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# Electrical Engineering - Transformers

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### Exercise

"I never think of the future. It comes soon enough."
- Albert Einstein
21.

In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

 A. 0 W B. 14.1 W C. 111.5 W D. 1,020 W

22.

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

 A. 0 V B. 6 V C. 48 V D. 0.75 V

23.

What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?

 A. 0.4 B. 4 C. 9.6 D. 0.96

24.

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

 A. 1.3 B. 7.8 C. 78 D. 13