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Transformers

Transformers
Which of the following is not a fitting on a transformer?

Buchholz's relay
Conservator
Commutator
Breather

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Transformers
Harmonics in transformer result in

increased core losses
magnetic interference with communication circuits
increased I2R losses
All of the listed here

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Transformers
In a transformer, leakage flux

Helps in transfer of energy
Produces mutually induced emf
Is negligible at full load
Is minimised by interleaving the primary and secondary windings

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Transformers
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is

25 W
2.5 W
0 W
250 W

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Transformers
A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 . The load resistance as seen by the source is

78 Ω
1.3 Ω
7.8 Ω
13 Ω

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Transformers
When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

0.75 V
0 V
48 V
6 V

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MORE MCQ ON Transformers

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