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- Question
To step 110 V ac down to 20 V ac, the turns ratio must be
Options- A. 5.5
- B. 18
- C. 0.18
- D. 0.018
- Correct Answer
- 0.18
ExplanationVp/Vs = Np/Ns
Vs = (Ns/Np)Vp
We required turns ratio i.e., (Ns/Np)
= Vs/Vp
= 20/110
= 0.181818182
[Note: p - primary; s - secondary]
For step down transfer, the turns ratio will be less than 1.
For simulation: Step-Down Transformer Circuit Simulator.
More questions
- 1. The capacitor voltage always leads the current by 90°.
Options- A. True
- B. False Discuss
Correct Answer: False
- 2. 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
- 3. Total current in an RC circuit always leads the source voltage.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. 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
- 5. Energy is stored by a capacitor in a magnetic field.
Options- A. True
- B. False Discuss
Correct Answer: False
- 6. A filter passes all frequencies.
Options- A. True
- B. False Discuss
Correct Answer: False
- 7. A series circuit acts as a current divider.
Options- A. True
- B. False Discuss
Correct Answer: False
- 8. A transformer responds only to dc.
Options- A. True
- B. False Discuss
Correct Answer: False
- 9. 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
- 10. 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
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