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TS EAMCET 7 May 2018 Shift 1 Solved Paper
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© examsnet.com
Question : 113
Total: 160
A distribution transformer with an efficiency of 90% supplies to a colony of 10 homes. All the 10 homes have electrical oven running at the same time, that draw 20 A current from 220 V hues. The power dissipated as heat in the transformer is
12.2 kW
4.9 kW
8.4 kW
9.9 kW
Validate
Solution:
The power consumed by the 10 ovens can be calculated as,
P
=
10
(
V
I
)
P
=
10
(
220
×
20
)
P
=
44
×
10
3
W
The efficiency of the transformer is
90
%
P
′
=
100
90
P
P
′
=
100
90
×
44
×
10
3
P
′
=
48.9
k
W
The amount of power wasted as heat,
H
=
P
′
−
P
H
=
48.9
−
44
H
=
4.89
≈
4.9
k
W
© examsnet.com
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