MCQOPTIONS
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MCQOPTIONS
This section includes 54 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The period of a 10 kHz sine wave is 10 s. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The duty cycle of a square wave with a pulse width of 3 s and a period of 9 s is 40%. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
What is the peak-to peak voltage of a 56 V ac voltage? |
| A. | 158 V |
| B. | 164 V |
| C. | 82 V |
| D. | 79 V |
| Answer» B. 164 V | |
| 4. |
The average value of a sine wave is .707 times the peak value. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 5. |
The period of a 10 kHz sine wave is 10 s. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 6. |
A sawtooth voltage waveform has a linear ramp that changes voltage level with respect to time. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 7. |
Which control should be moved to display more cycles of a signal on an oscilloscope? |
| 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 |
| Answer» E. | |
| 8. |
What is the waveform period difference between the 60 Hz electricity used in this country and the 50 Hz used in Europe? |
| A. | 3 ms |
| B. | 16 ms |
| C. | 4 ms |
| D. | 20 ms |
| Answer» B. 16 ms | |
| 9. |
A sine wave reaches maximum positive voltage at: |
| A. | 90° |
| B. | 0° |
| C. | –90° |
| D. | 360° |
| Answer» B. 0¬∞ | |
| 10. |
What is the peak-to-peak current value when an ammeter measures a 20 mA value? |
| A. | 14 mA |
| B. | 28 mA |
| C. | 40 mA |
| D. | 57 mA |
| Answer» E. | |
| 11. |
The current is flowing in what direction? |
| A. | clockwise |
| B. | counterclockwise |
| C. | in both directions at the same time |
| D. | 50% of the time clockwise and 50% of the time counterclockwise |
| Answer» E. | |
| 12. |
Test equipment selection enables the technician to both generate signals and: |
| A. | change circuit conditions |
| B. | inject signals |
| C. | sense circuit conditions |
| D. | change signal frequencies |
| Answer» D. change signal frequencies | |
| 13. |
An ac wave shape could be a sine wave, square wave, or sawtooth wave. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 14. |
What is the peak-to peak voltage of a 56 Vrms ac voltage? |
| A. | 158 V |
| B. | 164 V |
| C. | 82 V |
| D. | 79 V |
| Answer» B. 164 V | |
| 15. |
DC current transfers better over longer distances than ac current. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 16. |
Signal comparisons may be most easily seen when using which item of test equipment? |
| A. | spectrum analyzer |
| B. | multimeter |
| C. | function generator |
| D. | dual trace oscilloscope |
| Answer» E. | |
| 17. |
How long would it take to transmit an electromagnetic wave to a receiving antenna 1,000 miles away? |
| A. | 5.38 ms |
| B. | 10.8 ms |
| C. | 53.8 ms |
| D. | 108 ms |
| Answer» B. 10.8 ms | |
| 18. |
The __________ is defined as the ratio of a pulse width (positive or negative pulse or cycle) to the overall period of time of the wave. |
| A. | pulse width |
| B. | duty cycle |
| C. | phase shift |
| D. | active ratio |
| Answer» C. phase shift | |
| 19. |
If a waveform period is determined to be 10 microseconds in duration, what is the frequency of the signal? |
| A. | 100 Hz |
| B. | 1000 Hz |
| C. | 10 kHz |
| D. | 100 kHz |
| Answer» E. | |
| 20. |
A triangle wave consists of repeating: |
| A. | positive ramps only |
| B. | negative ramps only |
| C. | positive and negative ramps of equal value |
| D. | positive and negative ramps of unequal value |
| Answer» D. positive and negative ramps of unequal value | |
| 21. |
The magnitude that an alternation varies from zero is called its: |
| A. | altitude |
| B. | amplitude |
| C. | attitude |
| D. | polarity |
| Answer» C. attitude | |
| 22. |
One oscilloscope selector knob that allows the major and minor divisions of the graticule to be used to determine a waveform period is called a: |
| A. | focus control |
| B. | time/cm control |
| C. | intensity control |
| D. | volts/cm control |
| Answer» C. intensity control | |
| 23. |
If a voltmeter measures a sine wave as 500 mV, what would be its average value? |
| A. | 159.0 mV |
| B. | 318.5 mV |
| C. | 353.5 mV |
| D. | 451.0 mV |
| Answer» E. | |
| 24. |
What does the CRT oscilloscope display? |
| A. | voltage and period |
| B. | current and frequency |
| C. | rms voltage and current |
| D. | frequency and voltage |
| Answer» B. current and frequency | |
| 25. |
A rectangular wave that has a duty cycle of 50 percent could be called a: |
| A. | c wave |
| B. | sawtooth wave |
| C. | square wave |
| D. | triangle wave |
| Answer» D. triangle wave | |
| 26. |
The phase difference between sine waves of different frequencies is: |
| A. | equal to their frequency differences |
| B. | the difference in their fixed time displacement |
| C. | the same throughout time |
| D. | constantly changing |
| Answer» C. the same throughout time | |
| 27. |
The duty cycle of a square wave with a pulse width of 3 s and a period of 9 s is 40%. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 28. |
A test equipment item that has the ability to produce either square, triangular, or sawtooth waveforms is called: |
| A. | a function generator |
| B. | a radio frequency generator |
| C. | an audio frequency generator |
| D. | a frequency meter or counter |
| Answer» B. a radio frequency generator | |
| 29. |
What term expresses the frequency of a rectangular wave? |
| A. | Hz |
| B. | period |
| C. | PRF |
| D. | PRT |
| Answer» D. PRT | |
| 30. |
A square and a rectangular waveform appear to have a step voltage transition. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 31. |
If a sine wave signal is 100 mV peak-to-peak, how many volts would be measured by a voltmeter? |
| A. | 14.14 mV |
| B. | 35.4 mV |
| C. | 63.7 mV |
| D. | 70.7 mV |
| Answer» C. 63.7 mV | |
| 32. |
The rms value of a sine wave is .707 x peak-to-peak value/2. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 33. |
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) |
| A. | 5.3 V |
| B. | 10.6 V |
| C. | 15.0 V |
| D. | 21.2 V |
| Answer» C. 15.0 V | |
| 34. |
If the frequency of a radio wave is increased, then its wavelength will: |
| A. | increase |
| B. | decrease |
| C. | remain the same |
| D. | cannot tell |
| Answer» C. remain the same | |
| 35. |
A sine wave has: |
| A. | four quadrants |
| B. | two alternations |
| C. | one period |
| D. | all of the above |
| Answer» E. | |
| 36. |
Why is ac current transfer more effective than dc current transfer over long distances? |
| 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 |
| Answer» D. due to very high voltages | |
| 37. |
What is the name of a device used to directly measure the frequency of a periodic wave? |
| A. | oscilloscope |
| B. | frequency meter or counter |
| C. | audio frequency generator |
| D. | radio frequency generator |
| Answer» C. audio frequency generator | |
| 38. |
One adjustable knob on the oscilloscope that allows the trace to be aligned with a reference graticule is called the: |
| A. | position control |
| B. | focus control |
| C. | intensity control |
| D. | volts/cm control |
| Answer» B. focus control | |
| 39. |
What is the average value of a 12 V peak wave? |
| A. | 3.82 V |
| B. | 4.24 V |
| C. | 7.64 V |
| D. | 9.42 V |
| Answer» D. 9.42 V | |
| 40. |
What is the period of a 16 MHz sine wave? |
| A. | 196 ns |
| B. | 62.5 ns |
| C. | 31.25 ns |
| D. | 19.9 ns |
| Answer» C. 31.25 ns | |
| 41. |
The letter in the Greek alphabet used to represent wavelength is __________. |
| A. | lambda |
| B. | theta |
| C. | omega |
| D. | delta |
| Answer» B. theta | |
| 42. |
Power companies supply ac, not dc, because: |
| 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 |
| Answer» B. there is no longer a need for dc | |
| 43. |
What is the waveform period of a square wave signal that horizontally covers 3 major divisions per cycle? (time/cm = 50 ms) |
| A. | 50 ms |
| B. | 100 ms |
| C. | 150 ms |
| D. | 200 ms |
| Answer» D. 200 ms | |
| 44. |
If current varies periodically from zero to a maximum, back to zero, and then repeats, the signal is: |
| A. | direct |
| B. | alternating |
| C. | pulsating |
| D. | repetitive |
| Answer» D. repetitive | |
| 45. |
The distance that a signal's energy can travel in the time it takes for one cycle to occur is called the signal's: |
| A. | amplitude |
| B. | frequency |
| C. | wavelength |
| D. | period |
| Answer» D. period | |
| 46. |
Which percentages of full-amplitude rise time are used for a pulse wave? |
| A. | 0 to 50 percent |
| B. | 0 to 100 percent |
| C. | 5 to 95 percent |
| D. | 10 to 90 percent |
| Answer» E. | |
| 47. |
DC current flows in one direction, while ac current rises from zero to a maximum, then falls to zero in one direction, then rises to a maximum, then falls to zero in the opposite direction. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 48. |
What is the name of a device that converts sound waves to electrical waves? |
| A. | an amplifier |
| B. | an antenna |
| C. | a filter |
| D. | a microphone |
| Answer» E. | |
| 49. |
What is the peak value of a household appliance that uses a 230 V ac source? |
| A. | 163 V |
| B. | 230 V |
| C. | 325 V |
| D. | 480 V |
| Answer» D. 480 V | |
| 50. |
The power that is distributed from a power plant to your home is: |
| A. | high voltage to high voltage |
| B. | low voltage to high voltage |
| C. | high voltage to low voltage |
| D. | low voltage to low voltage |
| Answer» D. low voltage to low voltage | |