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MCQs

Total Questions : 199 | Page 5 of 20 pages
Question 41. What should theta be in order to get maximum emf?
  1.    0°
  2.    90°
  3.    180°
  4.    45°
 Discuss Question
Answer: Option B. -> 90°
Answer: (b).90°
Question 42. Emf is zero if the angle between velocity and length is _____
  1.    0°
  2.    90°
  3.    270°
  4.    45°
 Discuss Question
Answer: Option A. -> 0°
Answer: (a).0°
Question 43. Usually phasor diagrams are drawn representing?
  1.    RMS value
  2.    Peak value
  3.    Average value
  4.    Instantaneous value
 Discuss Question
Answer: Option A. -> RMS value
Answer: (a).RMS value
Question 44. The instantaneous values of two alternating voltages are given as:
v1=60sinθ and v2=40sin(θ − π/3).
Find the instantaneous difference.
  1.    53 sin(71.5°) V
  2.    53 sin( 79..5°) V
  3.    53 sin(26.5°) V
  4.    53 cos(36.5°) V
 Discuss Question
Answer: Option B. -> 53 sin( 79..5°) V
Answer: (b).53 sin( 79..5°) V
Question 45. If two current phasors, having magnitude 12A and 5A intersect at an angle of 90 degrees, calculate the resultant current.
  1.    13 A
  2.    10 A
  3.    6 A
  4.    5 A
 Discuss Question
Answer: Option A. -> 13 A
Answer: (a).13 A
Question 46. If two current phasors, having magnitude 5A and 10A intersect at an angle of 60 degrees, calculate the resultant current.
  1.    12.23 A
  2.    12.54 A
  3.    13.23 A
  4.    14.24 A
 Discuss Question
Answer: Option C. -> 13.23 A
Answer: (c).13.23 A
Question 47. The instantaneous values of two alternating voltages are given as:
v1=60sinθ and v2=40sin(θ − π/3).
Find the instantaneous sum.
  1.    87.2 sin(36.5°) V
  2.    87.2 sin( 0.5°) V
  3.    87.2 sin(26.5°) V
  4.    87.2 cos(36.5°) V
 Discuss Question
Answer: Option A. -> 87.2 sin(36.5°) V
Answer: (a).87.2 sin(36.5°) V
Question 48. In an A.C. generator, increase in number of turns in the coil _________
  1.    Increases emf
  2.    Decreases emf
  3.    Makes the emf zero
  4.    Maintains the emf at a constant value
 Discuss Question
Answer: Option A. -> Increases emf
Answer: (a).Increases emf
Question 49. The number of cycles that occur in one second is termed as ___________
  1.    Waveform
  2.    Frequency
  3.    Amplitude
  4.    Period
 Discuss Question
Answer: Option B. -> Frequency
Answer: (b).Frequency
Question 50. What is the duration of one cycle known as _________
  1.    Waveform
  2.    Peak value
  3.    Instantaneous value
  4.    Period
 Discuss Question
Answer: Option D. -> Period
Answer: (d).Period

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