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- Question
A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is
Options- A. 1.3 Ω
- B. 7.8 Ω
- C. 78 Ω
- D. 13 Ω
- Correct Answer
- 13 Ω
- 1. When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is
Options- A. 0 V
- B. 6 V
- C. 48 V
- D. 0.75 V Discuss
- 2. 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
Options- A. 25 W
- B. 0 W
- C. 250 W
- D. 2.5 W Discuss
- 3. A transformer with a 110 V primary has a 15:1 turns ratio. The load resistance, RL, is 120 Ω. What is the approximate voltage across the load?
Options- A. 7.3 V
- B. 73 V
- C. 88 V
- D. 880 V Discuss
- 4. In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?
Options- A. 0 W
- B. 14.1 W
- C. 111.5 W
- D. 1,020 W Discuss
- 5. The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100 Ω. The voltage across the load is
Options- A. 0 V
- B. 6 V
- C. 18 V
- D. 2 V Discuss
- 6. When the turns ratio of a transformer is 20 and the primary ac voltage is 12 V, the secondary voltage is
Options- A. 12 V
- B. 120 V
- C. 240 V
- D. 2,400 V Discuss
- 7. What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?
Options- A. 0.4
- B. 4
- C. 9.6
- D. 0.96 Discuss
- 8. In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is
Options- A. 6 A
- B. 424 mA
- C. 4.24 A
- D. 42.4 A Discuss
- 9. Referring to Problem 23, the reactive power is
Options- A. 10 mVAR
- B. 100 mVAR
- C. 6.76 mVAR
- D. 148 mVAR Discuss
- 10. When the frequency is decreased, the impedance of a parallel RL circuit
Options- A. increases
- B. decreases
- C. remains constant
- D. is not a factor Discuss
Transformers problems
Search Results
Correct Answer: 0 V
Correct Answer: 25 W
Correct Answer: 7.3 V
Correct Answer: 111.5 W
Correct Answer: 0 V
Correct Answer: 240 V
Correct Answer: 0.96
Correct Answer: 4.24 A
Correct Answer: 100 mVAR
Correct Answer: decreases
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