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Transformers

Transformers
A transformer does not posses ______changing property.

Power
Voltage
Impedance
Current

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Transformers
Transformer having ratings less than 5kVA are generally ______

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

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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 ?

62500 Ω
25 Ω
250 Ω
6250 Ω

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Transformers
When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

120 V
240 V
12 V
2,400 V

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

5
25
0.2
0.4

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Transformers
Power transformers are generally designed to have maximum efficiency around

10% overload
no-load
half-load
near full-load

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