Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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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.
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Explain how does the current will be reduced during the starting of the motor.
Q2: b- Explain how does the three- phase induction motor work? *
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 SPEED
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...
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- Why would the slip not change? If you start the motor at 80% of the rated frequency, wouldn't that be 48 Hz?arrow_forwardwhat happened to the DC motor if it runs without any starter? Explain with diagramarrow_forwardList the four basic faults which can prevent a self excited generator to buildup voltage.arrow_forward
- 23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open a. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because the rotating magnetic field does not have enough poles b. the rotating magnetic field is produced by only 50 HZ frequency currents the force required to accelerate the rotor is to the synchronous speed in an instant is d. the starting devices to accelerate the rotor to near synchronous speed is absent 25. Synchronous motor has speed a. slight drop in speed on full load b.high speed at low torque а. с. c. constant speed d. low speed at high -arrow_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_forwardSelect 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_forward
- 4-What is the main function of a diverter used in series wound DC motor? 5- What is the main difference between (iron and friction losses) and copper (Cu) losses in DC generators? 05arrow_forwardDefine or state the principle of operation, draw the wiring diagram, discuss the construction and application of each motor Split phase capacitor motor Repulsion motorarrow_forward14/ What are the following statements are true for a three-phase induction motor? I. Three-phase induction motor stator winding is fed from a three-phase supply II. Stator carries a three-phase winding III. Rotor carries a short circuited winding a. I and II only b. I,II and III c. II and III d. I onlyarrow_forward
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