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MCQs

Total Questions : 199 | Page 6 of 20 pages
Question 51. The variation of a quantity such as voltage or current shown on a graph is known as ___________
  1.    Waveform
  2.    Peak value
  3.    Instantaneous value
  4.    Period
 Discuss Question
Answer: Option A. -> Waveform
Answer: (a).Waveform
Question 52. The repetition of a variable quantity, recurring at equal intervals, is known as ___________
  1.    Waveform
  2.    Instantaneous value
  3.    Cycle
  4.    Period
 Discuss Question
Answer: Option C. -> Cycle
Answer: (c).Cycle
Question 53. If the peak voltage is 9V, calculate the peak to peak voltage.
  1.    9V
  2.    20V
  3.    18V
  4.    12V
 Discuss Question
Answer: Option C. -> 18V
Answer: (c).18V
Question 54. What will happen to the frequency if the number of revolutions increases?
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Becomes zero
 Discuss Question
Answer: Option A. -> Increases
Answer: (a).Increases
Question 55. Which is the correct formula for frequency in an ac generator?
  1.    f=p*n
  2.    f=p/n
  3.    f=n/p
  4.    f=n²p
 Discuss Question
Answer: Option A. -> f=p*n
Answer: (a).f=p*n
Question 56. The waveform of the emf generated undergoes one complete cycle when?
  1.    Conductors move past north pole
  2.    Conductors move past south pole
  3.    Conductors move past north and south poles
  4.    Conductors are stationary
 Discuss Question
Answer: Option C. -> Conductors move past north and south poles
Answer: (c).Conductors move past north and south poles
Question 57. When is the shape of the negative half of the emf waveform equal to the positive half?
  1.    When the conductors move past north pole
  2.    When conductors move past south pole
  3.    When conductors move past both north and south pole
  4.    When conductors are stationary
 Discuss Question
Answer: Option C. -> When conductors move past both north and south pole
Answer: (c).When conductors move past both north and south pole
Question 58. __________ current is found by dividing the area enclosed by the half cycle by the length of the base of the half cycle.
  1.    RMS current
  2.    Average current
  3.    Instantaneous current
  4.    Total current
 Discuss Question
Answer: Option B. -> Average current
Answer: (b).Average current
Question 59. What is the effective value of current?
  1.    RMS current
  2.    Average current
  3.    Instantaneous current
  4.    Total current
 Discuss Question
Answer: Option A. -> RMS current
Answer: (a).RMS current
Question 60. Peak value divided by the rms value gives us?
  1.    Peak factor
  2.    Crest factor
  3.    Both peak and crest factor
  4.    Neither peak nor crest factor
 Discuss Question
Answer: Option C. -> Both peak and crest factor
Answer: (c).Both peak and crest factor

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