Which of the following statements are true? I-If an alternating current is applied to a winding, an alternating field is produced. II-If a direct current is applied to a winding, a standing (constant) field is formed. III-Rotating field can be obtained using a single winding.

Which of the following statements are true? I-If an alternating current is applied to a winding, an alternating field is produced. II-If a direct current is applied to a winding, a standing (constant) field is formed. III-Rotating field can be obtained using a single winding.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter3: Magnetic Starters

Section: Chapter Questions

Problem 18SQ

See similar textbooks

Related questions

Q: Two identical coils A and B having 1000 turns and wound on a common magnetic core. 60 % of the flux…

Q: A magnetic circuit with three airgap is given in the following figure. Assume that the core has…

A: Note-“Since you have posted a question with multiple sub-parts, we will solve first three subparts…

Q: Activity no. 9. Electromagnetism 1. A coil has 480 turns and flux in it changes from 0.24 m wb to…

A: 1- The given parameters of the coil are as follows: Number of turns, N=480 Initial flux, ϕi=0.24…

Q: T or F, modify the wrong part if False, please underline twice your answer if True or False.…

A: In this question we will write relation between field flux and current in dc series motor....

Q: A 4-pole dc generator with duplex lap winding has 48 slots and 4 elements per slot. The flux per…

Q: A DC generator has 4 pole, wave wound amature with 736 conductors. If the induced voltage in the…

A: According to the question we have to find the value of flux per pole.

Q: 6.9 justify the following statement: if the interpole winding is left unexcited, commutation will be…

A: Ans. True

Q: 1. Current flowing through the field coils : a. Magnetizes the pole pieces. b. Makes the generator…

A: MCQs type questions are given. Note: As per Bartleby Portal, I am solving first three MCQs.

Q: A coil of 800 turns is wound on a wooden former and a current of 5A produces a magnetic flux of…

A: In this question we will find inductance and induced emf.......

Q: Two identical coils A and B having 1000 turns and wound on a common magnetic core. 60% of the flux…

A: Given:Number of turns in coil A=1000Number of turns in coil B=100060% of the flux is linked…

Q: Electrical Engineering DRAW THE FOLLOWING DIAGRAMS OF INDUCTION MOTOR AND LABEL THEM ( MAKE SURE…

A: Electrical Engineering DRAW THE FOLLOWING DIAGRAMS OF INDUCTION MOTOR AND LABEL THEM 1) 3-phase…

Q: Fill in the blanks 1. The self-excited dc shunt generator provides its own ____________. 2. In a…

A: According to guidelines we need to solve only the first question. According to the question we have…

Q: A three-phase Y-connected four-pole winding is installed in 24 slots on a stator. There are 40 turns…

Q: The following questions refer to to a 6-pole DC generator has a simplex lap-wound armature…

Q: to complete this assessment. Question 8 If residual magnetism is present in a D.C. generator, the…

A: The solution is given below

Q: 6. A 4-pole lap winding motor with 16 slots, 42 conductors per slot, 480 V runs at 1,800 rpm. Find…

Q: The function of Copper shading band in induction type energy meter is to ensure flux produced by…

A: The function of copper shading band is to bring the flux exactly in quadrature with supply voltage.

Q: (7) The only parts suffers from eddy currents in AC motors: a- The stator. b- The rotor. c- The…

A: 7. Answer: The stator and rotor Explanation: The rotating magnetic field and induced voltage cause…

Q: Identify the machine where the Rotating magnetic field is produced. a. Three Phase Induction Motor…

A: We need to Identify the machine where the Rotating magnetic field is produced. a. Three Phase…

Q: The flux through each turn of a 100-turn coil is (t^3 - 2t) mWb, where t is in seconds. The induced…

Q: A three phase, 50 Hz, 8 pole alternator has a star connected winding with 120 slots and 6 conductor…

A: It is given that: f=50Hzp=8slots=120conductor per slot=6ϕpp=0.05for full pitched coil:kp=1

Q: A 3-phase, Y-connected, AC generator has a stator with 120 slots, each slot contains 15 conductors.…

A: Principle of Machine: In any electrical machine either it's a DC machine or AC machine, the EMF in…

Q: The field windings of a series motor has a resistance of 120 ohms at 15 deg. C. After running for…

A: The solution can be achieved as follows.

Q: 3. How does a split ring commutator work? * Coil rotation Coil Commutator a) Swaps the contact every…

A: Now we have been seen that in the armature, we are getting a AC voltage in DC generator the o/p…

Q: What part of a motor produces an inductive magnetic field within itself to facilitate the rotating…

A: The squirrel cage of a motor produces an inductive magnetic field when the supply given to the…

Q: A short composite motor draw or pulls stream a current of 50 A at a voltage of 220 V it rotates at…

A: A short composite motor is nothing but a short shunt compound motor. The given parameters for a…

Q: Calculate the phase and line voltages of three phase star-connected 4 pole small alternator having a…

A: Given data, The total flux is 0.30 Wb. The relative speed is 1500 rpm The number of pole is 4. The…

Q: This type of winding develops low voltage and high current. wave winding lap winding frog-leg…

A: As per company policy we are supposed to answer 3 subpart in case of multiple subpart. 1) In case…

Q: The field windings of a series motor has a resistance of 180 ohms at 30 degree Celsius. After…

A: Given,R1=180Ω t1=30°CR2=140Ω t2=?α=0.004We have the…

Q: A 3-phase, 60 Hz, Y-connected, AC generator has a stator with 72 slots, each slot contains 10…

A: In this question , we wil find induced line and phase emf for star connected alternator....

Q: 1. Lap winding is suitable for Voltage, current d.c. generators. ....... ......

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: Calculate the coil pitches and indicate the slots into which the first coil should be placed for the…

A: Coil pitch is the angular distance between two sides of a coil in terms of armature slot. a. Slot =…

Q: A three-phase four-pole winding is installed in 12 slots on a stator. There are 40 turns of wire in…

A: Principle of Machine: In any electrical machine, either it's a DC machine or AC machine, the EMF in…

Q: The DC shunt generator with the terminal voltage 300 V, armature drop 9 V and the total brush drop 4…

A: Given: DC Shunt generator, Terminal voltage, Vt = 300V Armature drop, Ia.Ra = 9 V Total brush drop,…

Q: An DC series generator is otherwise called it as variable flux machine. Select one: True False

Q: A6 pole DC lap wound generator has 28 armature conductors with flux per pole is 27 mwb and the emf…

Q: A coil is placed along y-axis and moving with a velocity of 2i+6j-7k m/s. It is 1200mm long and…

A: The solution is given below

Q: Which of the following statement is CORRECT one? (a) The value of inductance is high for long, thin…

A: OPTION C i.e The value of inductance is more if the number of coil turns is less is the correct…

Q: The DC voltage is generated in the Field winding of DC Generator. Select one: True False

Q: b) Prove that the equation for the induce voltage of a single simple rotating loop e ind Is just a…

Q: The generated voltage in rotor windings depends on Select one: a. Construction features b. Number of…

A: According to the question we have to discuss, the generated voltage in the rotor winding depends on…

Q: justify the following statement: if the interpole winding is left unexcited, commutation will be…

A: Ans . NO

Q: 6. Hysteresis loss depends upon_ a. the volume and grade of iron c. frequency of magnetic reversals…

Q: (B)-ndicate whether the following statements are true or false and correct the faise statements.…

Q: Which of the following represents the rotating losses of machine Friction and windage losses Eddy…

A: Due to the rotation of machine flux leakage occurs this cause to various losses 1. Friction and…

Q: A generating voltmeter must be designed so that it can have a range from 20 to 200 kV dc. Determine…

A: Given V=20 to 200 kV I= 2 υA -25 υA synchronous speed =1500-3000 rpm Assumption We assume…

Q: 1. In Lap winding, the number of brushes is always: a. Double the number of poles b. Same as number…

Q: A 6-pole DC generator with 157 slots and with 2 coil per slot, simplex wave, find the parallel path

A: Parallel paths, A = 2

Q: QI\ A/ choose the correct answer of the following questions: 1. In Lap winding, the number of…

Concept explainers

Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.

Question

Which of the following statements are true?

I-If an alternating current is applied to a winding, an alternating field is produced.

II-If a direct current is applied to a winding, a standing (constant) field is formed.

III-Rotating field can be obtained using a single winding.

IV-If a rotating motor is disconnected from the mains and voltage is applied to the windings, the motor brakes.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

Step 2

Step 3

Step 4

Step by step

Solved in 4 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

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

The strength of the rotating magnetic field in a three phase induction motor is equal to times the flux produce ...... ....... in one of the phase windings. 1.25 1 O 1.5
A three-phase four-pole winding is installed in 12 slots on a stator. There are 40 turns of wire in each slot of the windings. All coils in each phase are connected in series, and the three phases are connected in A. The flux per pole in the machine is 0.060 Wb, and the speed of rotation of the magnetic field is 1800 r/min. (a) What is the frequency of the voltage produced in this winding? (b) What are the resulting phase and terminal voltages of this stator? SOLUTION (a) The frequency of the voltage produced in this winding is (1800 r/min)(4 poles) n„P f, = 120 = 60 Hz 120 (b) There are 12 slots on this stator, with 40 turns of wire per slot. Since this is a four-pole machine, there are two sets of coils (4 slots) associated with each phase. The voltage in the coils in one pair of slots is E, = 2nN of = /27(40 t)(0.060 Wb)(60 Hz) = 640 V %3D There are two sets of coils per phase, since this is a four-pole machine, and they are connected in series, so the total phase voltage is V, =…
A) Although the magnetic field for each phase of a 3-phase induction motor is merely switching back and forth between north and south poles, the resultant magnetic influence from all phases sets up a rotating magnetic field to cut the rotor conductors. a) true b) false B) In a two-pole stator winding of a 3-phase motor, how many revolutions does the rotating magnetic field make in one cycle of the electrical current? a) one b) 60 c) 3600 d) none of the above 3.
A four-pole, wave-wound generator has 220 coils of 10 turns each. The resistance of each turn is 0.02 2. Find the resistance of the armature winding.
3-4. A three-phase, Y-connected, four-pole winding is installed in 24 slots on a stator. There are 40 turns of wire in each slot of the windings. All coils in cach phase are connected in series. The flux per pole in the machine is 0.060 Wb, and the speed of rotation of the magnetic field is 1800 r/min. (a) What is the frequency of the voltage produced in this winding? (b) What are the resulting phase and terminal voltages of this stator? 3-5. A three-phase, A-connected, six-pole winding is installed in 36 slots on a stator. There are 150 turns of wire in each slot of the windings. All coils in each phase are connected in series. The flux per pole in the machine is 0.060 Wb, and the speed of rolation of the magnetic fieid is 1000 r/min. (a) What is the frequency of the voltage produced in this winding? (b) What are the resulting phase and terminal voltages of this sStator?
A three-phase Y-connected four-pole winding is installed in 24 slots on a stator. There are 40 turns of wire in each slot of the windings. All coils in each phase are connected in series. The flux per pole in the machine is 0.060 Wb, and the speed of rotation of the magnetic field is 1800 r/min. (a) What is the frequency of the voltage produced in this winding? (b) What are the resulting phase and terminal voltages of this stator
3. A group of electromagnets that create flux in a d-c generator (the field circuit) has an inductance of 18 henrys. If the 3.4 amp excitation is interrupted in 0.08 sec by the opening of the field switch, what average voltage is induced in the winding?
The DC shunt generator with the terminal voltage 375 V, armature drop 7 V and the each brush drop 2 V, then the value of generated emf is
4. A 4-pole, lap-wound armature has 144 slots with two coil sides per slot, each coil having two turns. If the flux per pole is 20 mWb and the armature rotates at 700 rpm, what is the induced voltage?
3-5. A three-phase, A-connected, six-pole winding is installed in 36 slots on a stator. There are 150 turns of wire in each slot of the windings. All coils in cach phase are connected in series. The flux per pole in the machine is 0.060 Wb, and the speed of rolation of the magnetic field is 1000 r/min. (a) What is the frequency of the voltage produced in this winding? (b) What are the resulting phase and terminal voltages of this stator? 3-6. Athree-phase, Y-connected, 60 Hz, two-pole synchronous machine has a stator with 5000 rurns of wire per phase. What rotor flux would be required to produce a termi- nal (line-to-line) voltage of 13.2 kV? 3-7. Modify the MATLAB in Example 3–1 by swapping the currents flowing in any two
(B)-ndicate whether the following statements are true or false and correct the faise statements. -When a series d.c. motor is operate without load, the armature will not run. The strength of magnetic field in d.c. shunt generator can be varied by varying the polarity of the field poles The main disadvantage of series generators is Output voltage varies as the Toad varies There is no output from the transformer under short-circuit conditions
2- A 4-pole, wave-wound d.c. shunt generator has an armature winding consisting of 300 turns each of 0.0020. The armature resistance is a) 0.152 b)0.62 c) 0.30 d) none of above