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MCQs

Total Questions : 327 | Page 9 of 33 pages
Question 81. Which of the following refers to a parallel circuit?
  1.     The current through each element is same
  2.     The voltage across element is in proportion to it's resistance value
  3.     The equivalent resistance is greater than any one of the resistors
  4.     The current through any one element is less than the source current
 Discuss Question
Answer: Option D. ->  The current through any one element is less than the source current
Question 82. The period of a sine wave is ___________ seconds. its frequency is
  1.     20 Hz
  2.     30 Hz
  3.     40 Hz
  4.     50 Hz
 Discuss Question
Answer: Option D. ->  50 Hz
Question 83. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of
  1.     Iron loss in core
  2.     Skin effect
  3.     Increase in temperature
  4.     Capacitive effect between adjacent coil turns
 Discuss Question
Answer: Option A. ->  Iron loss in core
Question 84. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?
  1.     0°
  2.     45°
  3.     90°
  4.     180°
 Discuss Question
Answer: Option C. ->  90°
Question 85. In r-l-c series resonant circuit magnitude of resonance frequency can be changed by changing the value of
  1.     R only
  2.     L only
  3.     C only
  4.     L or C
 Discuss Question
Answer: Option D. ->  L or C
Question 86. For the same peak value which of the following wave will 'have the highest r.m.s. value?
  1.     Square wave
  2.     Half wave rectified sine wave
  3.     Triangular wave
  4.     Sine wave
 Discuss Question
Answer: Option A. ->  Square wave
Question 87. Power factor of the following circuit will be unity
  1.     Inductance
  2.     Capacitance
  3.     Resistance
  4.     Both A and B
 Discuss Question
Answer: Option C. ->  Resistance
Question 88. The product of apparent power and cosine of the phase angle between circuit voltage and current is
  1.     True power
  2.     Reactive power
  3.     Volt-amperes
  4.     Instantaneous power
 Discuss Question
Answer: Option A. ->  True power
Question 89. Which of the following waves has the highest value of peak factor ?
  1.     Square wave
  2.     Sine wave
  3.     Half wave rectified sine wave
  4.     Triangular wave
 Discuss Question
Answer: Option C. ->  Half wave rectified sine wave
Question 90. The peak value of a sine wave is 200 v. its average value is
  1.     127.4 V
  2.     141.4 V
  3.     282.8 V
  4.     200 V
 Discuss Question
Answer: Option A. ->  127.4 V

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