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Transformers

Transformers
Natural air cooling is generally restricted for transformers up to

5 MVA
50 MVA
15 MVA
1.5 MVA

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Transformers
Transformer breaths in when

load remains constant
None of these
load on it increases
load on it decreases

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Transformers
The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?

20 V
18 V
2 V
180 V

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Transformers
Sumpner's test is conducted on transformers to determine

temperature
stray losses
None of these
all-day efficiency

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Transformers
The voltage transformation ratio of a transformer is equal to the ratio of

primary turns to secondary turns
secondary current to primary current
secondary terminal voltage to primary applied voltage
secondary induced e.m.f. to primary induced e.m.f.

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Transformers
A transformer has full load copper loss of 400 W. The copper loss at half full load will be _____.

400 W
None of the listed here
100 W
200 W

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