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A1108 Pages: 3

resistor in the circuit below.

An iron ring has a diameter of 21 cm and a cross sectional area of 10 0122, The (10)
ring is made up of semicircular sections of cast iron and cast steel with 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 and cast iron are 800 and 166, respectively.

Compare (by writing both similarities and differences) electric and magnetic (6)
circuits.

Derive the equivalent reluctance of two magnetic circuits in parallel. (4)

Determine the RMS and average values of tlie current waveform shown below. (10)

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10

A non inductive resistor of 10Q is connected in series with ೩ choke coil having 9 (10)
internal resistance of 1.2 Q and is fed from a 200 V, 50 Hz supply. The current
flowing through the circuit is 8 A. Calculate (i) Inductance of the choke coil (ii)
Voltage across the choke coil (iii) Power absorbed by the choke coil (iv) Power
absorbed by the non-inductive resistor (v) Phasor diagram of voltage.
PART C
Answer any one full question from each module, each carries10 marks.

Module V
A 50Hz sinusoidal voltage of (40+j30) V is applied to a series RL circuit (10)

resulting in a current of (4+j1) A. Calculate (i) Impedance of the circuit (ii)

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