Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > The initiation of electric arc at the instant...
Start Learning for Free
The initiation of electric arc at the instant of contact separation is caused by
- a)thermionic emission of electrons.
- b)field emission of electrons
- c)(a) and (b) both.
- d)none of the above
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The initiation of electric arc at the instant of contact separation is...
Thermionic and Field Emission in Electric Arc Initiation
Thermionic emission and field emission are the two main mechanisms responsible for the initiation of an electric arc at the instant of contact separation.
Thermionic Emission
- Thermionic emission occurs when electrons are emitted from a heated surface.
- In the case of an electric arc, when the contacts are separated, the high temperature generated at the contact points causes thermionic emission of electrons.
- These emitted electrons create a path for the electric arc to form between the contacts.
Field Emission
- Field emission is the emission of electrons from a solid surface in the presence of a strong electric field.
- When the contacts are separated, a strong electric field is established due to the potential difference between the contacts.
- This electric field causes field emission of electrons from the contact surfaces, further facilitating the formation of the electric arc.
Combination of Thermionic and Field Emission
- In the initiation of an electric arc, both thermionic emission and field emission play crucial roles.
- The high temperature at the contact points leads to thermionic emission, while the strong electric field assists in field emission of electrons.
- The combination of these two mechanisms results in the rapid initiation of the electric arc at the instant of contact separation.
Therefore, the correct answer to the question is option 'C' - (a) Thermionic emission of electrons and (b) Field emission of electrons both contribute to the initiation of an electric arc at the instant of contact separation.
Thermionic emission and field emission are the two main mechanisms responsible for the initiation of an electric arc at the instant of contact separation.
Thermionic Emission
- Thermionic emission occurs when electrons are emitted from a heated surface.
- In the case of an electric arc, when the contacts are separated, the high temperature generated at the contact points causes thermionic emission of electrons.
- These emitted electrons create a path for the electric arc to form between the contacts.
Field Emission
- Field emission is the emission of electrons from a solid surface in the presence of a strong electric field.
- When the contacts are separated, a strong electric field is established due to the potential difference between the contacts.
- This electric field causes field emission of electrons from the contact surfaces, further facilitating the formation of the electric arc.
Combination of Thermionic and Field Emission
- In the initiation of an electric arc, both thermionic emission and field emission play crucial roles.
- The high temperature at the contact points leads to thermionic emission, while the strong electric field assists in field emission of electrons.
- The combination of these two mechanisms results in the rapid initiation of the electric arc at the instant of contact separation.
Therefore, the correct answer to the question is option 'C' - (a) Thermionic emission of electrons and (b) Field emission of electrons both contribute to the initiation of an electric arc at the instant of contact separation.
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Similar Electrical Engineering (EE) Doubts
Top Courses for Electrical Engineering (EE)View all
The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer?
Question Description
The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2025 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 initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer?.
The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2025 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 initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer?.
Solutions for The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. 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 initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The initiation of electric arc at the instant of contact separation is caused bya)thermionic emission of electrons.b)field emission of electronsc)(a) and (b) both.d)none of the aboveCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Electrical Engineering (EE) tests.
|
|
Explore Courses for Electrical Engineering (EE) exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup