If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W

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Question
If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is
Options
A. 100 W
B. 50 W
C. 75 W
D. 200 W

Correct Answer

100 W

Transformers problems

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1. When does maximum power transfer happen from the source to the load?
Options
A. When the source resistance is greater than the load resistance
B. When the source resistance is less than the load resistance
C. When there is negligible source resistance
D. When the source resistance equals the load resistance

2.

What is the secondary voltage in the given circuit?
Options
A. 13.3 V rms in phase with the primary
B. 120 V rms in phase with the primary
C. 13.3 V rms out of phase with the primary
D. 120 V rms out of phase with the primary

6. A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 Ω load. What is the efficiency of the transformer?
Options
A. 88%
B. 90%
C. 92%
D. 95%

8. Often a common-collector will be the last stage before the load; the main function of this stage is to
Options
A. provide voltage gain
B. buffer the voltage amplifiers from the low-resistance load
C. provide phase inversion
D. provide a high-frequency path to improve the frequency response

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