Alternating Current And Voltage MCQ

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• A 20 kHz pulse waveform consists of pulses that are 15 µs wide. The duty cycle
  ক

  Is 1%

  খ

  Is 30%

  গ

  Is 100%

  ঘ

  Cannot be determined
• Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.
  ক

  True

  খ

  False
• 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
  ক

  0°

  খ

  45°

  গ

  40°

  ঘ

  None of the above
• The length of a phasor represents the amplitude.
  ক

  True

  খ

  False
• A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is
  ক

  25%

  খ

  50%

  গ

  1%

  ঘ

  100%
• If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is
  ক

  4 V

  খ

  18.8 V

  গ

  26.6 V

  ঘ

  2.66 V
• If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is
  ক

  5.44 V

  খ

  54.4 V

  গ

  7.07 V

  ঘ

  8 V
• How many degrees are there in p/3 rad?
  ক

  6°

  খ

  60°

  গ

  180°

  ঘ

  27°
• The unit of frequency is the hertz.
  ক

  True

  খ

  False
• The angular position of a phasor represents the angle of the sine wave with respect to a reference.
  ক

  True

  খ

  False
• If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is
  ক

  15 mA

  খ

  1.5 mA

  গ

  10 mA

  ঘ

  1 mA
• The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.
  ক

  True

  খ

  False
• The average value of a 12 V peak sine wave over one complete cycle is
  ক

  0 V

  খ

  1.27 V

  গ

  7.64 V

  ঘ

  6.37 V
• A saw-tooth wave has a period of 10 ms. Its frequency is
  ক

  10 Hz

  খ

  50 Hz

  গ

  100 Hz

  ঘ

  1,000 Hz
• The designation rms means repetitions measured per second.
  ক

  True

  খ

  False
• Periodic is characterized by a repetition at fixed time intervals.
  ক

  True

  খ

  False
• A square wave has a period of 60 µs. The first odd harmonic is
  ক

  5 kHz

  খ

  50 kHz

  গ

  500 kHz

  ঘ

  33.33 kHz
• Average value of a sine wave is 0.707 times the peak value.
  ক

  True

  খ

  False
• A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is
  ক

  6 V

  খ

  30 V

  গ

  35 V

  ঘ

  0 V
• The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is
  ক

  40 Hz

  খ

  100 Hz

  গ

  400 Hz

  ঘ

  Indeterminable
• If the peak of a sine wave is 13 V, the peak-to-peak value is
  ক

  6.5 V

  খ

  13 V

  গ

  26 V

  ঘ

  None of the above
• A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is
  ক

  45.12 mA

  খ

  16 mA

  গ

  39.6 mA

  ঘ

  22.6 mA
• A signal with a 400 µs period has a frequency of
  ক

  250 Hz

  খ

  2,500 Hz

  গ

  25,000 Hz

  ঘ

  400 Hz
• The instantaneous value is the voltage or current value of a waveform at its peak.
  ক

  True

  খ

  False
• A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of
  ক

  0.0045 s

  খ

  2 ms

  গ

  1.5 ms

  ঘ

  3,000 µs
• A 1 kHz signal has a period of 1 ms.
  ক

  True

  খ

  False
• Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is
  ক

  16.54 V

  খ

  1.65 V

  গ

  10.60 V

  ঘ

  5.93 V
• A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is
  ক

  4 V

  খ

  4.6 V

  গ

  1.6 V

  ঘ

  11 V
• A phasor represents
  ক

  The magnitude and a quantity direction

  খ

  The width of a quantity

  গ

  The phase angle

  ঘ

  The magnitude of a quantity
• If a sine wave goes through 10 cycles in 20 µs, the period is
  ক

  20 µs

  খ

  4 µs

  গ

  2 µs

  ঘ

  100 µs