Alternating Current and Voltage Practice Exam - Set 02

Practice Test: Question Set - 02

1. To produce an 800 Hz sine wave, a four-pole generator must be operated at
    (A) 200 rps
    (B) 400 rps
    (C) 800 rps
    (D) 1,600 rps

2. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is
    (A) 25%
    (B) 50%
    (C) 1%
    (D) 100%

3. The angular position of a phasor represents the angle of the sine wave with respect to a reference.
    (A) True
    (B) False

4. If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is
    (A) 15 mA
    (B) 1.5 mA
    (C) 10 mA
    (D) 1 mA

5. The instantaneous value is the voltage or current value of a waveform at its peak.
    (A) True
    (B) False

6. 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
    (A) 0°
    (B) 45°
    (C) 40°
    (D) None of the above

7. The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.
    (A) True
    (B) False

8. If the peak of a sine wave is 13 V, the peak-to-peak value is
    (A) 6.5 V
    (B) 13 V
    (C) 26 V
    (D) None of the above

9. Periodic is characterized by a repetition at fixed time intervals.
    (A) True
    (B) False

10. When a sine wave has a frequency of 100 Hz in 12 s it goes through
    (A) 1/100 cycle
    (B) 12 cycles
    (C) 120 cycles
    (D) 1,200 cycles

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