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MCQs

Total Questions : 109 | Page 11 of 11 pages
Question 101. In any A.C. circuit always
  1.    Apparent power is more than actual power
  2.    Reactive power is more than apparent power
  3.    Actual power is more than reactive power
  4.    Reactive power is more than actual power
 Discuss Question
Answer: Option A. -> Apparent power is more than actual power
Question 102. The transient currents are associated with the
  1.    Changes in the stored energy in the inductors and capacitors
  2.    Impedance of the circuit
  3.    Applied voltage to the circuit
  4.    Resistance of the circuit
 Discuss Question
Answer: Option A. -> Changes in the stored energy in the inductors and capacitors
Question 103. The inductance of a coil can be increased by
  1.    Increasing core length
  2.    Decreasing the number of turns
  3.    Decreasing the diameter of the former
  4.    Choosing core material having high relative permeability
 Discuss Question
Answer: Option D. -> Choosing core material having high relative permeability
Question 104. In the case of an unsymmetrical alternating current the average value must always be taken over
  1.    Unsymmetrical part of the wave form
  2.    The quarter cycle
  3.    The half cycle
  4.    The whole cycle
 Discuss Question
Answer: Option D. -> The whole cycle
Question 105. In a series resonant circuit, the impedance of the circuit is
  1.    Minimum
  2.    Maximum
  3.    Zero
  4.    None of the above
 Discuss Question
Answer: Option A. -> Minimum
Question 106. Power factor of the following circuit will be zero
  1.    Resistance
  2.    Inductance
  3.    Capacitance
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 107. The time constant of the capacitance circuit is defined as the time during which voltage
  1.    Falls to 36.8% of its final steady value
  2.    Rises to 38.6% of its final steady value
  3.    Rises to 63.2% of its final steady value
  4.    None of the above
 Discuss Question
Answer: Option C. -> Rises to 63.2% of its final steady value
Question 108. The square waveform of current has following relation between r.m.s. value and average value.
  1.    r.m.s. value is equal to average value
  2.    r.m.s. value of current is greater than average value
  3.    r.m.s. value of current is less than average value
  4.    None of the above
 Discuss Question
Answer: Option A. -> r.m.s. value is equal to average value
Question 109. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
  1.    A sinusoid of the same frequency
  2.    A sinusoid of half the original frequency
  3.    A sinusoid of double the frequency
  4.    Not a sinusoid
 Discuss Question
Answer: Option A. -> A sinusoid of the same frequency

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