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Electrical Engineering · Q16

Transformers

Engineering and GATE · Electrical Engineering · question 16

Q16

The value of flux involved m the e.m.f. equation of a transformer is

A.
average value
B.
r.m.s. value
C.
maximum value
Answer
D.
instantaneous value

Answer: Option C

Solution

Answer: Option C
Solution:
The value of flux involved in the e.m.f. equation of a transformer is

Given by:
E = 4.44 * f * N * Φmax

where:
E is the induced e.m.f.
f is the frequency of the AC supply
N is the number of turns in the coil
Φmax is the maximum flux

The e.m.f. equation of a transformer involves the maximum value of the magnetic flux (Φmax) because the equation is derived based on the peak value of the sinusoidal flux waveform.

Therefore, the correct answer is Option C: maximum value.