SSC JE Electrical Engineering 2013 Paper

Question : 156 of 200

Marks: +1, -0

An inductor is supplied from a sinusoidal voltage source. The magnetic field energy in the inductor changes from peak value to minimum value in 10 msec. The supply frequency is

50 Hz
25 Hz
1 kHz
100 Hz

Validate

Solution:

Magnetic field energy change from peak to minimum value to 10 ms.

For a quarter part of wave energy going down to the maximum value to minimum value

T/4=10×10^{-3}\sec

T=40×10^{-3}\sec

f=1/T=1/{40×10^{-3}}=25\Hz

Go to Question:

Prev Question

Next Question