sac

b. Give a few seminaries and dissimilarities of electric circuits and magnetic Circuit, (4)

13

14

15

16

An iron ring has a diameter of 21 cm and a cross sectional area of 10 cm . Thering is
made up of semicircular sections of cast iron and cast steel, with joint having a
reluctance producing an air gap of 0.2 mm. Find the ampere-turns

required to produce a flux of 8 mWb, The relative permeability of cast steel
(10) and cast iron are 800 and 166 respectively,

Find the RMS value , Average value and form factor of the waveform showi'

(10)

A non- inductive resistance is eonneeted in series with
a practical inductive coil. The circuit is supplied with
250 V' 50 Hz supply, When a current of 5A flows through
the circuit, the magnitude Of voltage drop across the
resistance and coil are 125 V and 200 V respectively,
Calculate (i) the impedance, resistance and reactance of
the coil (ii) Power absorbed by the coil and (iii) Total
power. Also draw the phasor diagram

a Calculate the value Of R in the circuit shown in figure
such that the circuit will resonate

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