Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > The induced emf in the armature of a 4-pole d...
Start Learning for Free
The induced emf in the armature of a 4-pole dc machine is
- a)directly proportional to speed and field strength applied to it
- b)directly proportional to speed
- c)directly proportional to field strength applied to it
- d)inversely proportional to speed and inversely proportional to field strength applied to it
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
The induced emf in the armature of a 4-pole dc machine isa)directly pr...
Emf is proportional to speed of rotation and flux.
Most Upvoted Answer
The induced emf in the armature of a 4-pole dc machine isa)directly pr...
Answer:
The induced electromotive force (emf) in the armature of a 4-pole DC machine is directly proportional to the speed and field strength applied to it. This can be explained by Faraday's law of electromagnetic induction.
Faraday's Law:
Faraday's law states that the induced emf in a conductor is directly proportional to the rate of change of magnetic flux passing through the conductor.
Relationship with Speed:
The speed of the armature determines the rate at which the magnetic flux passing through the armature changes. As the armature rotates, the magnetic field lines from the field poles cut across the armature conductors, causing a change in the magnetic flux. The faster the armature rotates, the higher the rate of change of magnetic flux, and thus the higher the induced emf.
Therefore, the induced emf in the armature is directly proportional to the speed of the machine.
Relationship with Field Strength:
The field strength applied to the armature determines the strength of the magnetic field produced by the field poles. A stronger magnetic field will result in a higher rate of change of magnetic flux as the armature rotates. This is because a stronger field will cause a larger number of magnetic field lines to cut across the armature conductors.
Therefore, the induced emf in the armature is directly proportional to the field strength applied to it.
Combined Relationship:
Since the induced emf is directly proportional to both the speed and field strength, the overall relationship can be expressed as:
Induced emf ∝ Speed × Field Strength
In a 4-pole DC machine, the speed is directly proportional to the rotational speed of the armature. And the field strength is determined by the current flowing through the field windings. Thus, the induced emf in the armature is directly proportional to the speed and field strength applied to it.
Therefore, the correct answer is option 'A': The induced emf in the armature of a 4-pole DC machine is directly proportional to the speed and field strength applied to it.
The induced electromotive force (emf) in the armature of a 4-pole DC machine is directly proportional to the speed and field strength applied to it. This can be explained by Faraday's law of electromagnetic induction.
Faraday's Law:
Faraday's law states that the induced emf in a conductor is directly proportional to the rate of change of magnetic flux passing through the conductor.
Relationship with Speed:
The speed of the armature determines the rate at which the magnetic flux passing through the armature changes. As the armature rotates, the magnetic field lines from the field poles cut across the armature conductors, causing a change in the magnetic flux. The faster the armature rotates, the higher the rate of change of magnetic flux, and thus the higher the induced emf.
Therefore, the induced emf in the armature is directly proportional to the speed of the machine.
Relationship with Field Strength:
The field strength applied to the armature determines the strength of the magnetic field produced by the field poles. A stronger magnetic field will result in a higher rate of change of magnetic flux as the armature rotates. This is because a stronger field will cause a larger number of magnetic field lines to cut across the armature conductors.
Therefore, the induced emf in the armature is directly proportional to the field strength applied to it.
Combined Relationship:
Since the induced emf is directly proportional to both the speed and field strength, the overall relationship can be expressed as:
Induced emf ∝ Speed × Field Strength
In a 4-pole DC machine, the speed is directly proportional to the rotational speed of the armature. And the field strength is determined by the current flowing through the field windings. Thus, the induced emf in the armature is directly proportional to the speed and field strength applied to it.
Therefore, the correct answer is option 'A': The induced emf in the armature of a 4-pole DC machine is directly proportional to the speed and field strength applied to it.
Attention Electrical Engineering (EE) Students!
To make sure you are not studying endlessly, EduRev has designed Electrical Engineering (EE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Electrical Engineering (EE).
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Top Courses for Electrical Engineering (EE)View all
The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer?
Question Description
The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer?.
The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer?.
Solutions for The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE).
Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
Here you can find the meaning of The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The induced emf in the armature of a 4-pole dc machine isa)directly proportional to speed and field strength applied to itb)directly proportional to speedc)directly proportional to field strength applied to itd)inversely proportional to speed and inversely proportional to field strength applied to itCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice Electrical Engineering (EE) tests.
|
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup