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- Question
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?
Options- A. 9 V
- B. 90 V
- C. 900 V
- D. 0.9 V
- Correct Answer
- 90 V
ExplanationWe know that, V2/V1 = N2/N1.
Given V2 = 9v, N2/N1 = 0.1
Therefore, 9v/V1 = 0.1
V1 = 9v/0.1 = 90v.For more detail: Step Down Transformer - Circuit with Simulation.
More questions
- 1. If a 6 V and a 9 V source are connected series aiding, the total voltage is
Options- A. 6 V
- B. 9 V
- C. 3 V
- D. 15 V Discuss
Correct Answer: 15 V
- 2. Total current in an RC circuit always leads the source voltage.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. In 40 kW, there are
Options- A. 0.4 mW
- B. 40,000 W
- C. 400 W
- D. 5,000 W Discuss
Correct Answer: 40,000 W
- 4. Energy is stored by a capacitor in a magnetic field.
Options- A. True
- B. False Discuss
Correct Answer: False
- 5. A filter passes all frequencies.
Options- A. True
- B. False Discuss
Correct Answer: False
- 6. A series circuit acts as a current divider.
Options- A. True
- B. False Discuss
Correct Answer: False
- 7. A transformer responds only to dc.
Options- A. True
- B. False Discuss
Correct Answer: False
- 8. A half-watt is equal to how many milliwatts?
Options- A. 5,000 mW
- B. 5 mW
- C. 500 mW
- D. 50 mW Discuss
Correct Answer: 500 mW
- 9. To step 120 V ac up to 900 V ac, the turns ratio must be
Options- A. 75
- B. 750
- C. 7.5
- D. 0.13 Discuss
Correct Answer: 7.5
- 10. 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
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