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Home ‣ Electrical Engineering ‣ Three-Phase Systems in Power Applications Comments
- Question
In a certain Y-Y system, the source phase currents each have a magnitude of 9 A. The magnitude of each load current for a balanced load condition is
Options- A. 3 A
- B. 6 A
- C. 9 A
- D. 27 A
- Correct Answer
- 9 A
- 1. A two-phase generator is connected to two 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?
Options- A. 1.33 A
- B. 1.88 A
- C. 2.66 A
- D. 1.77 A Discuss
- 2. A three-phase generator is connected to three 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?
Options- A. 0 A
- B. 1.33 A
- C. 3.99 A
- D. 2.66 A Discuss
- 3. In a Y-Y source/load configuration, the
Options- A. phase current, the line current, and the load current are all equal in each phase
- B. phase current, the line current, and the load current are 120° out of phase
- C. phase current and the line current are in phase, and both are 120° out of phase with the load current
- D. line current and the load current are in phase, and both are out of phase with the phase current Discuss
- 4. 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 Discuss
- 5. A single-phase sinusoidal voltage of 120 V is connected to a 90 Ω load. Current in the circuit is
Options- A. 13.3 mA
- B. 133 mA
- C. 1.33 A
- D. 6.2 A Discuss
- 6. In a three-phase system, the voltages are separated by
Options- A. 45°
- B. 90°
- C. 120°
- D. 180° Discuss
- 7. In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of
Options- A. 0°
- B. 30°
- C. 60°
- D. 120° Discuss
- 8. In a Y-connected source feeding a △-connected load,
Options- A. each phase of the load has one-third of the full line voltage across it
- B. each phase of the load has two-thirds of the full line voltage across it
- C. each phase of the load has the full line voltage across it
- D. each phase of the load has a voltage across it equal to
Discuss
- 9. A red, red, orange, gold resistor has a nominal value of
Options- A. 22,000 Ω
- B. 2,200 Ω
- C. 22 Ω
- D. 2.2 Ω Discuss
- 10. The maximum resistance value for a brown, red, yellow, gold resistor is
Options- A. 126,000 Ω
- B. 126,600 Ω
- C. 114,000 Ω
- D. 132,000 Ω Discuss
Three-Phase Systems in Power Applications problems
Search Results
Correct Answer: 1.77 A
Correct Answer: 0 A
Correct Answer: phase current, the line current, and the load current are all equal in each phase
Correct Answer: single-phase 16 A; three-phase 8 A
Correct Answer: 1.33 A
Correct Answer: 120°
Correct Answer: 30°
Correct Answer: each phase of the load has the full line voltage across it
Correct Answer: 22,000 Ω
Correct Answer: 126,000 Ω
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