Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 3, Problem 21SQ
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Choose the best option that represents the causes for the burn out of the motor.
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20.a. A capacitive sensor is used to detect the presence of _______ objects.A. ferrousB. nonmovingC. nonconductiveD. magnetic20.b. A three-phase motor can be made to run backwards byA. connecting a resistor in series with the armature.B. reversing the control voltage connections.C. reversing three of its power leads.D. reversing two of its power leads.
The principle of operation of a DC motor is based on: (a) magnetic levitation. (b) electromagnetic induction. (c) piezoelectric effect. (d) electrostatic force. give me right answer
Please answer in typing format please
9.a. The major failure area of a typical wound-field and wound-armature DC motor isA. a faulty commutator segment.B. open field windings.C. brush wear and failure.D. bearing failure.9.b. The magnetic material that's placed inside a coil of wire in a motor is called aA. concentrator.B. pole.C. form.D. rod.
Chapter 3 Solutions
Electric Motor Control
Ch. 3 - Prob. 1SQCh. 3 - How many poles are required on motor starters for...Ch. 3 - If a motor starter is installed according to...Ch. 3 - Using the time limit overload or the dashpot...Ch. 3 - What causes the AC hum or chatter in AC...Ch. 3 - What is the phase relationship between the flux in...Ch. 3 - In what AC and DC devices is the principle of the...Ch. 3 - What does the electrician look for to remedy the...Ch. 3 - What type of protective enclosure is most commonly...Ch. 3 - What advantage is there in using combination...
Ch. 3 - What safety feature does the combination starter...Ch. 3 - Prob. 12SQCh. 3 - How is the size of the overload heaters selected...Ch. 3 - What type of motor starter enclosure (include NEMA...Ch. 3 - Prob. 15SQCh. 3 - Prob. 16SQCh. 3 - Prob. 17SQCh. 3 - Prob. 18SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 20SQCh. 3 - Prob. 21SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 23SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 28SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 30SQCh. 3 - Prob. 31SQCh. 3 - What is the difference between a grounded control...Ch. 3 - A control transformer has a primary voltage of 480...
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- (3-) Draw the electrical equivalent circuits for DC shunt motor and DC serial motor carefully and as readable with the names of circuit elements written on the figures by writing the names of figures below them.arrow_forward6.a. When you're taking a PM motor apart you should exercise special care not to damage theA. end bells.B. commutator.C. permanent magnets.D. brush holders.6.b. A PM field servo motor may be equipped with a resolver that is used toA. excite the armature windings.B. create a voltage that increases with velocity.C. prevent the brushes from sparking.D. feed back position information.arrow_forward4- A 100kW, belt driven shunt generator running at 300rpm on 220V bus bars continue to run as a motor when the belt breaks, then taking 10KW. What will be its speed? Armature resistance is 0.0250; field resistance is 602; contact drop under each brush is 1V. 5- Calculate the reactance voltage for a machine which runs at 900rpm number of commutator segments is 65, brush width is 1.74 (in commutator segments), coefficient of self induction is 153µH. Assume linear commutation and neglect mica thickness and the conductor current is 27A.arrow_forward
- F1. DC series motors have no natural speed limit and should never be operated in a no-load condition. a) true b) false F2. should never be used to connect a DC series motor to a load. a) Belts b) Chains c) either "a" or "b" d) neither "a" nor "b" F3. A gearmotor is one way of making a DC series motor so it is connected directly to a mechanical load. a) true b) falsearrow_forward1. Is it important to calculate the parameters of the induction motor? Explain why. 2. Do calculating the parameters of induction motor using measurements in the lab: - Briefly explain how to perform the experiment to obtain the necessary measurements.arrow_forwardH1. A motor _________shunt has the better speed regulation of the cumulatively connected DC compound motor.a) long b) short c) both "a" and "b" have the same speed regulation H2. You "bump" a DC motor when you are......a) trying to move it b) checking if it is mounted properly c) checking its direction of rotation d) none of the above H3. When a DC compound motor is cumulatively connected its series and shunt windings are wired te create magnetic fields which are______ polarity. a) opposite b) the same c) either "a" or "b" d) neither "a" nor "b"arrow_forward
- Laboratory Manual – Electrical Machines 1 (EE 3101B) Cris Angelo E. Diazon 8. In what two ways can the speed of a dc motor be varied? a) b) 9. Of the two methods given in (8): a) Which method gives the greatest speed range? b) Which method is the most economical (uses fewer parts)? VI. OBSERVATIONS/DISCUSSIONarrow_forwardYour Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations. 7.What is the full-load current of a 600-volt, 3-phase, 50-horsepower induction motor?arrow_forwardThis question about control system I need the answer about half an hourarrow_forward
- L1. It common practice to provide access to the interpole windings on machines designed to be used as motors or generators. a) is b) is not c) neither "a" nor "b" L2. The direction of rotation of a DC motor is referenced from the commutator end of the motor. a) true b) false L3. How may the direction of rotation of a DC motor be reversed? a) by reversing the direction of current flow in the armature conductors b) by reversing the polarity of the magnetic field poles c) either "a" or "b" d) neither "a" nor "b"arrow_forwardQ51 Which NEC table is used to determine the full-load current of a torque motor? Select one: A. NEC TABLE 430.6(B) B. NEC TABLE 430.7(B) C. NEC TABLE 430.24 D. NEC TABLE 430.22arrow_forwardQ2 ) I. What is the effect of chang ing the sequence of phases in the electric feeder (single phase, three-phase) motor? How do you correct the defect if necessary?arrow_forward
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