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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 38 of 39 pages
Question 371. 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
  1.    16.54 V
  2.    1.65 V
  3.    10.60 V
  4.    5.93 V
 Discuss Question
Answer: Option A. -> 16.54 V
Question 372. Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?
  1.    Wave A lags wave B by 105°.
  2.    Wave A leads wave B by 15°.
  3.    Wave A leads wave B by 105°.
  4.    Wave A lags wave B by 15°.
 Discuss Question
Answer: Option B. -> Wave A leads wave B by 15°.
Question 373. If a sine wave goes through 10 cycles in 20 s, the period is
  1.    100 s
  2.    20 s
  3.    2 s
  4.    4 s
 Discuss Question
Answer: Option C. -> 2 s
Question 374. A square wave has a period of 60 s. The first odd harmonic is
  1.    500 kHz
  2.    50 kHz
  3.    5 kHz
  4.    33.33 kHz
 Discuss Question
Answer: Option B. -> 50 kHz
Question 375. A phasor represents
  1.    the width of a quantity
  2.    the phase angle
  3.    the magnitude and a quantity direction
  4.    the magnitude of a quantity
 Discuss Question
Answer: Option C. -> the magnitude and a quantity direction
Question 376. A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of
  1.    1.5 ms
  2.    0.0045 s
  3.    3,000 s
  4.    2 ms
 Discuss Question
Answer: Option B. -> 0.0045 s
Question 377. A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is
  1.    1.6 V
  2.    4 V
  3.    4.6 V
  4.    11 V
 Discuss Question
Answer: Option B. -> 4 V
Question 378. If the rms current through a 6.8 k resistor is 8 mA, the rms voltage drop across the resistor is
  1.    54.4 V
  2.    8 V
  3.    7.07 V
  4.    5.44 V
 Discuss Question
Answer: Option A. -> 54.4 V
Question 379. The average half-cycle value of a sine wave with a 40 V peak is
  1.    25.48 V
  2.    14.14 V
  3.    50.96 V
  4.    6.37 V
 Discuss Question
Answer: Option A. -> 25.48 V
Question 380. 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.    0 V
  3.    30 V
  4.    35 V
 Discuss Question
Answer: Option D. -> 35 V

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