Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 48, Problem 9SQ
To determine
State what action should to be taken by the operator for the given situation.
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
The starting current of a 15-hp, 440 volt, and three-phase induction motor is 32 amperes when rated voltage is applied. What voltage should be applied at the starting instant if the starting current is not to exceed 60 amperes?
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?
How to avoid the effect of the high current at starting of the Motor?
a.
variable resistor is connected in series with Armature circuit
b.
variable resistor is connected in parallel with Armature circuit
c.
variable resistor is connected in series with field circuit
d.
None of the above
Clear my choice
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- In Figure 327, the motor cannot be started in high speed. Why?arrow_forwardA squirrel-cage induction motor has a nameplate full-load current of 78 amperes and a marked temperature rise of 30C. The motor requires a NEMA size 4 starter. Using the overload heater chart in Figure 34-8, what size overload heaters should be used to protect this motor?arrow_forwardMotors will operate satisfactorily at what percent over and under voltage?arrow_forward
- What type of motor should never be operated at no load?arrow_forwardThe label speed of the three-phase, 50 Hz ringed asynchronous motor is 896 rpm and the stator groove number is 36. The stator given in the question without beaming, with the number of coil windings being 10 Draw the windings as chain wrap.arrow_forward10 kW, 400 volt 3 phase star connected synchronous motor has negligible armature resistance the synchronous reactance per phages 10 ohms. Determine induced emf if the motor draws minimum current with excitation variable. The full load efficiency of motor is 80%. 10 minute fast please answerarrow_forward
- Why are different motor connections shown for what appears to be the same motor in the various diagrams in Figure 332? FIG. 332 Typical arrangements for four-speed, three-phase, two-winding motors.arrow_forward10 kW, 400 volt 3 phase star connected synchronous motor has negligible armature resistance the synchronous reactance per phages 10 ohms. Determine the minimum current that the motor will draw if the excitation is varied. The full load efficiency of motor is 80% 10 minute fast please answerarrow_forwardAn asynchronous motor is operating under a mechanical load. The mechanical load isgradually decreased. The load is always less than the nameplate rating of the motor. Themotor speed will ?And draw less or more power?arrow_forward
- Determine the value of starting resistance of the 7.5 kW, 220 V shunt motor so thatthe current will not exceed 2 times of the motors full load rating. The armature andfield resistance is 0.24 and 101 ohms respectively. The motor efficiency is 95%arrow_forwardINCounter-Current Breaking of a 3-Phase Induction Motor (Reversing the Operation of a 3-Phase Induction Motor). Could you suggest any improvements to the control circuit?arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning