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- Question
A step-down transformer has a turns ratio less than 1.
Options- A. True
- B. False
- Correct Answer
- True
ExplanationNs/Np is known as the turns ratio.
In step down transformer the number of turns in secondary winding (Ns) will be less than the number of turns in primary (Np).
Therefore, the ratio will be less than 1 for step down transformer.
Ex: Np = 10, Ns = 5; Turns ratio = 5/10 = 0.5.
Transformers problems
Search Results
- 1. If the voltage is stepped up, the current is stepped down, and vice versa.
Options- A. True
- B. False Discuss
Correct Answer: True
- 2. A center tap (CT) is a connection at the midpoint of the secondary winding of a transformer.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. The primary is the winding connected to the source, and the secondary is the winding connected to the load.
Options- A. True
- B. False Discuss
Correct Answer: True
- 4. A step-up transformer steps up power.
Options- A. True
- B. False Discuss
Correct Answer: False
- 5. A transformer changes ac to dc.
Options- A. True
- B. False Discuss
Correct Answer: False
- 6. The phase angle (?) of a series RL circuit varies directly with frequency.
Options- A. True
- B. False Discuss
Correct Answer: True
- 7. A power factor of 1 indicates a purely reactive circuit, and a power factor of 0 indicates a purely resistive circuit.
Options- A. True
- B. False Discuss
Correct Answer: False
- 8. Total current in an RL circuit always lags the source voltage.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. In a lag network, the output voltage lags the input voltage in phase.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. The resistor voltage in an RL circuit is always out of phase with the current.
Options- A. True
- B. False Discuss
Correct Answer: False
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