Discussion
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- Question
The mutual inductance when k = 0.65, L1 = 2 µH, and L2 = 5 µH is
Options- A. 2 mH
- B. 2 µH
- C. 4 µH
- D. 8 µH
- Correct Answer
- 2 µH
- 1. A certain amplifier has 600 Ω internal resistance looking from its output. In order to provide maximum power to a 4 Ω speaker, what turns ratio must be used in the coupling transformer?
Options- A. 8
- B. 0.8
- C. 0.08
- D. 80 Discuss
- 2. 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
- 3. If a transformer has 50 turns in the primary winding and 10 turns in the secondary winding, what is the reflective resistance if the secondary load resistance is 250 Ω?
Options- A. 250 Ω
- B. 25 Ω
- C. 6,250 Ω
- D. 62,500 Ω Discuss
- 4. The primary winding of a transformer has 110 V ac across it. What is the secondary voltage if the turns ratio is 8?
Options- A. 8.8 V
- B. 88 V
- C. 880 V
- D. 8,800 V Discuss
- 5. What kVA rating is required for a transformer that must handle a maximum load current of 8 A with a secondary voltage of 2 kV?
Options- A. 4 kVA
- B. 0.25 kVA
- C. 16 kVA
- D. 8 kVA Discuss
- 6. The turns ratio required to match an 80 Ω source to a 320 Ω load is
Options- A. 80
- B. 20
- C. 4
- D. 2 Discuss
- 7. A transformer
Options- A. changes ac to dc
- B. changes dc to ac
- C. steps up or down dc voltages
- D. steps up or down ac voltages Discuss
- 8. The primary winding of a power transformer should always be
Options- A. open
- B. shorted
- C. switched
- D. fused Discuss
- 9. The primary coil of a transformer is connected to a 60 V ac source. The secondary coil is connected to a 330 Ω load. The turns ratio is 3:1. What is the secondary voltage?
Options- A. 2 V
- B. 20 V
- C. 180 V
- D. 18 V Discuss
- 10. 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 Discuss
Transformers problems
Search Results
Correct Answer: 0.08
Correct Answer: 7.5
Correct Answer: 6,250 Ω
Correct Answer: 880 V
Explanation:
V2/V1 = N2/N1
Turns ratio = N2/N1 = 8.
V2/110 = 8
V2 = 8 x 110
V2 = 880v.
Turns ratio = N2/N1 = 8.
V2/110 = 8
V2 = 8 x 110
V2 = 880v.
Correct Answer: 16 kVA
Correct Answer: 2
Correct Answer: steps up or down ac voltages
Correct Answer: fused
Correct Answer: 20 V
Correct Answer: 90 V
Explanation:
We know that, V2/V1 = N2/N1.
Given V2 = 9v, N2/N1 = 0.1
Therefore, 9v/V1 = 0.1
V1 = 9v/0.1 = 90v.
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.
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