A coil is wound with 300 turns over a steel ring of relative permeability 900 having a mean circumference of 400 mm and a cross-sectional area of 500 mm 2 . If the coil has a resistance of 8 Ω and is...



A coil is wound with 300 turns over a steel ring of relative permeability 900 having a mean circumference of 400 mm and a cross-sectional area of 500 mm2


. If the coil has a resistance of 8
Ω

and is connected across a 20V dc supply, using a neat sketch, calculate:




a).The coil magneto-motive force




b).The magnetic field leakage factor1.25 strength




c).The total flux




d).The reluctance of the ring




e).The permeance of the ring and




f).The flux density in the ring






2). An iron ring has a mean diameter of 15cm, a cross-section area of 20cm2
and a radial air gap of 0.5cm cut in it. It is uniformly wound with 1500 turns of insulated wire
and
a
magnetizing current of 1A produces a magnetic flux of 1mWb. Neglecting the effect of magnetic leakage and fringing, calculate




a). reluctance of the magnetic circuit and




b). relative permeability of iron







3). A circular iron ring has a mean circumference of 1.5m and a cross-sectional area of 0.01m2. A saw-cut of 4mm wide is made in the ring. Calculate the magnetizing current required to produce
a magnetic flux of 0.8mWb in the air gap if the ring is wound with a coil of 175 turns. Assume relative permeability of iron as 400 and leakage factor as 1.25






4(a). A dc generator has 136 conductors in series. Each conductor has an effective length of 15cm, is constrained to move in a circular path of radius 12cm and lies in a uniform field of flux density of 1.2 Tesla. Calculate the emf generated when the armature rotates at 1400rpm






(b). A coil of 2500 turns has a flux of 10mWb linking with it when carrying a current of 2A. Calculate the coil inductance and the emf induced in the coil when he current collapses to zero in 20msl




Mar 23, 2022
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