Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 31, Problem 6SQ
When the high button is depressed in Figure 31–4, what prevents the high-speed starter from closing immediately?
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LAO31- Autcmatic speed control for a two-speed, two winding three-phase motor.
32. Is it necessary to press the stop button when changing from a high speed to a low speed in
figure 31-4? Why or why not?
Which is correct for Question 3?
Do fast please
Chapter 31 Solutions
Electric Motor Control
Ch. 31 - Excluding slip, at what speed (r/min) will an...Ch. 31 - What is meant by the description separate winding...Ch. 31 - Prob. 3SQCh. 31 - Prob. 4SQCh. 31 - In Figure 314, what does the broken line between...Ch. 31 - When the high button is depressed in Figure 314,...Ch. 31 - Which coils are energized immediately when the...Ch. 31 - At what speed can a four-pole, 240-volt, 5-hp,...Ch. 31 - What is meant by the compelling action produced by...Ch. 31 - Prob. 10SQ
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- 3- Why is the starting torque of the series motor high?arrow_forwardWhat removes the starting winding from the electrical circuit of an opentype split-phase motor once it reaches 75% of its operating speed? Select one: A. STARTING SWITCH B. DISCONNECT SWITCH C. CENTRIFUGAL SWITCH D. PHASE-OUT SWITCHarrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forward
- How can you determine the current that a direct current motor will draw at start-up?arrow_forwardQuestion 2: An induction motor has synchronous speed of 3600 RPM and a nameplate speed of 3520. What is the motor's percent slip • 1.8% • 2.0% • 2.2% • 2.4%arrow_forwardIn Figure 327, the motor cannot be started in high speed. Why?arrow_forward
- Q2- Indicate whether the following statements are true or false and correct the false statements 1- are placed at the magneti tral axis voted by 10au Son ffected by load current es ung MAN HUM 7- The speed of d.c series motor is decreased if the armature current is decreased 8- The compensating winding carrying the field current 9- By tapping field method, the speed of d.c series motor can be controlled below rated value 10- To solve the Commutation Problem in small machines, this can be achieved by increasing the brush widtharrow_forwardWhy there is need of starter in the 3-phase induction motor?arrow_forwardA three phase star connected six pole induction motor has parameter R1=0.294,R2=0.144,X1=0.209,X2=13.25,SLIP OF THE motor is 2% find stator of input impedencearrow_forward
- Question No.26 The full load slip of 60 Hz, 12 pole squirrel cage induction motor is 5%. Its full load speed isarrow_forwardExplain why synchronous motor doesn’t have any self-starting torque. Demonstrate some measures to make it self-starting. Please dont copyarrow_forwarda three phase star connected six pole induction motor has the following parameters R1=0.294 ohm,R2=0.144ohm,X1=0.503ohm,X2=0.209ohm Xm=13.25ohm a slip of the motor is 2%. the stator input impedence of the motor is?arrow_forward
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