Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
273 views
in General by (237k points)
closed by

The average EMF per conductor in an alternator is:


1. 2π f ϕ V
2. 2.2 f ϕ V
3. \( {2 \over \pi } f ϕ ~\;V\)
4. 2 f ϕ V

1 Answer

0 votes
by (239k points)
selected by
 
Best answer
Correct Answer - Option 4 : 2 f ϕ V

In Alternator due to relative movement between conductor and magnetic field an EMF is induced in the stator conductor (Faraday’s Law of electromagnetic induction).

P = Number of poles

φ = Useful flux per pole in weber

f = Frequency of the induced emf equal to (NP/120) Hz

N = Rotational speed in rpm

Total flux cut to complete one revolution = Pφ

Time taken to complete one revolution = 60/N

According to faraday's law of electromagnetic induction

Average emf induced/conductor = Flux cut/time taken \( = \;\frac{{Pϕ }}{{\frac{{60}}{N}}} = \;\frac{{Pϕ N}}{{60}} = \;\frac{{Pϕ }}{{60}} \times \frac{{120f}}{P} = 2fϕ \)

∴ Average EMF induced per conductor is 2fϕ volts.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...