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# Electrical Engineering - Transformers

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### Exercise

"Everyone is wise until he speaks."
- (Proverb)
11.

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?

 A. 9 V B. 90 V C. 900 V D. 0.9 V

12.

In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage. The secondary current is

 A. one-fourth the primary current B. four times the primary current C. equal to the primary current D. one-fourth the primary current and equal to the primary current

13.

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

 A. 1.7 V B. 0.85 V C. 1 V D. 0 V

14.

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?

 A. 2 V B. 20 V C. 180 V D. 18 V

15.

The primary winding of a power transformer should always be

 A. open B. shorted C. switched D. fused