Discussion
Home ‣ Electrical Engineering ‣ Alternating Current and Voltage Comments
- Question
To produce an 800 Hz sine wave, a four-pole generator must be operated at
Options- A. 200 rps
- B. 400 rps
- C. 800 rps
- D. 1,600 rps
- Correct Answer
- 400 rps
- 1. The average half-cycle value of a sine wave with a 40 V peak is
Options- A. 25.48 V
- B. 6.37 V
- C. 14.14 V
- D. 50.96 V Discuss
- 2. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is
Options- A. 45.12 mA
- B. 16 mA
- C. 39.6 mA
- D. 22.6 mA Discuss
- 3. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is
Options- A. 25%
- B. 50%
- C. 1%
- D. 100% Discuss
- 4. A phasor represents
Options- A. the magnitude and a quantity direction
- B. the width of a quantity
- C. the phase angle
- D. the magnitude of a quantity Discuss
- 5. Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?
Options- A. Wave A leads wave B by 15°.
- B. Wave A lags wave B by 15°.
- C. Wave A leads wave B by 105°.
- D. Wave A lags wave B by 105°. Discuss
- 6. If a sine wave goes through 10 cycles in 20 µs, the period is
Options- A. 20 µs
- B. 4 µs
- C. 2 µs
- D. 100 µs Discuss
- 7. A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is
Options- A. 6 V
- B. 30 V
- C. 35 V
- D. 0 V Discuss
- 8. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is
Options- A. 0°
- B. 45°
- C. 40°
- D. none of the above Discuss
- 9. A square wave has a period of 60 µs. The first odd harmonic is
Options- A. 5 kHz
- B. 50 kHz
- C. 500 kHz
- D. 33.33 kHz Discuss
- 10. The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is
Options- A. 40 Hz
- B. 100 Hz
- C. 400 Hz
- D. indeterminable Discuss
Alternating Current and Voltage problems
Search Results
Correct Answer: 25.48 V
Correct Answer: 39.6 mA
Correct Answer: 25%
Correct Answer: the magnitude and a quantity direction
Correct Answer: Wave A leads wave B by 15°.
Correct Answer: 2 µs
Correct Answer: 35 V
Correct Answer: 40°
Correct Answer: 50 kHz
Correct Answer: 400 Hz
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