Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 3, Problem 17SQ
To determine
Choose the correct option that represents the causes of the excessive hum in an AC magnet.
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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. a) List the difference between destructive and non- destructive testing b) Give five examples of materials used for the design of any type of insulation. c)when a transformer full of magnetic material is overloaded and heats up what do you think would happen to the magnetic properties, and which law would the material be associated with in you understanding?arrow_forwardA. The brushes used in a DC generator a) ride against the commutator segments. b) are made from material softer than the commutator segments. c) are generally marked Al and A2 d) all of the above B. A magneto is a DC generator that uses for its pole pieces. a) electromagnets b) permanent magnets c) either "a" or "b" d) neither "a" nor "b"arrow_forwardCalculate the voltage of the DC source and the stored field energy of the actuator illustrated infigure 1.1. The dimensions of the magnetic circuit proposed in shown figure 1.2. The core of the magnetic circuit is made of cast steel material whose B-H characteristics is illustrated in figure 1.3. The coil in figure 1.1 has 250 turns, and the coil resistance is 5 ohms. For a given length g=5mm, a Dc source is connected to the coil to produce a flux density of 1 Tesla in the air gap.arrow_forward
- 2. Explain electrical contact resistance. Holm model of electrical contact resistance. Contact hysteresis and main related parameters.arrow_forwardThe dimensions of the circuit and the number of windings are indicated on the figure. a) Draw the equivalent circuit. b) Find the equivalent reluctance value of the magnetic circuit. c) Find the value of the total magneto-motor force produced by the coils wound on the magnetic core. d) Find the values of total magnetic flux and arm magnetic flux flowing through the magnetic circuit. e) Find the self-inductance value of each winding and the common inductance value between the windings.arrow_forward4. Explain the relationship between back emf E, terminal voltage V and coil voltage drop IR in DC motor and generator respectively. i. Describe how the field strength affect the performance of DC motor and generator. ii. Explain how an external resister changes the DC motor and generator performance.arrow_forward
- The brushes of DC machines are usually made of and are in the shape of rectangular block. Select one: O a. Carbon Graphite O b. Ceramic OC. Steel d. Phosphorarrow_forwardThe amount of torque on a current-carrying conductor in a magnetic field depends upon a. the amount of current in the conductor. b. the direction of the magnetic field between the two poles. c. the current direction in the conductor. d. the direction of rotation. e. the left-hand rule. To obtain motor action, current is supplied to a loop of wire in a magnetic field by a. slip rings. b. split rings. c. a commutator. d. brushes. e. brushes and a commutator. If another loop of wire is added to make a double-loop armature, a. the torque becomes steadier. b. the magnetic field decreases in value. c. loop current direction is affected. d. the torque becomes less smooth. e. commutator segments must be reduced in number. The principle of motor action is a. a conversion of mechanical energy to electrical energy. b. a conversion of chemical energy to electrical energy. c. a conversion of electrical energy to mechanical energy. d. an unpredictable phenomenon. e. predictable with the left-hand…arrow_forward3. i. Write the working principle of Permanent Magnet Moving Coil instrument mention the importance spring used. ii. Explain how a single PMMC instrument can be used as ammeter and voltmeter.arrow_forward
- Explain very briefly about the flux fringing and their place of occurrences.arrow_forwardResistance of armature winding. (1) Kilo Ohm Resistance of shunt field winding. Resistance of series field winding. DISCUSSION 1- From the above measurements compare between the values of armature , shunt and series windings.arrow_forwardQ choose the correct answer: 1-Brushless excitation system consisting of.... a- Stator field winding and power diodes b-stator and rotor field winding and capacitor c- stator and rotor field winding and capacitor d- Everything mentioned in the options 2- Voltage generated per phase in an alternator is proportional to a- Flux per pole b- Number of turns in armature c-Winding factors d- Everything mentioned in the options e- Frequency of waveform 3- If input mech. Power of SG constant, the functionality of AVR is a- Control flux of rotor b-Control terminal voltage c- Control flux and terminal voltage d-Control Load anglearrow_forward
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