Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 33, Problem 16RQ
When a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?
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If static voltage of a squirrel cage induction motor is reduced to 50 percent of it's rated value, torque developed is reduced by how many percentage of its full load value ?
Chapter 33 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 33 - What are the three basic types of split-phase...Ch. 33 - The voltages of a two-phase system are how many...Ch. 33 - How are the start and run windings of a...Ch. 33 - In order to produce maximum starting torque in a...Ch. 33 - What is the advantage of the capacitor-start...Ch. 33 - On average, how many degrees out of phase with...Ch. 33 - What device is used to disconnect the start...Ch. 33 - Why does a split-phase motor continue to operate...Ch. 33 - How can the direction of rotation of a split-phase...Ch. 33 - If a dual-voltage split-phase motor is to be...
Ch. 33 - When determining the direction of rotation for a...Ch. 33 - What type of split-phase motor does not generally...Ch. 33 - What type of single-phase motor develops the...Ch. 33 - Prob. 14RQCh. 33 - Prob. 15RQCh. 33 - When a repulsion-start induction-run motor reaches...Ch. 33 - Prob. 17RQCh. 33 - What causes the magnetic field to rotate in a...Ch. 33 - How can the direction of rotation of a shaded-pole...Ch. 33 - Prob. 20RQCh. 33 - Prob. 21RQCh. 33 - Prob. 22RQCh. 33 - Prob. 23RQCh. 33 - Prob. 24RQCh. 33 - What is the principle of operation of a stepping...Ch. 33 - What does the term bifilar mean?Ch. 33 - Prob. 27RQCh. 33 - When a stepping motor is connected to AC power,...Ch. 33 - What is the synchronous speed of an eight-pole...Ch. 33 - How can the holding torque of a stepping motor be...Ch. 33 - Why is the AC series motor often referred to as a...Ch. 33 - Prob. 32RQCh. 33 - How is the direction of rotation of the universal...Ch. 33 - Prob. 34RQCh. 33 - Prob. 35RQCh. 33 - Prob. 36RQCh. 33 - Prob. 1PA
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- 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_forwardWhy there is need of starter in the 3-phase induction motor?arrow_forwardName three characteristics that make the synchronous motor different from an induction motor?arrow_forward
- On average, how many degrees out of phase with each other are the start- and run-winding currents in a resistance-start induction-run motor?arrow_forwardHow can the induction motor be determined with the condition that the asynchronous motor driver keeps the slip value constant Explain that you can adjust to different values.arrow_forwardA 4-pole, 60 Hz, 3-phase induction motor has a blocked rotor reactance of0.4 ohm per phase and the rotor resistance is 0.1 ohm per phase. At whatspeed will the motor develop maximum torque?arrow_forward
- Q.23 When a repulsion-start induction-run motor reaches about 75% of rated full load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor? Select one: A. SHORT CIRCUIT THE COMMUTATOR B. A CAPACITOR MUST LEAD THE VOLTAGE C. THE INDUCTOR MUST LAG THE VOLTAGE D. PREVENT THE SQUIRREL-CAGE FROM SHORTING OUTarrow_forwardHow do you make a synchronous motor self starting?arrow_forwardA 25 hp,250V long shunt compound motor takes 5 A when running light and runs at 1150 rpm. Armature resistance, 0.15 ohm, Shunt field resistance, 200 ohm and series field resistance, 0.05 ohm. At rated load the motor takes 86.5A and runs at 720 rpm. Determine the ratio of torque developed from no-load to full load.arrow_forward
- A 3-f, 4-pole, 50Hz induction motor has no-load slip of 1% and full load slip of 2.5%. Calculate the no-load and full load RPM ofthe motor as well as the frequency of the rotor currents at standstill and full load.arrow_forwardBriefly explain why a synchronous motor requires starting mechanism. Is there anystarting problem associated with the induction motor? How do you overcome it?arrow_forwardNEED IN 5 MINS URGENT PLEASEEE :(( At what speed will a 12-pole, 50-cycle induction motor operate if the slip is 0.1?arrow_forward
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