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Transformers

Transformers
The approximate efficiency of a large transformer is

95%
50%
65%
80%

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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 ?

25 Ω
250 Ω
6250 Ω
62500 Ω

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Transformers
The power efficiency of a lightning transformer is always ______its all day efficiency.

Equal to
Less than
None of the listed here
Higher than

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

Voltage
Frequency
Time period
Power

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Transformers
The open circuit test on a transformer is always made on ______

High voltage winding
Low voltage winding
Either low or high voltage winding
None of the listed here

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Transformers
Negative voltage regulation is indicative that the load is

None of these
inductive or resistive
inductive only
capacitive only

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