Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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1. What is the relationship between voltage and current when there is saturation in the magnetic circuit?
2. When there is no saturation in the magnetic circuit, what is the relationship between voltage and current?
3. Briefly explain what caused the saturation in the magnetic circuit.
4. What happens to alternating current, alternating current, and alternating magnetic flux in a magnetic circuit when frequency increases?
5. When a magnetic circuit is saturated, explain two solutions that can be used so that the magnetic circuit is no longer saturated.
Chapter 32 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 32 - What are the three basic types of three-phase...Ch. 32 - What is the principle of operation of all...Ch. 32 - What is synchronous speed?Ch. 32 - What two factors determine synchronous speed?Ch. 32 - Prob. 5RQCh. 32 - Name three factors that determine the torque...Ch. 32 - Is the synchronous motor an induction motor?Ch. 32 - Prob. 8RQCh. 32 - Why must a synchronous motor never be started when...Ch. 32 - Name three characteristics that make the...
Ch. 32 - What is the function of the field-discharge...Ch. 32 - Why can an induction motor never operate at...Ch. 32 - A squirrel-cage induction motor is operating at...Ch. 32 - Prob. 14RQCh. 32 - Prob. 15RQCh. 32 - Prob. 16RQCh. 32 - Name three factors that determine the amount of...Ch. 32 - Why will the rotor of a wound-rotor motor not turn...Ch. 32 - Why is the starting torque per A of starting...Ch. 32 - When is a synchronous motor a synchronous...Ch. 32 - What determines when a synchronous motor is at...Ch. 32 - How can a synchronous motor be made to have a...Ch. 32 - Is the excitation current of a synchronous motor...Ch. 32 - Prob. 24RQCh. 32 - Prob. 25RQCh. 32 - You are working as a plant electrician. It is your...Ch. 32 - You have been given the task of connecting a...Ch. 32 - You are an electrician working in an industrial...
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- 28 The electromagnet of Figure P13.28 has reluctance given by R(x) = 7 × 108(0.002 + x) H¬!, where x is the length of the variable gap in meters. The coil has 980 turns and 30-2 resistance. For an applied voltage of 120 V DC, findarrow_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_forwardFor the electromagnet of Figure-a. Find the flux density in the core.b. Sketch the magnetic flux lines and indicate theirdirection.c. Indicate the north and south poles of the magnet.arrow_forward
- A magnet has a north and a south pole which are linked through a magnetic field force. Draw a diagram to illustrate the fields when: i) A single magnet is involved ii) When two magnets are next to each other with the opposite poles alignedarrow_forwardA 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 length of stiff copper wire is made into a rectangle measuring 24 cm by 10 cm. It is rotated at a uniform speed of 600 rpm about one of its longer sides as axis, this side lying on and at right angle to a uniform magnetic field of 0.5T calculate the induced voltage in the coil. * Draw the diagramarrow_forward
- What is MMF? O Magnetic Machine Force Magnetomotive Force Magnetic Motion Force Magnetomotion Forcearrow_forwardThe flux per pole of a two-pole generator is 7.5x10^-5 wb. A coil of 600 turns rotates in this magnetic field. It takes 0.0187 sec. for the coil to rotate from a point of maximum flux to one of minimum flux. Find the induced voltage.arrow_forwardIn the figure, the current through the wire (shown in cross-section) is into the screen. What will be the direction of the magnetic field produced by the wire? Figure for Problem 1 x current a. Clockwise O b. Counterclockwise C. To the left d. To the right e. Information is insufficient.arrow_forward
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