# Home / EEE / Transformers :: General Questions

### EEE :: Transformers

1. What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?

2.  A. 4 kVA B. 0.25 kVA C. 16 kVA D. 8 kVA   3. The turns ratio required to match an 80 source to a 320 load is

4.  A. 80 B. 20 C. 4 D. 2   5. When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is

6.  A. 12 V B. 120 V C. 240 V D. 2,400 V   7. 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 ?

8.  A. 250 B. 25 C. 6,250 D. 62,500    9. A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is

10.  A. 0.2 B. 0.4 C. 5 D. 25   11. The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

12.  A. 8.8 V B. 88 V C. 880 V D. 8,800 V   13. To step 110 V ac down to 20 V ac, the turns ratio must be

14.  A. 5.5 B. 18 C. 0.18 D. 0.018   15. The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is

16.  A. 2 mH B. 2 H C. 4 H D. 8 H   17. 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

18.  A. 25 W B. 0 W C. 250 W D. 2.5 W   19. 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?

20.  A. 7.3 V B. 73 V C. 88 V D. 880 V   