MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Alternating Current and Voltage knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If the peak value of a sine wave is 30 V, the rms value is |
| A. | 7.07 V |
| B. | 0.707 V |
| C. | 23.10 V |
| D. | 19.08 V |
| Answer» D. 19.08 V | |
| 2. |
What is the instantaneous peak voltage at 250° on a 6 V peak sine wave? |
| A. | +5.64 V |
| B. | –5.64 V |
| C. | +26.13 V |
| D. | –26.13 V |
| Answer» C. +26.13 V | |
| 3. |
If the rms current through a 6.8 k resistor is 8 mA, the rms voltage drop across the resistor is |
| A. | 5.44 V |
| B. | 54.4 V |
| C. | 7.07 V |
| D. | 8 V |
| Answer» C. 7.07 V | |
| 4. |
A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is |
| A. | 4 V |
| B. | 4.6 V |
| C. | 1.6 V |
| D. | 11 V |
| Answer» B. 4.6 V | |
| 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? |
| 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°. |
| Answer» B. Wave A lags wave B by 15°. | |
| 6. |
A phasor represents |
| A. | the magnitude and a quantity direction |
| B. | the width of a quantity |
| C. | the phase angle |
| D. | the magnitude of a quantity |
| Answer» B. the width of a quantity | |
| 7. |
A sawtooth wave has a period of 10 ms. Its frequency is |
| A. | 10 Hz |
| B. | 50 Hz |
| C. | 100 Hz |
| D. | 1,000 Hz |
| Answer» D. 1,000 Hz | |
| 8. |
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 |
| Answer» E. | |
| 9. |
A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is |
| A. | 45.12 mA |
| B. | 16 mA |
| C. | 39.6 mA |
| D. | 22.6 mA |
| Answer» D. 22.6 mA | |
| 10. |
A 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycle |
| A. | is 1% |
| B. | is 30% |
| C. | is 100% |
| D. | cannot be determined |
| Answer» C. is 100% | |
| 11. |
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% |
| Answer» B. 50% | |
| 12. |
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 |
| Answer» D. none of the above | |