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MCQs

Total Questions : 109 | Page 6 of 11 pages
Question 51. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?
  1.    0°
  2.    45°
  3.    90°
  4.    180°
 Discuss Question
Answer: Option C. -> 90°
Question 52. Power factor of an inductive circuit is usually improved by connecting capacitor to it in
  1.    Parallel
  2.    Series
  3.    Either A or B
  4.    None of the above
 Discuss Question
Answer: Option A. -> Parallel
Question 53. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of
  1.    Iron loss in core
  2.    Skin effect
  3.    Increase in temperature
  4.    Capacitive effect between adjacent coil turns
 Discuss Question
Answer: Option A. -> Iron loss in core
Question 54. Which of the following circuit component opposes the change in the circuit voltage ?
  1.    Inductance
  2.    Capacitance
  3.    Conductance
  4.    Resistance
 Discuss Question
Answer: Option B. -> Capacitance
Question 55. In a sine wave the slope is constant
  1.    Between 0° and 90°
  2.    Between 90° and 180°
  3.    Between 180° and 270°
  4.    No where
 Discuss Question
Answer: Option D. -> No where
Question 56. For the same peak value, which of the following wave has the least mean value?
  1.    Half wave rectified sine wave
  2.    Triangular wave
  3.    Sine wave
  4.    Square wave
 Discuss Question
Answer: Option A. -> Half wave rectified sine wave
Question 57. For the same peak value which of the following wave will 'have the highest r.m.s. value?
  1.    Square wave
  2.    Half wave rectified sine wave
  3.    Triangular wave
  4.    Sine wave
 Discuss Question
Answer: Option A. -> Square wave
Question 58. In a R-L-C circuit
  1.    Power is consumed in resistance and is equal to IR
  2.    Exchange of power takes place between inductor and supply line
  3.    Exchange of power takes place between capacitor and supply line
  4.    All above are correct
 Discuss Question
Answer: Option D. -> All above are correct
Question 59. Power factor of the following circuit will be unity
  1.    Inductance
  2.    Capacitance
  3.    Resistance
  4.    Both A and B
 Discuss Question
Answer: Option C. -> Resistance
Question 60. The voltage of domestic supply is 220 V. This figure represents
  1.    Mean value
  2.    r.m.s. value
  3.    Peak value
  4.    Average value
 Discuss Question
Answer: Option B. -> r.m.s. value

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