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MCQs

Total Questions : 49 | Page 1 of 5 pages
Question 1.  Non-sinusoidal waveforms are made of
  1.    different sinusoidal waveforms
  2.    fundamental and even harmonics
  3.    fundamental and odd harmonics
  4.    even and odd harmonics only
 Discuss Question
Answer: Option A. -> different sinusoidal waveforms
Question 2.  In a 3-phase system,the harmonic has negative phase sequence of RBY.
  1.    9
  2.    13
  3.    5
  4.    15
 Discuss Question
Answer: Option C. -> 5
Question 3.  The trigonometric Fourier series for a complex wave will contain positive cosine terms only when
  1.    it contains even harmonics
  2.    its two half-cycles are symmetrical
  3.    its value is zero at 0= n/2, 3n/2 etc.
  4.    its value is zero at 0= n, 2n etc.
 Discuss Question
Answer: Option C. -> its value is zero at 0= n/2, 3n/2 etc.
Question 4.  The positive and negative halves of a complex wave are symmetrical when
  1.    it contains even harmonics
  2.    phase difference between even harmonics and fundamentals is 0 or it
  3.    it contains odd harmonics
  4.    phase difference between even harmonics and fundamental is either n/2 or 3n/2
 Discuss Question
Answer: Option C. -> it contains odd harmonics
Question 5.  Two complex waves will have the same wave-shape if
  1.    they contain the same harmonics
  2.    ratio of corresponding harmonics to their respective fundamentals is the same
  3.    harmonics are similarly spaced with respect to their fundamental
  4.    they have all of the above
 Discuss Question
Answer: Option D. -> they have all of the above
Question 6.  The rms value of the complex voltage given by v = 161i sin cot + 12 Ari sin Rot is
  1.    20 Ari
  2.    20
  3.    28
  4.    192
 Discuss Question
Answer: Option B. -> 20
Question 7.  Tansient disturbance is produced in a circuit whenever
  1.    it is suddenly connected or discon nected from the supply
  2.    it is shorted
  3.    its applied voltage is changed suddenly
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 8.  Transient current in electrical circuits are associated with
  1.    inductors
  2.    capacitors
  3.    resistors
  4.    both (a) and (b)
 Discuss Question
Answer: Option D. -> both (a) and (b)
Question 9.  There are no transients in pure resistive circuits because they
  1.    offer high resistance
  2.    obey Ohm's law
  3.    have no stored energy
  4.    are linear circuits
 Discuss Question
Answer: Option C. -> have no stored energy
Question 10. .  The transient current in a loss-free L-C circuit when excited from an ac source is a/an sine wave.
  1.    over-damped
  2.    undamped
  3.    under-damped
  4.    critically damped
 Discuss Question
Answer: Option B. -> undamped

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