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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.
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- B. False Discuss
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Correct Answer: False
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Correct Answer: True
- 5. The ohm is the unit of capacitance.
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Correct Answer: False
- 6. A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?
Options- A. 2 mA
- B. 2.2 mA
- C. 214 mA
- D. 21.4 mA Discuss
Correct Answer: 2.2 mA
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Options- A. 20 µs
- B. 4 µs
- C. 2 µs
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