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- Question
If a voltmeter measures a sine wave as 500 mV, what would be its average value?
Options- A. 159.0 mV
- B. 318.5 mV
- C. 353.5 mV
- D. 451.0 mV
- Correct Answer
- 451.0 mV
ExplanationSome AC Voltage Conversion:
Peak to rms: multiply peak by 0.707.
Peak to average: multiply peak by 0.637.
Rms to peak: multiply rms by 1.414.
Rms to average: multiply rms by 0.9.
Average to rms: multiply avg by 1.111.
Average to peak: multiply avg by 1.567.
Mostly voltmeter shows rms value. So, Vav = 0.9*Vrms
= 0.9*500.
= 450mV ~ [D] 451 mV.
Alternating Current vs Direct Current problems
Search Results
- 1. What is the peak-to-peak current value when an ammeter measures a 20 mA value?
Options- A. 14 mA
- B. 28 mA
- C. 40 mA
- D. 57 mA Discuss
Correct Answer: 57 mA
- 2. Which control should be moved to display more cycles of a signal on an oscilloscope?
Options- A. horizontal position to left or right
- B. volts/cm to a smaller number
- C. vertical position to top or bottom
- D. time/cm to a higher setting Discuss
Correct Answer: time/cm to a higher setting
- 3. If a waveform period is determined to be 10 microseconds in duration, what is the frequency of the signal?
Options- A. 100 Hz
- B. 1000 Hz
- C. 10 kHz
- D. 100 kHz Discuss
Correct Answer: 100 kHz
- 4. A rectangular wave that has a duty cycle of 50 percent could be called a:
Options- A. c wave
- B. sawtooth wave
- C. square wave
- D. triangle wave Discuss
Correct Answer: square wave
- 5. Why is ac current transfer more effective than dc current transfer over long distances?
Options- A. due to the height of power lines
- B. due to the use of ac generators
- C. due to step-up and step-down transformers reducing I2R losses
- D. due to very high voltages Discuss
Correct Answer: due to step-up and step-down transformers reducing I2R losses
- 6. AC effective voltage is named:
Options- A. average
- B. peak
- C. peak-to-peak
- D. root mean square Discuss
Correct Answer: root mean square
- 7. What is the name of a device that converts sound waves to electrical waves?
Options- A. an amplifier
- B. an antenna
- C. a filter
- D. a microphone Discuss
Correct Answer: a microphone
- 8. What is the average value of a 12 V peak wave?
Options- A. 3.82 V
- B. 4.24 V
- C. 7.64 V
- D. 9.42 V Discuss
Correct Answer: 7.64 V
- 9. If the frequency of a radio wave is increased, then its wavelength will:
Options- A. increase
- B. decrease
- C. remain the same
- D. cannot tell Discuss
Correct Answer: decrease
- 10. A triangle wave consists of repeating:
Options- A. positive ramps only
- B. negative ramps only
- C. positive and negative ramps of equal value
- D. positive and negative ramps of unequal value Discuss
Correct Answer: positive and negative ramps of equal value
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