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MCQs

Total Questions : 199 | Page 3 of 20 pages
Question 21. The angular position of a phasor represents the angle of the sine wave with respect to a reference.
  1.     True
  2.     False
  3.     10 mA
  4.     1 mA
 Discuss Question
Answer: Option A. ->  True
Question 22. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. the duty cycle is
  1.     25%
  2.     50%
  3.     1%
  4.     100%
 Discuss Question
Answer: Option A. ->  25%
Question 23. The length of a phasor represents the amplitude.
  1.     True
  2.     False
  3.     1%
  4.     100%
 Discuss Question
Answer: Option A. ->  True
Question 24. If the rms current through a 4.7 kΩ resistor is 4 ma, the peak voltage drop across the resistor is
  1.     4 V
  2.     18.8 V
  3.     26.6 V
  4.     2.66 V
 Discuss Question
Answer: Option C. ->  26.6 V
Question 25. A 20 khz pulse waveform consists of pulses that are 15 µs wide. the duty cycle
  1.     Is 1%
  2.     Is 30%
  3.     Is 100%
  4.     Cannot be determined
 Discuss Question
Answer: Option B. ->  Is 30%
Question 26. Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.
  1.     True
  2.     False
 Discuss Question
Answer: Option B. ->  False
Question 27. To produce an 800 hz sine wave, a four-pole generator must be operated at
  1.     200 rps
  2.     400 rps
  3.     800 rps
  4.     1,600 rps
 Discuss Question
Answer: Option B. ->  400 rps
Question 28. Amplitude is the maximum value of a voltage or current.
  1.     True
  2.     False
  3.     Wave A leads wave B by 105°
  4.     Wave A lags wave B by 105°
 Discuss Question
Answer: Option A. ->  True
Question 29. A phasor represents
  1.     The magnitude and a quantity direction
  2.     The width of a quantity
  3.     The phase angle
  4.     The magnitude of a quantity
 Discuss Question
Answer: Option A. ->  The magnitude and a quantity direction
Question 30. If a sine wave goes through 10 cycles in 20 µs, the period is
  1.     20 µs
  2.     4 µs
  3.     2 µs
  4.     100 µs
 Discuss Question
Answer: Option C. ->  2 µs

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