Electrical Engineering - Transformers
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Exercise"Hold a true friend with both hands."
- (Proverb)
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| 6. |
The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8? |
Answer: Option B
Explanation:
V2/V1 = N2/N1
Turns ratio = N2/N1 = 8.
V2/110 = 8
V2 = 8 x 110
V2 = 880v.
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| 7. |
To step 110 V ac down to 20 V ac, the turns ratio must be |
Answer: Option C
Explanation:
Vp/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 0.
For simulation: Step-Down Transformer Circuit Simulator.
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| 8. |
The mutual inductance when k = 0.65, L1 = 2  H, and L2 = 5 H is |
Answer: Option D
Explanation:
No answer description available for this question. Let us discuss.
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| 9. |
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is |
Answer: Option D
Explanation:
No answer description available for this question. Let us discuss.
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| 10. |
A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120  . What is the approximate voltage across the load? |
Answer: Option B
Explanation:
No answer description available for this question. Let us discuss.
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