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- Question
In a three-phase system, when the loads are perfectly balanced, the neutral current is
Options- A. zero
- B. one-third of maximum
- C. two-thirds of maximum
- D. at maximum
- Correct Answer
- zero
- 1. The flat portions of a pulse waveform contain low-frequency components.
Options- A. True
- B. False Discuss
- 2. In an RC differentiating circuit, the output voltage is taken across the resistor.
Options- A. True
- B. False Discuss
- 3. A certain transformer has 400 turns in the primary winding and 2,000 turns in the secondary winding. The turns ratio is
Options- A. 0.2
- B. 0.4
- C. 5
- D. 25 Discuss
- 4. The rising and falling edges of a pulse waveform contain the higher frequency component.
Options- A. True
- B. False Discuss
- 5. A steady-state condition is reached when
Options- A. the output voltage reaches the average value of the input voltage
- B. the output voltage reaches the input voltage
- C. the output voltage reaches approximately 63% of the input voltage
- D. the output voltage reaches the effective value of the input voltage Discuss
- 6. When a 15 V input pulse with a width equal to two time constants is applied to an RC integrator, the capacitor charges to
Options- A. 15 V
- B. 12.9 V
- C. 8.6 V
- D. 19.45 V Discuss
- 7. The power dissipation in each of four parallel branches is 1.2 W. The total power dissipation is
Options- A. 1.2 W
- B. 4.8 W
- C. 0.3 W
- D. 12 W Discuss
- 8. A three-phase △-connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I ?a = 12 ∠30° A, what are the polar expressions for the other phase currents?
Options- A. I ?b = 12 ∠150° A, I ?c = 12∠?90° A
- B. I ?b = 12∠120° A, I ?c = 12∠30° A
- C. I ?b = 12∠30° A, I ?c = 12∠120° A
- D. I ?b = 12∠90° A, I ?c = 12∠90° A Discuss
- 9. A 6 V battery is connected to a 300 Ω load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?
Options- A. 1 h
- B. 200 h
- C. 2,000 h
- D. 10 h Discuss
- 10. Total parallel capacitance is less than that of the smallest capacitor in parallel.
Options- A. True
- B. False Discuss
More questions
Correct Answer: True
Correct Answer: True
Correct Answer: 5
Correct Answer: True
Correct Answer: the output voltage reaches the average value of the input voltage
Correct Answer: 12.9 V
Correct Answer: 4.8 W
Correct Answer: I ?b = 12 ∠150° A, I ?c = 12∠?90° A
Correct Answer: 2,000 h
Correct Answer: False
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