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MCQs

Total Questions : 109 | Page 9 of 11 pages
Question 81. A sine wave has a frequency of 50 Hz. Its angular frequency is __________ radian/second.
  1.    100 n
  2.    50 jt
  3.    25 JT
  4.    5 n
 Discuss Question
Answer: Option A. -> 100 n
Question 82. 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 83. 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 84. Time constant of a capacitive circuit
  1.    Increases with the decrease of capacitance and decrease of resistance
  2.    Increases with the decrease of capacitance and increase of resistance
  3.    Increases with the increase of capacitance and decrease of resistance
  4.    Increase with increase of capacitance and increase of resistance
 Discuss Question
Answer: Option D. -> Increase with increase of capacitance and increase of resistance
Question 85. Capacitive reactance is more when
  1.    Capacitance is less and frequency of supply is less
  2.    Capacitance is less and frequency of supply is more
  3.    Capacitance is more and frequency of supply is less
  4.    Capacitance is more and frequency of supply is more
 Discuss Question
Answer: Option A. -> Capacitance is less and frequency of supply is less
Question 86. A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to
  1.    Average voltage
  2.    r.m.s. voltage
  3.    Peak voltage
  4.    None of the above
 Discuss Question
Answer: Option B. -> r.m.s. voltage
Question 87. The double energy transient occur in the
  1.    Purely inductive circuit
  2.    R-L circuit
  3.    R-C circuit
  4.    R-L-C circuit
 Discuss Question
Answer: Option D. -> R-L-C circuit
Question 88. In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value
  1.    Will change the maximum value of current at resonance
  2.    Will change the resonance frequency
  3.    Will change the impedance at resonance frequency
  4.    Will increase the selectivity of the circuit
 Discuss Question
Answer: Option D. -> Will increase the selectivity of the circuit
Question 89. Form Factor is the ratio of
  1.    Average value/r.m.s. value
  2.    Average value/peak value
  3.    r.m.s. value/average value
  4.    r.m.s. value/peak value
 Discuss Question
Answer: Option C. -> r.m.s. value/average value
Question 90. In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters?
  1.    220 V
  2.    220 v3 V
  3.    220/v3 V
  4.    None of the above
 Discuss Question
Answer: Option A. -> 220 V

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