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Transformers

Transformers
Material used for construction of transformer core is usually

Wood
Aluminium
Copper
Silicon steel

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Transformers
Natural air cooling is generally restricted for transformers up to

50 MVA
1.5 MVA
5 MVA
15 MVA

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Transformers
Transformer having ratings less than 5kVA are generally ______

Oil cooled
Water cooled
Natural air cooled
None of the listed here

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Transformers
The noise produced by a transformer is termed as

hum
buzz
ringing
zoom

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Transformers
A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?

7.3 V
880 V
88 V
73 V

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Transformers
The turns ratio required to match an 80 source to a 320 load is

80
2
4
20

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