Alternating Current and Voltage problems
- 1. The average value of a 12 V peak sine wave over one complete cycle is
Options- A. 0 V
- B. 1.27 V
- C. 7.64 V
- D. 6.37 V Discuss
Correct Answer: 0 V
- 2. If the peak of a sine wave is 13 V, the peak-to-peak value is
Options- A. 6.5 V
- B. 13 V
- C. 26 V
- D. none of the above Discuss
Correct Answer: 26 V
- 3. 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
Correct Answer: Wave A leads wave B by 15°.
- 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
Correct Answer: the magnitude and a quantity direction
- 5. 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
Correct Answer: 25%
- 6. 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
Correct Answer: 39.6 mA
- 7. 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
Correct Answer: 25.48 V
- 8. 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 Discuss
Correct Answer: 400 rps
- 9. 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
Correct Answer: 2 µs
- 10. 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
Correct Answer: 35 V
More in Electrical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.