Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Question
Chapter 48, Problem 11SQ
To determine
Explain when the power supply is lost for 10 minutes, what happens to the motor while running in the forward direction in Figure 48-8.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Explain how does the current will be reduced during the starting of the motor.
Why would the slip not change? If you start the motor at 80% of the rated frequency, wouldn't that be 48 Hz?
Why are stranded copper wire is used instead of solid copper wirename the four types of battery capacity rating
What type of engine conversion occurs when the battery is discharging?
List the seven components of the starting system
List the four most common start a customer complaints
What is the name of the stationary coil that produces current in the AC generator?
what is the name of the company that creates the rotating mechanical field of the AC generator?
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
- Select the best answer for each of the following. The purpose of overload protection on a motor is to protect the a. motor from sustained overcurrents. b. wire from high currents. c. motor from sustained overvoltage. d. motor from short circuits.arrow_forwardWhat happens to a motor if it is connected in Delta connection ?arrow_forwardis the DC motor in figure 1 turning in the same direction as that in figure 3 ? a- yes b- noarrow_forward
- 10 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_forwardHow would the shaft speed of the motor change if a negative torque is applied while motor is spinning in negative direction? Don't copy pastearrow_forwardSix generators are operating in parallel supply a total current of 3500 A. Each machine has a field resistance of 60 ohms and an armature resistance of 0.01 ohm. The emfs generated of these generators are 250, 270 ,280, 290, 300, 310 volts respectively. Find the share of each of the generator.arrow_forward
- Why we do not have the motor continue running in its star connection.arrow_forwardThe deep well pump motor is 50 hp, 3-phase, 4-poles, 230 volts, 60 Hz induction motor, operating at 0.90 efficiency, 0.85 power factor and 3 % slip. Determine the current at which the motor is operating. (a). 112.7 A (b). 122.4 A (c). 120. 5 A (d). 124.7 Aarrow_forwardTwo shunt generators and a battery are all connected to common bus-bars. The open circuit voltage of the battery is 247 V. The open circuit voltage, armature and field resistances of the generators are 250 v, 0.12 ohms and 100 ohms respectively. Both the generators supply the same current when the load on the bus-bars is 40 A. Calculate the internal resistance of the batteryarrow_forward
- If the applied voltage drops to half value while the asynchronous motor is running at full load, which of the following situations will occur? A) MOTOR CURRENT DOES NOT CHANGE B) THE ENGINE CONTINUES TO WORK AT THE SAME SPEED BECAUSE THE FREQUENCY DOES NOT CHANGE C) ENGINE MAY REACH AND STOP D) ENGINE SPEEDarrow_forwardA dc generator is capable of producing 120 volts on open circuit. A load of 30 Amperes is connected, and the voltage at the terminals of the generator drops to 100 volts. What is the efficiency of the machine?arrow_forwardA motor had a full load current rating of 74.8 and the terminations are rated for 75c . What is the minimum conductor size and type?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
Single Phase Induction Motor, How it works ?; Author: Lesics;https://www.youtube.com/watch?v=awrUxv7B-a8;License: Standard Youtube License