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 10TFQ
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A 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 is
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A permanent magnet dc motor has a rotor radius of 1.3 cm, magnetic thickness of 0.25cm, and a gap length of 0.05 cm. The magnetic flux density in the motor 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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- The shunt DC generator gives almost O Constant current O None of these O Constant voltage O Constant current and voltagearrow_forwardRotor is held to step position in a stepper motor due to Rotor flux alone Stator and rotor flux locking O Neither stator nor rotor magnetic flux O Stator flux alonearrow_forwardMaximum torque is realized when an armature winding is with the magnetic field O at 90° O inline or at 0° at 45° O turningarrow_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 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_forwardCan you explain the given questions in an original way? Factors Affecting Electrical Energy in DC Generators shunt generators Serial Generatorsarrow_forward
- Question 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_forwardThe electromotive force created by a direct current generator is proportional to Flux/pole Speed of armature Number of poles All of the aBovearrow_forwardIn DC generators brushes are used for O Collecting Current O Collecting eddy current loss O reduce eddy current loss O convert ac armaturê current in to dcarrow_forward
- Differentiate between the AC and DC magnetic fields applied to an induction motor stator.arrow_forwardIron losses in a DC machine are independent of variations in ) load voltage speed O All of thesearrow_forwardDue to the presence of two rotating magnetic fields force the three phase induction motor is self starting Select one: O True O Falsearrow_forward
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