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MCQs

Total Questions : 327 | Page 2 of 33 pages
Question 11. 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 12. The form factor is the ratio of
  1.     Peak value to r.m.s. value
  2.     r.m.s. value to average value
  3.     Average value to r.m.s. value
  4.     None of the above
 Discuss Question
Answer: Option B. ->  r.m.s. value to average value
Question 13. 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
Question 14. 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 15. In an ac. circuit, a low value of kvar compared with kw indicates
  1.     Low efficiency
  2.     High power factor
  3.     Unity power factor
  4.     Maximum load current
 Discuss Question
Answer: Option B. ->  High power factor
Question 16. The r.m.s. value of half wave rectified sine wave is 200 v. the r.m.s. value of full wave rectified ac. will be
  1.     282.8 V
  2.     141.4 V
  3.     111 V
  4.     100 V
 Discuss Question
Answer: Option A. ->  282.8 V
Question 17. 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
Question 18. The phosphors for which of the following pair are 180° out of phase for vl, vc and vr?
  1.     VC and VR
  2.     VL and VR
  3.     VC and VL
  4.     None of the above
 Discuss Question
Answer: Option C. ->  VC and VL
Question 19. The r.m.s. value of pure cosine function is
  1.     0.5 of peak value
  2.     0.707 of peak value
  3.     Same as peak value
  4.     Zero
 Discuss Question
Answer: Option B. ->  0.707 of peak value
Question 20. If a sinusoidal wave has frequency of 50 hz with 30 a r.m.s. current which of the following equation represents this wave?
  1.     42.42 sin 314 t
  2.     60 sin 25 t
  3.     30 sin 50 t
  4.     84.84 sin 25 t
 Discuss Question
Answer: Option A. ->  42.42 sin 314 t

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