1. The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?
2. To step 110 V ac down to 20 V ac, the turns ratio must be
3. The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is
4. If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is
5. A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 . What is the approximate voltage across the load?
6. How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?
7. In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is
8. A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is
9. The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 load. The turns ratio is 3:1. What is the secondary voltage?
10. The primary winding of a power transformer should always be
11. A certain amplifier has 600 internal resistance looking from its output. In order to provide maximum power to a 4 speaker, what turns ratio must be used in the coupling transformer?
12. A transformer
13. The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100 . The voltage across the load is
14. To step 120 V ac up to 900 V ac, the turns ratio must be
15. When a 200 load resistor is connected across the secondary winding of a transformer with a turns ratio of 4, the source "sees" a reflective load of
16. 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?
17. When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is
18. 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?
19. 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
20. If the voltage is stepped up, the current is stepped down, and vice versa.
21. A step-down transformer has a turns ratio less than 1.
22. A transformer responds only to dc.
23. The primary is the winding connected to the source, and the secondary is the winding connected to the load.
24. A transformer consists of two or more cores that are electrically coupled on a common core.
25. A reflective load is a load as it appears to the source in the primary of a transformer.