SSC JE Electrical Engineering 23 Jan 2018 Evening Paper

Question : 130 of 200

Marks: +1, -0

Determine the maximum flux density (in T) of a material having eddy current coefficient of 2, thickness of 4 mm, volume of 20 cu. meter, which is supplied by a frequency of 50 Hz when the material has eddy current loss of 6 W.

2.24
3.34
1.94
1.21

Validate

Solution:

eddy current loss

= B_m^2×f^2×t^2×V×K_e

B_m

flux density in Tesla
t = thickness of material in meter
V = volume of material in

m^3

f = supply frequency in HL

6=2×B_m^2×50^2×(4×10^{-3})^2×20

⇒B_m^2=3.75

⇒B_m=1.94\Tesla

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