Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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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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- Draw Torque-speed curve of a three phase induction motor and define Locked rotor torque,Pull- up torque and Breakdown torque.arrow_forwarda)Explain the speed control methods of direct current motor. b)Compare linear current series motor, shunt motor and component motors in terms of torque and speed.arrow_forwardAn induction motor has rotor resistance of 6 (ohm) and reactance of 8(ohm) and maximum torque at slip 0.75. Neglect stator resistances and reactance. Find value of ratio of starting torque and maximum torque.arrow_forward
- When a-c voltage is first applied to a large squirrel-cage induction motor and the rotor has not yet begun to rotate, there is A. full pull-out torque.B. maximum initial slip.C. zero locked-rotor current. D. minimum starting resistance.arrow_forwardExplain with diagrams the operation of single stack variable reluctancestepper motor. Is it possible to construct a hybrid stepper motor with 2-phase 4-pole and 100 rotor teeth?arrow_forwardA 4-pole, 50-Hz induction motor has a full-load slip of 5%. Each rotor phase has a resistance of 0.3 Ω and a standstill reactance of 1.2 Ω. Find the ratio of maximum torque to full-load torque and the speed at which maximum torque occurs.arrow_forward
- Justify with suitable diagrams why reluctance motor is termed as variabletorque motor and hysteresis motor as constant torque motor.arrow_forwardArmature resistance of a 230V shunt motor is 0.6 Ω and no load current is 2.5A. When the rotor is loaded it is taking armature current of 60A. The speed is 1200rpm.Estimate the back emf for loaded conditions.arrow_forwardA 50 Hz, 8 pole, 3 phase induction motor has full load slip of 4%. The rotor resistance is 0.001 ohm/phase and standstill reactance is 0.005 ohm/phase. Find i) the ratio of maximum torque to full load torque ii) the speed at which maximum torque occurs.arrow_forward
- what are the effects of removing the compensating winding in a universal motor and what is the importance of providing inductive compensation to a universal motorarrow_forwardThe rotor resistance and reactance per phase of a 4-pole, 50-Hz, 3-phase induction motor are 0.025 ohm and 0.12 ohm respectively. Make simplifying assumptions, state them and : (i) find speed at maximum torque (ii) find value of additional rotor resistance per phase required to give three-fourth of maximum torque at starting. Draw the equivalent circuit of a single-phase induction motor.arrow_forwardExplain with diagrams the operation of single stack variable reluctance stepper motor. Is it possible to construct a hybrid stepper motor with 2-phase 4-pole and 100 rotor teeth? Explain your answerarrow_forward
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Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
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Single Phase Induction Motor, How it works ?; Author: Lesics;https://www.youtube.com/watch?v=awrUxv7B-a8;License: Standard Youtube License