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# Electrical Engineering - Transformers

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### Exercise

"Hold a true friend with both hands."
- (Proverb)
6.

The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?

 A. 8.8 V B. 88 V C. 880 V D. 8,800 V

7.

To step 110 V ac down to 20 V ac, the turns ratio must be

 A. 5.5 B. 18 C. 0.18 D. 0.018

8.

The mutual inductance when k = 0.65, L1 = 2 H, and L2 = 5 H is

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

9.

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

 A. 25 W B. 0 W C. 250 W D. 2.5 W

10.

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?

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