Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 36, Problem 9SQ
Why is it necessary to remove the jumpers in Figure 36–2 if limit switches are used?
FIG. 36–2 Typical elementary diagram of a starter with two points of acceleration for a reversing wound rotor motor.
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All answers should be written in complete sentences. Calculations should be shown in detail, and Codereferences should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC.
1. Which NEC table is used to determine the full-load current of a torque motor?
What is the simplest of all starting methods for a motor?
ANSWERE FAST PLEASE
QUESTION from book ELECTRIC MACHINE-1
LAB BASESD QUESTION
Answer precisely keeping in view the experiments performed with the equipment in the lab.
iv. What effect will the load have on a DC shunt motor with significantly high armature resistance?v. For the four-point DC starter kit, what will happen if the series resistances are connected in reverseorder. Draw and explain how this combination is better than the 3 points started.
Chapter 36 Solutions
Electric Motor Control
Ch. 36 - Are the secondary resistors connected in three...Ch. 36 - Do secondary resistors on starters with three or...Ch. 36 - Does reversing the secondary rotor leads mean that...Ch. 36 - If one of the secondary resistor contacts (S2)...Ch. 36 - In Figure 362, how many different interlocking...Ch. 36 - Referring to Figure 364, why is it not possible to...Ch. 36 - Prob. 7SQCh. 36 - If there is a locked rotor in the secondary...Ch. 36 - Why is it necessary to remove the jumpers in...Ch. 36 - Prob. 10SQ
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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
- A 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_forwardA machine delivered for installation has a 2-inch pulley on the motor and a 6-inch pulley on the load. The motor nameplate reads 180 rpm. At what speed in rpm will the driven machine rotate?arrow_forward1. Which NEC table is used to determine the full-load current of a torque motor? 2. What is the rated full-load current of a ¾-horsepower, 208-volt single-phase motor 3. What are the minimum allowable ampacities of the phase conductors and the neutral conductor that are to supply a 2-phase, 3-wire, 230-volt, 30-horsepower motor 4. . What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is operated at an 80% power factor?arrow_forward
- The NEC is very specific in its requirement that submersible electric water pump motors be grounded. Where is this specific requirement found in the Code? _______________________________________________________________________ _______________________________________________________________________arrow_forwardWorn armature bearing can result in higher than normal starter cranking current draw ? True or falsearrow_forward3 phase , delta connection , 2 pole , 1000 Volt , 50 Hz asynchronous motor 2920 RPM (friction losses will not be considered) a) calculate the iron losses of the engine ? b)calculate the output power of the engine ? c)calculate the input power ? d) effiency ? thank you :)arrow_forward
- CRPET 2amEiNee 4 - Explain, resistance ? S - Why it without load 6 - Which is be wused in answer . in details, why it is necessary to is not possible to start the d. c. 2 use starting series motor perferable ( d. c. shunt or d. c. series motor ) to places require high starting torque ? prove yourarrow_forwardHow 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 choicearrow_forwardExplain the working principle of Forward-Reverse, Start-Stop and Jog Motor control with your unique answers.arrow_forward
- List the probable causes if the armature dos notable release after the magnetic starter is de - energized .arrow_forwardYour Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations What is the rated full-load current of a ¾-horsepower, 208-volt single-phase motorarrow_forwardYour Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is operated at an 80% power factor?arrow_forward
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