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- Question
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
- Correct Answer
- 880 V
ExplanationV2/V1 = N2/N1
Turns ratio = N2/N1 = 8.
V2/110 = 8
V2 = 8 x 110
V2 = 880v.
More questions
- 1. Referring to Problem 15, if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude?
Options- A. 6 V
- B. 597 mV
- C. 5.97 V
- D. 0 V Discuss
Correct Answer: 5.97 V
- 2. The minimum resistance value for a blue, gray, red, silver resistor is
Options- A. 612 Ω
- B. 6,120 Ω
- C. 6,800 Ω
- D. 6,460 Ω Discuss
Correct Answer: 6,120 Ω
Explanation:
Because of 10% tolerance(last color silver), this resistance may vary 10% of 6800.Minimum resistance value = 6800 - 680 = 6120
Maximum resistance value = 6800 + 680 = 7480
- 3. Four 8 Ω speakers are connected in parallel to the output of an audio amplifier. If the maximum voltage to the speakers is 12 V, the amplifier must be able to deliver to the speakers
Options- A. 18 W
- B. 1.5 W
- C. 48 W
- D. 72 W Discuss
Correct Answer: 72 W
- 4. Referring to circuit given, if R1 is changed to a 68 Ω resistor, what will be the current through it?
Options- A. 0.16 A
- B. 0.24 A
- C. 0.2 A
- D. 0.04 A Discuss
Correct Answer: 0.16 A
- 5. The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is
Options- A. 1,000 V
- B. 2,000 V
- C. 31.25 V
- D. 3,125 V Discuss
Correct Answer: 2,000 V
- 6. A 10 Ω resistor, a 90 mH coil, and a 0.015 µF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is
Options- A. 1,616 Ω
- B. 161 Ω
- C. 3,387 Ω
- D. 1,771 Ω Discuss
Correct Answer: 1,616 Ω
- 7. Approximately how much current flows through a 3.3 MΩ resistor across a 30 V source?
Options- A. 9 µA
- B. 90 µA
- C. 900 µA
- D. 9000 µA Discuss
Correct Answer: 9 µA
- 8. 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
Correct Answer: 111.5 W
- 9. A balanced load is one in which all the impedances are equal.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. A 470 Ω resistor, a 220 Ω resistor, and a 100 Ω resistor are all in parallel. The total resistance is approximately
Options- A. 790 Ω
- B. 470 Ω
- C. 60 Ω
- D. 30 Ω Discuss
Correct Answer: 60 Ω
Explanation:
1/R = (1/470 + 1/220 + 1/100)
R = 59.98 ohm
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