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MCQs

Total Questions : 199 | Page 8 of 20 pages
Question 71. The time axis of an AC phasor represents?
  1.    Time
  2.    Phase angle
  3.    Voltage
  4.    Current
 Discuss Question
Answer: Option B. -> Phase angle
Answer: (b).Phase angle
Question 72. A phasor has frozen at 30 degrees, find the value of the phase angle.
  1.    30 degrees
  2.    60 degrees
  3.    120 degrees
  4.    180 degrees
 Discuss Question
Answer: Option A. -> 30 degrees
Answer: (a).30 degrees
Question 73. The resultant of two alternating sinusoidal voltages or currents can be found using ___________
  1.    Triangular law
  2.    Parallelogram law
  3.    Either triangular or parallelogram law
  4.    Neither triangular nor parallelogram law
 Discuss Question
Answer: Option B. -> Parallelogram law
Answer: (b).Parallelogram law
Question 74. Calculate the crest factor if the peak value of current is 10A and the rms value is 2A.
  1.    5
  2.    10
  3.    5A
  4.    10A
 Discuss Question
Answer: Option A. -> 5
Answer: (a).5
Question 75. If Im is the maximum value of a sinusoidal voltage, what is the instantaneous value?
  1.    i=Im/2
  2.    i=Imsinθ
  3.    i=Imcosθ
  4.    i=Imsinθ or i=Imcosθ
 Discuss Question
Answer: Option D. -> i=Imsinθ or i=Imcosθ
Answer: (d).i=Imsinθ or i=Imcosθ
Question 76. If maximum value of current is 5√2 A, what will be the value of RMS current?
  1.    10 A
  2.    5 A
  3.    15 A
  4.    25 A
 Discuss Question
Answer: Option B. -> 5 A
Answer: (b).5 A
Question 77. Average value of current over a half cycle is?
  1.    0.67Im
  2.    0.33Im
  3.    6.7Im
  4.    3.3Im
 Discuss Question
Answer: Option A. -> 0.67Im
Answer: (a).0.67Im
Question 78. What is the correct expression for the rms value of current?
  1.    Irms=Im/2
  2.    Irms=Im/√2
  3.    Irms=Im/4
  4.    Irms=Im
 Discuss Question
Answer: Option B. -> Irms=Im/√2
Answer: (b).Irms=Im/√2
Question 79. The length of the phasor represents?
  1.    Magnitude of the quantity
  2.    Direction of the quantity
  3.    Neither magnitude nor direction
  4.    Either magnitude or direction
 Discuss Question
Answer: Option A. -> Magnitude of the quantity
Answer: (a).Magnitude of the quantity
Question 80. Ammeters and voltmeters are calibrated to read?
  1.    RMS value
  2.    Peak value
  3.    Average value
  4.    Instantaneous value
 Discuss Question
Answer: Option A. -> RMS value
Answer: (a).RMS value

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