electronics-transformers Related Question Answers
1. What is the secondary voltage in the given circuit?
2. The transformer turns ratio determines
3. Mutual induction is dependent on
5. What is the power dissipated in the primary of the transformer in the given circuit?
6. A special transformer used to convert unbalanced signals to balanced signals is the
7. If the load doubled in value in the given circuit, what reflected resistance would the source see?
8. If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is
9. A transformer has
10. If voltage is stepped-up to the secondary, current will be stepped-down by the same amount.
11. In the given circuit, the secondary voltage is in phase with the primary voltage.
12. The reflected load value that the source sees will always be larger than the load value itself.
13. An open secondary winding of a transformer will cause the primary current to be nearly zero.
14. The secondary voltages produced by a center-tapped transformer are equal in amplitude but 180° out of phase with respect to the center tap.
15. A transformer that has 700 turns in the primary and 35 turns in the secondary has a turns ratio of 20:1.
16. Regardless of whether the transformer is step-up or step-down, power in the primary equals the power in the secondary if there is 100% efficiency.
18. For mutual inductance to occur, the two coils must be at right angles to each other.
19. If the current drawn in the secondary of a transformer increases, the power in the primary should remain the same.
20. To ensure a high coefficient of coupling, all fixed transformers are usually wound on a(n) _____________.
21. The reflected resistance is ___ as seen by the source in the given circu.
23. Making the load resistance appear the same as the source's internal resistance is called _____.
24. A transformer turns ratio of ________ will be needed to match an output impedance of 5 k to an 8 speaker.
25. ___ occurs in a transformer when some of the primary flux lines pass through the air instead of the core.
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