SSC JE Electrical Engineering 2017 Set 3 Paper

Question : 174 of 200

Marks: +1, -0

A transformer has a core loss of 64W and copper loss of 144W, when it is carrying 20% overload current. The load at which this transformer will operate at the maximum efficiency____

80%
66%
120%
44%

Validate

Solution:

_i

) core loss = 64w
(W

_\cu

) copper loss = 144 w

x=√{w_i/w_\cu}

x = percentage of loading

x=√{64/144}=8/12

efficiency at 20% of overload current
=

120×8/12=80%

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