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Transformers

Transformers
Natural air cooling is generally restricted for transformers up to

15 MVA
50 MVA
1.5 MVA
5 MVA

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Transformers
Distribution transformers are generally designed for maximum efficiency around

Zero load
90% load
25% load
50% load

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Transformers
A transformer transfers electrical energy from primary to secondary usually with a change in ______

Power
Voltage
Frequency
Time period

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Transformers
The steel used for transformer core has

All of the listed here
High permeability
Low hysteresis loss
High silicon content

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Transformers
Short circuit test of a transformer helps us to find its

Cu loss at no load
Full load cu loss
Iron loss
None of the listed here

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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
88 V
880 V
73 V

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