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Transformers

Transformers
A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

0.4
5
0.2
25

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Transformers
The temperature rise of transformer is directly proportional to _______

Reactive power
None of the listed here
Leakage reactance
Apparent power

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Transformers
Which winding of the transformer has less cross-sectional area?

High voltage winding
Low voltage winding
Primary winding
Secondary winding

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Transformers
Which of the following is the main advantage of an auto-transformer over a two winding transformer?

Eddy losses are totally eliminated
Copper losses are negligible
Hysteresis losses are reduced
Saving in winding material

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Transformers
If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 ?

6250 Ω
62500 Ω
250 Ω
25 Ω

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

80
4
20
2

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