Electrical Engineering - Transformers

Exercise :: Transformers - General Questions

16. 

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?

A. 8
B. 0.8
C. 0.08
D. 80

Answer: Option C

Explanation:

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17. 

A transformer

A. changes ac to dc
B. changes dc to ac
C. steps up or down dc voltages
D. steps up or down ac voltages

Answer: Option D

Explanation:

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18. 

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

A. 0 V
B. 6 V
C. 18 V
D. 2 V

Answer: Option A

Explanation:

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19. 

To step 120 V ac up to 900 V ac, the turns ratio must be

A. 75
B. 750
C. 7.5
D. 0.13

Answer: Option C

Explanation:

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20. 

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

A. 50
B. 12.5
C. 800
D. 0

Answer: Option B

Explanation:

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