Circuits and Circuit Theory MCQs with answers Page - 3

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Q. Form factor for a sine wave is

  • (A) 1.414
  • (B) 0.707
  • (C) 1.11
  • (D) 0.637

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Q. Form Factor is the ratio of

  • (A) average value/r.m.s. value
  • (B) average value/peak value
  • (C) r.m.s. value/average value
  • (D) r.m.s. value/peak value

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Q. If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?

  • (A) 42.42 sin 3141
  • (B) 60 sin 25 t
  • (C) 30 sin 50 t
  • (D) 84.84 sin 25 t

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Q. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be

  • (A) 0.001 s
  • (B) 0.1 s
  • (C) 10 s
  • (D) 100 s

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Q. If two sine waves of the same frequency have a phase difference of JT radians, then

  • (A) both will reach their minimum values at the same instant
  • (B) both will reach their maximum values at the same instant
  • (C) when one wave reaches its maxi¬mum value, the other will reach its minimum value
  • (D) none of the above

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Q. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

  • (A) a sinusoid of the same frequency
  • (B) a sinusoid of half the original frequency
  • (C) a sinusoid of double the frequency
  • (D) not a sinusoid

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Q. In a circuit containing R, L and C, power loss can take place in

  • (A) C only
  • (B) L only
  • (C) R only
  • (D) all of the above

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Q. In a highly capacitive circuit the

  • (A) apparent power is equal to the actual power
  • (B) reactive power is more than the apparent power
  • (C) reactive power is more than the actual power
  • (D) actual power is more than its reactive power

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Q. In a loss-free R-L-C circuit the transient current is

  • (A) oscillating
  • (B) square wave
  • (C) sinusoidal
  • (D) non-oscillating

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Q. In a parallel R-C circuit, the current always _________ the applied voltage

  • (A) lags
  • (B) leads
  • (C) remains in phase with
  • (D) none of the above

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