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MCQs

Total Questions : 109 | Page 4 of 11 pages
Question 31. The r.m.s. value and mean value is the same in the case of
  1.    Triangular wave
  2.    Sine wave
  3.    Square wave
  4.    Half wave rectified sine wave
 Discuss Question
Answer: Option C. -> Square wave
Question 32. Power factor of the system is kept high
  1.    To reduce line losses
  2.    To maximize the utilization of the capacities of generators, lines and transformers
  3.    To reduce voltage regulation of the line
  4.    Due to all above reasons
 Discuss Question
Answer: Option D. -> Due to all above reasons
Question 33. For a frequency of 200 Hz, the time period will be
  1.    0.05 s
  2.    0.005 s
  3.    0.0005 s
  4.    0.5 s
 Discuss Question
Answer: Option B. -> 0.005 s
Question 34. All the rules and laws of D.C. circuit also apply to A.C. circuit containing
  1.    Capacitance only
  2.    Inductance only
  3.    Resistance only
  4.    All above
 Discuss Question
Answer: Option C. -> Resistance only
Question 35. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will
  1.    Be reduced by half
  2.    Be doubled
  3.    Be four times as high
  4.    Be reduced to one fourth
 Discuss Question
Answer: Option B. -> Be doubled
Question 36. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will
  1.    Be reduced by half
  2.    Be doubled
  3.    Be four times at high
  4.    Be reduced to one fourth
 Discuss Question
Answer: Option A. -> Be reduced by half
Question 37. A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to
  1.    The capacitive reactance in ohms
  2.    The current flowing in capacitor
  3.    The size of the capacitor being quite big
  4.    The statement is incorrect
 Discuss Question
Answer: Option D. -> The statement is incorrect
Question 38. The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that
  1.    Both waves must have same frequency
  2.    Both waves must have identical peak values
  3.    Both waves must have zero value at the same time
  4.    None of the above
 Discuss Question
Answer: Option A. -> Both waves must have same frequency
Question 39. Time constant of an inductive circuit
  1.    Increases with increase of inductance and decrease of resistance
  2.    Increases with the increase of inductance and the increase of resistance
  3.    Increases with the decrease of inductance and decrease of resistance
  4.    Increases with decrease of inductance and increase of resistance
 Discuss Question
Answer: Option A. -> Increases with increase of inductance and decrease of resistance
Question 40. Capacitive susceptance is a measure of
  1.    Reactive power in a circuit
  2.    The extent of neutralization of reactive power in a circuit
  3.    A purely capacitive circuit's ability to pass current
  4.    A purely capacitive circuit's ability to resist the flow of current
 Discuss Question
Answer: Option C. -> A purely capacitive circuit's ability to pass current

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