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MCQs

Total Questions : 327 | Page 4 of 33 pages
Question 31. Pure inductive circuit takes power from the a.c. line when
  1.     Applied voltage decreases but current increases
  2.     Applied voltage increases but current decreases
  3.     Both applied voltage and current increase
  4.     Both applied voltage and current decrease
 Discuss Question
Answer: Option A. ->  Applied voltage decreases but current increases
Question 32. Time constant of a circuit is the time in seconds taken after the application of voltage to each
  1.     25% of maximum value
  2.     50% of maximum value
  3.     63% of maximum value
  4.     90% of the maximum value
 Discuss Question
Answer: Option C. ->  63% of maximum value
Question 33. Two waves of the same frequency have opposite phase when the phase angle between them is
  1.     360°
  2.     180°
  3.     90°
  4.     0°
 Discuss Question
Answer: Option B. ->  180°
Question 34. The r.m.s. value of a sinusoidal a.c. current is equal to its value at an angle of ________ degrees.
  1.     90
  2.     60
  3.     45
  4.     30
 Discuss Question
Answer: Option C. ->  45
Question 35. When an alternating current passes through an ohmic resistance the electrical power converted into heat is
  1.     Apparent power
  2.     True power
  3.     Reactive power
  4.     None of the above
 Discuss Question
Answer: Option B. ->  True power
Question 36. The purpose of a parallel circuit resonance is to magnify
  1.     Current
  2.     Voltage
  3.     Power
  4.     Frequency
 Discuss Question
Answer: Option B. ->  Voltage
Question 37. The safest value of current the human body can carry for more than 3 second is
  1.     4 mA
  2.     9 mA
  3.     15 mA
  4.     25 mA
 Discuss Question
Answer: Option B. ->  9 mA
Question 38. An a.c. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,
  1.     The current through the resistance is more
  2.     The current through the resistance is less
  3.     Both resistance and inductance carry equal currents
  4.     None of the above
 Discuss Question
Answer: Option C. ->  Both resistance and inductance carry equal currents
Question 39. The frequency of domestic power supply in india is
  1.     200 Hz
  2.     100 Hz
  3.     60 Hz
  4.     50 Hz
 Discuss Question
Answer: Option D. ->  50 Hz
Question 40. Form factor for a sine wave is
  1.     1.414
  2.     0.707
  3.     1.11
  4.     0.637
 Discuss Question
Answer: Option C. ->  1.11

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