rotates at 1100 r/min. What will the voltage be if the speed is increased to 1200 r/min? A generator operating at 1850 r/min develops a voltage of 130 V. What must be the speed of the generator for a voltage of 120 V?arrow_forwardIron losses in a DC machine are independent of variations in ) load voltage speed O All of thesearrow_forwardFind the mechanical speeds in revolutions per minute of a multipole electrical machine, if the frequency of the generated voltage is 50 Hz for a two-pole machine a four -pole machine an eight-pole machinearrow_forward
- A DC motor armature draws 150 A while generating a magnetic flux of 0.02 Wb. The armature constant is K = 1 V min/Wb. What is most nearly the motor's developed torque? 28.65 n-m 50.3 n-m O 4,73 n-m O 11.70 n-marrow_forward13. A permanent magnet motor has the ability to generate to a variety of magnetic fields True O Falsearrow_forwardIn a motor, increasing the gap between electromagnets and a rotor: Select one: decreases motor torque. increases motor torque. increases motor speed. reverses the direction the rotor turns.arrow_forward
- A compound motor short draw a current of 50 A at a voltage of 220 V it rotates at a speed of 1200 rpm Calculate the reverse electromotive force if the resistance of the product is 0.04 ohm the resistance of the series windings is 0.01 ohm and the resistance of the parallel windings is 125 ohm then Calculate the torque generatedarrow_forwardIn DC motor, if speed decreases then the Supply voltgae increases O Flux increases Flux decreases O Line current increasearrow_forwardA separately-excited dc generator develops running at 1189 rpm at a certain flux generate a certain voltage. What should be the new speed in rpm if the voltage is intended to increase by 32 % and the flux is reduced to 73 % from the original value?arrow_forward
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