l3answer 1 2 and 3 Lesson 3- Circuits 11. A group of dc motors is to operate at 220 volts at a placethat is 400 it away from 230-volt mains. What diameter(minimum) of copper wire is to be used in connecting themotors to the main, if the motors take a total of 75 A?a. 0.25 inb. 0.33 inc. 0.18 ind. 0.45 in2. An 8-Qresistance and resistor R. The entire circuit isconnected across a 100-V source. If the voltage acrossresistor R is 20 V, find the value of R.a. 40b. 6Nc. 20d. 803. Two resistors are wound with round copper wire. The lengthand cross sectional area of the second wire is 25% and 50%of the first wire. Determine the ratio of the power drawnby the first to the second resistors if they are connectedacross the same voltage source.a. 1/8b. 1/4c. 1/2d. 1/16

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Answered: 1. A group of dc motors is to operate…

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter44: Use Of Reduced Voltage For Starting

Section: Chapter Questions

Problem 4SQ

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All answers should be written in complete sentences. Calculations should be shown in detail, and Codereferences should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC. 1. Which NEC table is used to determine the full-load current of a torque motor?
1. Which NEC table is used to determine the full-load current of a torque motor? 2. What is the rated full-load current of a ¾-horsepower, 208-volt single-phase motor 3. What are the minimum allowable ampacities of the phase conductors and the neutral conductor that are to supply a 2-phase, 3-wire, 230-volt, 30-horsepower motor 4. . What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is operated at an 80% power factor?
Your Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations What is the rated full-load current of a ¾-horsepower, 208-volt single-phase motor
Your Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations What size conductor would be required to supply three motors connected to a 440-volt, 3-phase branch circuit? Motor #1 is a 50-horsepower, code B induction motor; motor #2 is a 40-horsepower, code H induction motor; and motor #3 is a 50-horsepower, code J induction motor
Your Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is operated at an 80% power factor?
A 460VAC rated, 60 Hz, 125-Hp Three-phase induction type motor is to be connected for across-the-line starting. The nameplate indicates the motor’s maximum ampere rating, 160A. It has a NEMA code letter B. The ambient temp of the installation place is and TW copper will be used. Short-circuit protection device that will be used is Inverse Time Breaker. Calculate the Thermal Overload Protection.
Identify the DC Motor used in Conveyor belt system. With a neat sketch explain its working. List it's advantages and disadvantages. - Reference must be added in slide. - Materials to be prepared apart from handout.
A 200V long-shunt generator delivers 100A, has an armature resistance of 0.05Ω, a series field resistance of 0.25Ω and a shunt field resistance of 200Ω. If a feeder resistance of 0.05Ω and a brush contact drop of 2.5V are considered, what will be the generated voltage (in Volts) of the machine? use two decimal places if the answer is not exact and do not include the unit anymore.
A 460VAC rated, 60 Hz, 125-Hp Three-phase induction type motor is to be connected for across-the-line starting. The nameplate indicates the motor’s maximum ampere rating, 160A. It has a NEMA code letter B. The ambient temp of the installation place is and TW copper will be used. Short-circuit protection device that will be used is Inverse Time Breaker. Calculate the Motor Starter Size.
A 460VAC rated, 60 Hz, 125-Hp Three-phase induction type motor is to be connected for across-the-line starting. The nameplate indicates the motor’s maximum ampere rating, 160A. It has a NEMA code letter B. The ambient temp of the installation place is and TW copper will be used. Short-circuit protection device that will be used is Inverse Time Breaker. Calculate the Conductor size.
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1. A group of dc motors is to operate at 220 volts at a place that is 400 ft away from 230-volt mains. What diameter (minimum) of copper wire is to be used in connecting the motors to the main, if the motors take a total of 75 A? a. 0.25 in b. 0.33 in c. 0.18 in