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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 8 of 39 pages
Question 71. Periodic is characterized by a repetition at fixed time intervals.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 72. A saw-tooth wave has a period of 10 ms. Its frequency is
  1.    10 Hz
  2.    50 Hz
  3.    100 Hz
  4.    1,000 Hz
 Discuss Question
Answer: Option C. -> 100 Hz
Question 73. The average value of a 12 V peak sine wave over one complete cycle is
  1.    0 V
  2.    1.27 V
  3.    7.64 V
  4.    6.37 V
 Discuss Question
Answer: Option A. -> 0 V
Question 74. The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 75. If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is
  1.    15 mA
  2.    1.5 mA
  3.    10 mA
  4.    1 mA
 Discuss Question
Answer: Option B. -> 1.5 mA
Question 76. The angular position of a phasor represents the angle of the sine wave with respect to a reference.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 77. How many degrees are there in p/3 rad?
  1.    6°
  2.    60°
  3.    180°
  4.    27°
 Discuss Question
Answer: Option B. -> 60°
Question 78. The unit of frequency is the hertz.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 79. If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is
  1.    5.44 V
  2.    54.4 V
  3.    7.07 V
  4.    8 V
 Discuss Question
Answer: Option B. -> 54.4 V
Question 80. 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

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