Discussion
Home ‣ Electronics ‣ Alternating Current vs Direct Current Comments
- Question
If a sine wave signal is 100 mV peak-to-peak, how many volts would be measured by a voltmeter?
Options- A. 14.14 mV
- B. 35.4 mV
- C. 63.7 mV
- D. 70.7 mV
- Correct Answer
- 35.4 mV
- 1. Power companies supply ac, not dc, because:
Options- A. it is easier to transmit ac
- B. there is no longer a need for dc
- C. dc is more dangerous
- D. there are not enough batteries Discuss
- 2. If current varies periodically from zero to a maximum, back to zero, and then repeats, the signal is:
Options- A. direct
- B. alternating
- C. pulsating
- D. repetitive Discuss
- 3. Signal comparisons may be most easily seen when using which item of test equipment?
Options- A. spectrum analyzer
- B. multimeter
- C. function generator
- D. dual trace oscilloscope Discuss
- 4. What is the rms voltage value of an ac signal whose peak oscilloscope display uses 3 major divisions above the zero setting? (V/cm = 5)
Options- A. 5.3 V
- B. 10.6 V
- C. 15.0 V
- D. 21.2 V Discuss
- 5. Test equipment selection enables the technician to both generate signals and:
Options- A. change circuit conditions
- B. inject signals
- C. sense circuit conditions
- D. change signal frequencies Discuss
- 6. One oscilloscope selector knob that allows the major and minor divisions of the graticule to be used to determine a signal amplitude value is called the:
Options- A. time/cm control
- B. position control
- C. intensity control
- D. volts/cm control Discuss
- 7. What is the name of a device used to directly measure the frequency of a periodic wave?
Options- A. oscilloscope
- B. frequency meter or counter
- C. audio frequency generator
- D. radio frequency generator Discuss
- 8. A test equipment item that has the ability to produce either square, triangular, or sawtooth waveforms is called:
Options- A. a function generator
- B. a radio frequency generator
- C. an audio frequency generator
- D. a frequency meter or counter Discuss
- 9. The distance that a signal's energy can travel in the time it takes for one cycle to occur is called the signal's:
Options- A. amplitude
- B. frequency
- C. wavelength
- D. period Discuss
- 10. 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
Alternating Current vs Direct Current problems
Search Results
Correct Answer: it is easier to transmit ac
Correct Answer: pulsating
Correct Answer: dual trace oscilloscope
Correct Answer: 10.6 V
Correct Answer: sense circuit conditions
Correct Answer: volts/cm control
Correct Answer: frequency meter or counter
Correct Answer: a function generator
Correct Answer: wavelength
Correct Answer: due to step-up and step-down transformers reducing I2R losses
Comments
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