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Home ‣ Electrical Engineering ‣ Three-Phase Systems in Power Applications See What Others Are Saying!
- Question
Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 Ω.
Options- A. single-phase 32 A; three-phase 16 A
- B. single-phase 16 A; three-phase 8 A
- C. single-phase 8 A; three-phase 4 A
- D. single-phase 16 A; three-phase 0 A
- Correct Answer
- single-phase 16 A; three-phase 8 A
- 1. A short in a series circuit prevents current.
Options- A. True
- B. False Discuss
- 2. Three hundred joules of energy are consumed in 15 s. The power is
Options- A. 2,000 W
- B. 2 W
- C. 20 W
- D. 200 W Discuss
- 3. An autotransformer is one in which the primary and secondary are automatically coupled.
Options- A. True
- B. False Discuss
- 4. The tesla is the unit of magnetic flux.
Options- A. True
- B. False Discuss
- 5. Watt's law states the relationships of power to energy.
Options- A. True
- B. False Discuss
- 6. The capacitor voltage always leads the current by 90°.
Options- A. True
- B. False Discuss
- 7. If a 6 V and a 9 V source are connected series aiding, the total voltage is
Options- A. 6 V
- B. 9 V
- C. 3 V
- D. 15 V Discuss
- 8. Total current in an RC circuit always leads the source voltage.
Options- A. True
- B. False Discuss
- 9. In 40 kW, there are
Options- A. 0.4 mW
- B. 40,000 W
- C. 400 W
- D. 5,000 W Discuss
- 10. Energy is stored by a capacitor in a magnetic field.
Options- A. True
- B. False Discuss
More questions
Correct Answer: False
Correct Answer: 20 W
Correct Answer: False
Correct Answer: False
Correct Answer: False
Correct Answer: False
Correct Answer: 15 V
Correct Answer: True
Correct Answer: 40,000 W
Correct Answer: False
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