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Electrical Applications 2 by David W. Tyler

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138 Solutions
to
problems
21 (a) 71.4 A/mm
2
, (b) 18.87 A/mm
2
.
26 (i) Cold-rolled grain-oriented steel, more expensive per tonne
but higher permeability means less weight and overall cost.
Silicon content keeps eddy current losses low.
(ii) Ordinary soft iron, cheap, not so efficient but limited duty
time.
(iii) Dust core or ferrite.
(iv) Air.
27 In presence of strong alternating field.
28 (a) Mumetal or Stalloy. (b) Aluminium or copper.
29
150
W.
30 300 W.
SECTION 5 4 80.
6 (a) 112.5 V, (b) 2.778 A, (c) 187.5 W.
15 (a) 0.67, (b) 0.31.
19 (i)
5.208