ISCI | ECCI / ECII 2021
ASSIGNMENT
Q 1. A mild steel ring having a cross-sectional area of 300mm² and a mean circumference of 350 mm has a coil of 250 turns wound uniformly around it.
Calculate the following:
(a) reluctance of the ring,
(b) current required to produce a flux of 600 ?Wb in the ring,
(c) magnetic field strength.
Take ?r for mild steel = 380
?o = 4? x 10??
Q 2. A coil having a resistance of 2 k? and inductance of 30 H is connected in series with a variable capacitor to a 240V, 50Hz ac supply.
Determine:
(a) value of the capacitance to cause resonance,
(b) current flowing in the circuit at resonance,
(c) p.d. across the inductor and capacitor at resonance,
(d) power dissipated,
(e) Q-factor.
