Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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you are working as a plant electrician. you are told that a large DC motor was returned from the rewind shop and was installed on the previous shift. the motor seemed to operate properly until load was added, the motor then stopped, reversed direction, and began to run at a high speed. what is the probable cause of the trouble, and what would you do to correct the problem?
Squirrel-cage asynchronous motor, which has never been used before, as a generator in its first use will be run. Does the machine work as a generator? Explain.
1.The other possible methods of starting 3-phase induction motors. 2.How it was made sure in the control circuit that star and deltacontactors cannot operate simultaneously?3. Why we do not have the motor continue running in its star connection. 4. What is the relationship between star and delta currents?
Chapter 30 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 30 - Prob. 1RQCh. 30 - Prob. 2RQCh. 30 - Prob. 3RQCh. 30 - Prob. 4RQCh. 30 - What type of motor is known as a constant-speed...Ch. 30 - What is CEMF?Ch. 30 - Prob. 7RQCh. 30 - Prob. 8RQCh. 30 - Prob. 9RQCh. 30 - What type of motor should never be operated at no...
Ch. 30 - Prob. 11RQCh. 30 - What is the most common way of changing the...Ch. 30 - Prob. 13RQCh. 30 - Prob. 14RQCh. 30 - What device is used to disconnect power to the...Ch. 30 - Prob. 16RQCh. 30 - Who was the first person to establish a...Ch. 30 - One horsepower is equal to how many W?Ch. 30 - A motor is operating a load that requires a torque...Ch. 30 - The motor in Question 19 is connected to a 250-VDC...Ch. 30 - Prob. 1PA
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- Q1. Answer the following question briefly (not more than 4 lines) Why the rotor conductors of the squirrel cage rotor are short-circuited and in the case of slip-ring induction motors, the rotor circuit is closed through resistors? Q2. A -3-phase, 8-pole induction motor is required to be operated at about 700 rpm. If supply frequency is 60 Hz, determine its actual speed if slip is 5%. *arrow_forwardA. The DC motor in Figure 3 on Worksheet 8 is aa) cumulatively connected short-shunt compound DC motor b) cumulatively connected long-shunt compound DC motor c) differentially connected short-shunt compound DC motor d) shunt DC motorB. Is the DC motor in Figure 1 on Worksheet 8 turning in the same direction as that in Figure 3?a) yes b) noarrow_forwardwhat happened to the DC motor if it runs without any starter? Explain with diagramarrow_forward
- explain any one method of speed control of Induction motor with respect to rotor side with diagram. please i need with clear handwriting because i send the quation befor but some word not clear and i cannot be read.thanksarrow_forwardDEGREE: BS ELECTRICAL ENGINEERING COURSE: AC MACHINES Note: Please solve in this way. Given>Missing>Illustration>Solution>FinalAnswer. Please include symbols, units, formulas, step by step solution, please don't cut the solution. Thank you! (#12) A three-phase,6-pole,220-volt,60-cycle wound-rotor induction motor Is tested with the rotor circuit open. With full voltage applied to the stator, and the rotor at standstill, the voltage between slip rings is 150 volts. Determine rotor voltage and frequency at (A) Synchronous speed, and (B) 1250 RPM. [Answer: 0,0,6.25V,2.5 Hz]arrow_forwardWhen an induction motor is started directly from the line, the starting torque is 1.75 times full load torque. What will the motor starting torque in terms of full-load value, when the machine is started by the Y-A method? Answer: 1.0103 TFLarrow_forward
- the shift of the asynchronous machine gives information about the operating status of the machine. accordingly, if the slip is 0<s<1, in which operating condition does the machine work?A) as a brakeB) generator operationC) short circuitd) engine operatione) idle workingarrow_forwardDEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC MACHINES Answer the following questions (A, B and C) depending on the topic. 1. SYNCHRONOUS MOTORS A. What is necessary to start a synchronous motor to rotate from standstill? Describe the process. B. What is meant by synchronous condenser? C. Why is it possible for synchronous motors be used as a power factor correction device and what applications do synchronous motors commonly used? Describe the operation.arrow_forward4. Why Induction motors are extensively used these days:arrow_forward
- I asked the question 2 hours before but i didn't know the I had to upload by 3 -3 subparts so this is the rest of my previous question. PLEASE EXPLAIN THE d) sub part as soon as possible.Thanks in advance. The no-load and locked-rotor test results of a three-phase 10 HP, 220 V, 60 Hz, 6 poles star connected induction motor are; The no-load test: VNL=220 V, PNL=340 W, INL=6.2 A The locked-rotor test: VSC=54 V, PSC =430 W, ISC =15.2 A The voltage across the stator windings is 2 V when nominal DC current flows through it. Coefficient for DC resistance is 1,25. d) Slip value at the maximum (breakdown) torque,arrow_forwardAn 8-Pole, simplex lap wound, shunt generator has 800conductors and a flux per pole of 0.025Wb and running at 1200rpm. The armature and shunt field resistances are 0.25Ω and 120Ω respectively. If the armature voltage drop is equal to 10V, what is the load current (in Amp)? use two decimal places if the answer is not exact and do not include the unit anymore.arrow_forwarde) How is the direction of the rotating field changed in the three-phase induction motor? f) Write down the operating modes of induction motors depending on the slip values. g) When the speed of the induction motor is zero (or not rotating), in which electrical machine does it match? h) Why are the steel thin layers used in the core of the induction motor? Please answer all. Just two to three lines of answer for each question is enougharrow_forward
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Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
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ISBN:9781337900348
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