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MCQs

Total Questions : 327 | Page 7 of 33 pages
Question 61. 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 62. 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 63. For a sine wave with peak value imax the r.m.s. value is
  1.     0.5 Imax
  2.     0.707
  3.     0.9
  4.     1.414 Imax
 Discuss Question
Answer: Option B. ->  0.707
Question 64. 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 65. 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 66. 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 67. In a parallel r-c circuit, the current always _________the applied voltage
  1.     Lags
  2.     Leads
  3.     Remains in phase with
  4.     None of the above
 Discuss Question
Answer: Option B. ->  Leads
Question 68. Skin effect occurs when a conductor carries current at _________ frequencies.
  1.     Very low
  2.     Low
  3.     Medium
  4.     High
 Discuss Question
Answer: Option D. ->  High
Question 69. 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 70. 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

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