Transformers problems
- 1. When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is
Options- A. 0 V
- B. 6 V
- C. 48 V
- D. 0.75 V Discuss
Correct Answer: 0 V
- 2. A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is
Options- A. 1.3 Ω
- B. 7.8 Ω
- C. 78 Ω
- D. 13 Ω Discuss
Correct Answer: 13 Ω
- 3. When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is
Options- A. 12 V
- B. 120 V
- C. 240 V
- D. 2,400 V Discuss
Correct Answer: 240 V
- 4. What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?
Options- A. 0.4
- B. 4
- C. 9.6
- D. 0.96 Discuss
Correct Answer: 0.96
- 5. A transformer consists of two or more cores that are electrically coupled on a common core.
Options- A. True
- B. False Discuss
Correct Answer: False
- 6. An autotransformer is one in which the primary and secondary are automatically coupled.
Options- A. True
- B. False Discuss
Correct Answer: False
- 7. A reflective load is a load as it appears to the source in the primary of a transformer.
Options- A. True
- B. False Discuss
Correct Answer: True
- 8. A transformer responds only to dc.
Options- A. True
- B. False Discuss
Correct Answer: False
- 9. A transformer changes ac to dc.
Options- A. True
- B. False Discuss
Correct Answer: False
- 10. A step-up transformer steps up power.
Options- A. True
- B. False Discuss
Correct Answer: False
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