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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 7 of 39 pages
Question 61. A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of
  1.    0.0045 s
  2.    2 ms
  3.    1.5 ms
  4.    3,000 µs
 Discuss Question
Answer: Option A. -> 0.0045 s
Question 62. The instantaneous value is the voltage or current value of a waveform at its peak.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 63. A signal with a 400 µs period has a frequency of
  1.    250 Hz
  2.    2,500 Hz
  3.    25,000 Hz
  4.    400 Hz
 Discuss Question
Answer: Option B. -> 2,500 Hz
Question 64. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is
  1.    45.12 mA
  2.    16 mA
  3.    39.6 mA
  4.    22.6 mA
 Discuss Question
Answer: Option C. -> 39.6 mA
Question 65. If the peak of a sine wave is 13 V, the peak-to-peak value is
  1.    6.5 V
  2.    13 V
  3.    26 V
  4.    None of the above
 Discuss Question
Answer: Option C. -> 26 V
Question 66. 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
  1.    40 Hz
  2.    100 Hz
  3.    400 Hz
  4.    Indeterminable
 Discuss Question
Answer: Option C. -> 400 Hz
Question 67. 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
  1.    6 V
  2.    30 V
  3.    35 V
  4.    0 V
 Discuss Question
Answer: Option C. -> 35 V
Question 68. Average value of a sine wave is 0.707 times the peak value.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 69. A square wave has a period of 60 µs. The first odd harmonic is
  1.    5 kHz
  2.    50 kHz
  3.    500 kHz
  4.    33.33 kHz
 Discuss Question
Answer: Option B. -> 50 kHz
Question 70. The designation rms means repetitions measured per second.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False

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